If your OBD-II scanner displays P0084, your vehicle’s Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a malfunction in the Bank 2 exhaust valve control solenoid circuit.
The generic OBD-II definition for P0084 is:
Exhaust Valve Control Solenoid Circuit Bank 2
Depending on the manufacturer or scan tool, the description may appear as:
- Exhaust Valve Control Solenoid Circuit Bank 2
- Exhaust Valve Timing Control Solenoid Circuit Bank 2
- Exhaust Camshaft Control Solenoid Circuit Bank 2
- Exhaust Oil Control Valve Circuit Bank 2
- Exhaust VVT Solenoid Circuit Bank 2
- Exhaust Camshaft Actuator Circuit Bank 2
P0084 is the general electrical circuit code for the Bank 2 exhaust valve control solenoid. It belongs to the following code group:
- P0084: General circuit malfunction
- P0085: Circuit low
- P0086: Circuit high
This sequence is important because P0084 does not specify whether the circuit voltage is consistently high or low. It indicates that the PCM has detected a broader electrical fault involving the Bank 2 exhaust valve control solenoid.
The exhaust valve control solenoid is part of the engine’s variable valve timing system, commonly abbreviated VVT. It regulates engine-oil flow to the Bank 2 exhaust camshaft actuator or cam phaser, allowing the PCM to advance or retard exhaust valve timing.
Common P0084 causes include:
- Failed Bank 2 exhaust VVT solenoid
- Open or shorted solenoid coil
- Disconnected electrical connector
- Damaged engine wiring
- Corroded terminals
- Missing solenoid power supply
- Blown fuse or failed relay
- Poor PCM power or ground
- Failed PCM output driver
Possible symptoms include:
- Check Engine Light
- Rough or unstable idle
- Engine hesitation
- Poor acceleration
- Reduced engine power
- Increased fuel consumption
- Hard starting
- Engine stalling
- Increased exhaust emissions
- Failed emissions inspection
- No noticeable drivability symptoms
P0084 is generally a moderate-severity fault. The engine may continue running, but the PCM may disable Bank 2 exhaust camshaft adjustment and hold the camshaft in a default position until the electrical problem is repaired.
For additional diagnostic information, visit:
P0084 Quick Facts
| Item | Information |
|---|---|
| OBD-II Code | P0084 |
| Description | Exhaust Valve Control Solenoid Circuit Bank 2 |
| Category | Powertrain |
| System | Variable Valve Timing |
| Main Component | Exhaust Valve Control Solenoid |
| Affected Side | Bank 2 |
| Fault Type | General Electrical Circuit Malfunction |
| Severity | Moderate |
| Safe to Drive? | Sometimes, for a short distance |
| Typical Repair Cost | $100–700 |
What Does P0084 Mean?
P0084 means the PCM has detected abnormal electrical behavior in the circuit controlling the Bank 2 exhaust valve control solenoid.
The affected circuit may include:
- Exhaust valve control solenoid
- Solenoid power-supply circuit
- PCM control wire
- Electrical connector
- Shared fuse or relay
- Engine wiring harness
- PCM output driver
The PCM may store P0084 when it detects:
- An open circuit
- A short to ground
- A short to voltage
- Incorrect coil resistance
- Excessive circuit resistance
- Missing power supply
- Improper current draw
- Driver feedback that does not match the command
P0084 does not automatically prove the solenoid itself has failed.
The problem may be in the:
- Wiring
- Connector
- Fuse
- Relay
- Power supply
- Ground circuit
- PCM
Generic diagnostic references classify P0084 as a Bank 2 exhaust valve control solenoid circuit fault and list wiring, solenoid, oil-related and PCM problems among the possible causes.
What Is Bank 2?
Bank 2 is the side of the engine that does not contain cylinder number 1.
Bank 2 only exists on engines with more than one cylinder bank, such as:
- V6 engines
- V8 engines
- V10 engines
- V12 engines
- Horizontally opposed engines
Inline engines normally have only one bank and therefore should not use a Bank 2 designation for this circuit.
Bank 2 is not automatically:
- Driver side
- Passenger side
- Left side
- Right side
- Rear cylinder head
- Front cylinder head
The physical location depends on the manufacturer’s cylinder-numbering system.
Use:
- Factory service information
- Cylinder-numbering diagram
- Underhood emissions label
- Vehicle-specific repair manual
to identify Bank 2 correctly.
Replacing the easier-to-reach solenoid and hoping it belongs to Bank 2 is less diagnosis and more automotive roulette.
What Is an Exhaust Valve Control Solenoid?
The exhaust valve control solenoid is an electrically operated oil-control valve used by the variable valve timing system.
Depending on the manufacturer, it may also be called:
- Exhaust VVT solenoid
- Exhaust oil control valve
- Exhaust valve timing control solenoid
- Exhaust camshaft actuator solenoid
- Camshaft position actuator solenoid
- Variable cam timing solenoid
- VCT solenoid
- CVVT oil control valve
The solenoid controls pressurized engine oil flowing to the exhaust camshaft actuator.
By changing this oil flow, the PCM can advance or retard exhaust camshaft timing according to:
- Engine speed
- Engine load
- Throttle position
- Coolant temperature
- Oil temperature
- Vehicle speed
- Requested torque
- Emissions strategy
Exhaust camshaft timing can influence:
- Idle quality
- Low-speed torque
- High-RPM power
- Fuel economy
- Internal exhaust-gas recirculation
- Turbocharger response
- Exhaust emissions
P0084 indicates an electrical control problem. It does not automatically mean the camshaft actuator, timing chain or camshaft itself has failed.
How Variable Valve Timing Works
A typical variable valve timing system includes:
- Engine oil supply
- Oil passages inside the cylinder head
- Exhaust valve control solenoid
- Exhaust camshaft actuator or phaser
- Camshaft position sensor
- Crankshaft position sensor
- PCM control strategy
When the PCM requests an exhaust camshaft adjustment:
- It changes the electrical command sent to the solenoid.
- The solenoid redirects pressurized engine oil.
- Oil enters one side of the camshaft actuator.
- The actuator rotates the camshaft relative to its timing sprocket.
- The camshaft position sensor reports the new position.
- The PCM compares desired timing with actual timing.
If the electrical circuit fails, the PCM may no longer be able to control oil flow accurately.
It may then:
- Disable exhaust VVT
- Hold the camshaft in a default position
- Reduce engine output
- Store P0084
- Illuminate the Check Engine Light
How the Exhaust Valve Control Solenoid Circuit Works
Many exhaust VVT solenoids use two wires:
- Ignition or relay-supplied voltage
- PCM-controlled ground
The PCM may operate the solenoid using pulse-width modulation, or PWM.
PWM allows the PCM to regulate:
- Solenoid current
- Internal spool position
- Oil flow
- Camshaft actuator movement
The PCM may monitor:
- Circuit voltage
- Current draw
- Coil resistance
- Driver feedback
- Commanded duty cycle
- Actual camshaft position
A common low-side-controlled circuit works like this:
- The solenoid receives battery voltage.
- The PCM switches the other side toward ground.
- Current flows through the solenoid coil.
- The magnetic field moves the internal oil-control valve.
- Engine oil is redirected to the camshaft actuator.
If the electrical response does not match the PCM command, P0084 may be stored.
What Does “Circuit Malfunction” Mean?
A circuit malfunction means the PCM has detected an electrical problem but has not necessarily classified it as consistently high or low.
Possible electrical conditions include:
- Open solenoid coil
- Shorted solenoid coil
- Broken wiring
- Loose connector
- Corroded terminal
- Missing power supply
- Short to ground
- Short to battery voltage
- Excessive resistance
- Failed PCM driver
For comparison:
| Code | Description | Typical Meaning |
| P0084 | Exhaust Valve Control Solenoid Circuit Bank 2 | General electrical fault |
| P0085 | Exhaust Valve Control Solenoid Circuit Low Bank 2 | Voltage below expected range |
| P0086 | Exhaust Valve Control Solenoid Circuit High Bank 2 | Voltage above expected range |
P0084 is the broadest code in this group.
P0084 vs P0078
| Code | Affected Bank |
| P0078 | Exhaust Valve Control Solenoid Circuit Bank 1 |
| P0084 | Exhaust Valve Control Solenoid Circuit Bank 2 |
Both codes indicate a general electrical problem involving an exhaust valve control solenoid.
The difference is the affected cylinder bank.
If both codes are stored, inspect for a shared problem such as:
- Common actuator power supply
- Shared fuse
- Failed engine-control relay
- PCM power or ground problem
- Harness damage
- System-voltage issue
Two solenoids can fail simultaneously, but one shared electrical fault is usually more convincing.
P0084 vs P0023
P0023 is generally defined as:
“B” Camshaft Position Actuator Circuit Bank 2
P0084 is defined as:
Exhaust Valve Control Solenoid Circuit Bank 2
Depending on the manufacturer, both codes may involve the same Bank 2 exhaust oil-control solenoid.
The distinction may involve:
- Manufacturer terminology
- Circuit-monitoring strategy
- Specific camshaft actuator design
- Different OBD implementation
Always use the service information for the exact vehicle, engine and code.
P0084 vs P0085 vs P0086
P0084
P0084 means the PCM has detected a general electrical malfunction.
Possible causes include:
- Open circuit
- Short circuit
- Incorrect resistance
- Missing power
- Failed solenoid
- PCM driver fault
P0085
P0085 indicates that the circuit voltage or driver feedback is below specification.
Common diagnostic directions include:
- Short to ground
- Internally shorted solenoid
- Missing supply voltage
- Grounded PCM control wire
P0086
P0086 indicates that the circuit voltage is above specification.
Common diagnostic directions include:
- Open circuit
- Disconnected solenoid
- Broken wire
- Short to voltage
- Failed PCM driver
Symptoms of P0084
Possible symptoms include:
- Check Engine Light
- Rough idle
- Unstable idle speed
- Engine hesitation
- Poor throttle response
- Reduced acceleration
- Loss of low-end torque
- Reduced high-RPM power
- Increased fuel consumption
- Hard starting
- Extended cranking
- Engine stalling
- Misfires
- Increased exhaust emissions
- Failed emissions inspection
- Reduced-power mode
- No noticeable symptoms
Generic P0084 references commonly list reduced engine performance, increased fuel consumption and possible starting problems among the likely symptoms.
The severity depends on:
- Engine design
- Default exhaust camshaft position
- Whether the circuit fault is permanent
- Whether Bank 1 continues operating correctly
- Oil condition
- Mechanical condition of the cam phaser
- Whether additional timing codes are present
Can P0084 Cause a Rough Idle?
Yes.
Exhaust camshaft timing affects:
- Exhaust-gas scavenging
- Valve overlap
- Internal EGR
- Manifold vacuum
- Combustion stability
- Residual exhaust gas in the cylinders
If the Bank 2 exhaust camshaft becomes fixed in an unsuitable position, the engine may:
- Idle roughly
- Surge
- Misfire
- Stall
- Start poorly
However, rough idle can also be caused by:
- Vacuum leaks
- Ignition faults
- Fuel-delivery problems
- Low compression
- Mechanical timing errors
- Camshaft sensor faults
Confirm that P0084 is active before blaming every idle problem on the Bank 2 exhaust VVT solenoid.
Can P0084 Cause Poor Acceleration?
Yes.
Exhaust camshaft timing contributes to:
- Cylinder scavenging
- Volumetric efficiency
- Torque production
- High-RPM breathing
- Turbocharger response
When Bank 2 exhaust VVT is disabled, the engine may feel:
- Sluggish
- Flat at low RPM
- Weak in the midrange
- Less responsive at high RPM
- Slow to build boost
The engine may also feel uneven because Bank 1 and Bank 2 are no longer following the same timing strategy.
Can P0084 Cause Misfires?
P0084 may contribute to Bank 2 misfires if incorrect exhaust camshaft timing affects:
- Exhaust-gas evacuation
- Valve overlap
- Cylinder filling
- Combustion stability
- Residual gas volume
However, do not assume the VVT code caused every misfire.
Also inspect for:
- Spark-plug faults
- Ignition-coil failures
- Fuel-injector problems
- Vacuum leaks
- Low compression
- Mechanical timing errors
Misfires concentrated on Bank 2 may increase suspicion that the P0084 fault is affecting camshaft operation.
Common Causes of P0084
1. Failed Bank 2 Exhaust VVT Solenoid
The solenoid may fail electrically because of:
- Open coil
- Shorted coil
- Excessive resistance
- Internal terminal failure
- Heat damage
- Vibration
- Oil contamination
- Manufacturing defect
Generic P0084 references identify exhaust valve control solenoid failure as a common cause.
2. Open Solenoid Coil
The electrical winding inside the solenoid may break.
An open coil usually measures:
- Infinite resistance
- Extremely high resistance
- No continuity
The PCM may detect that the circuit does not draw current when commanded.
3. Shorted Solenoid Coil
The internal windings may short together.
This can cause:
- Resistance below specification
- Excessive current
- Blown fuse
- PCM driver protection
- P0084 or P0085
A shorted solenoid should be replaced.
Repeatedly installing a new fuse without testing the coil is simply allowing the fault to continue submitting the same complaint.
4. Disconnected Solenoid Connector
The connector may have been left unplugged during:
- Valve-cover replacement
- Intake manifold removal
- Timing-chain service
- Cylinder-head repair
- Engine replacement
- Oil-leak repairs
- Previous VVT diagnosis
A disconnected component creates an open circuit.
5. Loose Electrical Connector
A connector may appear attached but fail to maintain electrical contact because of:
- Broken locking tab
- Missing secondary lock
- Connector not fully seated
- Weak terminal contact
- Damaged housing
- Incorrect connector
6. Backed-Out Connector Terminal
A terminal may slide backward when the connector is installed.
Inspect for:
- Uneven pin depth
- Broken retaining tang
- Missing secondary lock
- Wire movement
- Terminal that sits deeper than the others
An apparently connected plug can still contain one completely disconnected circuit.
7. Corroded Connector Terminals
Corrosion can create:
- Excessive resistance
- Voltage drop
- Intermittent contact
- Incorrect PCM feedback
- Complete circuit failure
Inspect for:
- Green corrosion
- White oxidation
- Water
- Oil contamination
- Bent pins
- Spread terminals
- Damaged seals
8. Oil Inside the Connector
Engine oil may enter the connector because of:
- Failed solenoid seal
- Valve-cover leak
- Internal oil migration
- Contaminated harness
Oil can:
- Attract dirt
- Damage seals
- Reduce terminal contact
- Wick through the wiring harness
- Contribute to intermittent faults
Repair the source of the leak rather than repeatedly cleaning the connector.
9. Water Intrusion
Moisture may enter through:
- Damaged connector seal
- Broken connector body
- Unsealed wiring repair
- Pressure washing
- Coolant leak near the harness
Water can cause:
- Corrosion
- Terminal bridging
- Intermittent open circuits
- Incorrect resistance
10. Broken Wiring
The harness may break because of:
- Engine vibration
- Heat
- Harness tension
- Incorrect routing
- Rodent damage
- Previous repairs
- Connector strain
The conductor may break inside insulation that still looks normal.
11. Chafed Engine Harness
The harness may rub against:
- Valve-cover edge
- Cylinder-head casting
- Intake manifold support
- Engine bracket
- Wiring tray
- Metal retaining clip
A chafed wire may:
- Open
- Short to ground
- Short to voltage
- Fail intermittently as the engine moves
12. Heat-Damaged Wiring
Bank 2 exhaust-solenoid wiring may be routed near:
- Exhaust manifold
- Turbocharger
- EGR piping
- Cylinder head
- Hot coolant tubes
Heat can cause insulation to become:
- Brittle
- Cracked
- Melted
- Fused to adjacent wiring
13. Control Wire Shorted to Ground
A PCM-controlled wire may contact:
- Cylinder head
- Engine bracket
- Valve cover
- Ground wire
- Metal retaining clip
A short to ground may produce:
- Low circuit voltage
- Excessive current
- Blown fuse
- P0084 or P0085
14. Control Wire Shorted to Battery Voltage
The control wire may contact:
- Solenoid power feed
- Injector power
- Ignition-coil power
- Alternator wiring
- Battery-positive cable
- Incorrect accessory wiring
A short to voltage may produce:
- High circuit voltage
- Loss of PCM control
- P0084 or P0086
- PCM driver damage
15. Missing Solenoid Power Supply
The solenoid may receive power through:
- Engine-actuator fuse
- PCM relay
- Ignition relay
- Shared engine-control splice
A failed power source can create a general circuit fault.
If several actuator codes are stored, inspect shared power before replacing multiple components.
16. Blown Fuse
A fuse may blow because of:
- Shorted solenoid coil
- Power wire shorted to ground
- Melted harness
- Another actuator sharing the circuit
- Incorrect previous repair
Do not install a larger fuse.
The original fuse was not being overly cautious. It was preventing the harness from becoming a heating element.
17. Failed Engine-Control Relay
A failed relay may cause:
- Missing voltage
- Intermittent supply
- Excessive voltage drop
- Multiple actuator codes
Check whether the relay also powers:
- Bank 1 VVT solenoids
- Fuel injectors
- Ignition coils
- Other PCM-controlled actuators
18. Excessive Circuit Resistance
A wire may have continuity but still contain too much resistance to operate the solenoid properly.
Possible causes include:
- Corroded splice
- Partially broken conductor
- Weak crimp
- Loose terminal
- Heat-damaged connector
- Worn relay contact
Use voltage-drop testing under load rather than relying only on continuity.
19. Incorrect Replacement Connector
A replacement pigtail may have:
- Reversed wires
- Terminals installed in the wrong cavities
- Poor crimps
- Incorrect terminal type
- Unsealed splices
Always verify the pinout using the wiring diagram.
Matching wire colors is helpful only when everyone involved has agreed on the same colors.
20. Incorrect Replacement Solenoid
A replacement solenoid may have:
- Wrong resistance
- Incompatible connector
- Incorrect oil passages
- Different duty-cycle requirements
- Poor internal construction
A new part can still be:
- Incorrect
- Defective
- Counterfeit
- Cataloged for another engine
New packaging is not an electrical specification.
21. Low Engine Oil Level
Low oil does not normally cause the circuit fault directly.
However, the VVT system still depends on adequate oil pressure.
Low oil can cause:
- Slow camshaft response
- Cam phaser noise
- Solenoid sticking
- Additional timing codes
- Low oil pressure
Generic references for P0084 commonly include low oil level among the broader conditions that should be checked.
22. Dirty or Sludged Engine Oil
Contaminated oil may restrict:
- Solenoid spool movement
- Solenoid filter screen
- Cylinder-head oil passages
- Camshaft actuator movement
Dirty oil is more likely to cause timing-performance codes, but it may coexist with an electrical solenoid failure.
An oil change will not repair a broken control wire, but it may prevent the freshly repaired VVT circuit from discovering a second problem immediately afterward.
23. Incorrect Oil Viscosity
Oil that is too thick or too thin may cause:
- Delayed camshaft response
- Poor cold-start operation
- Low hot-idle oil pressure
- Cam phaser noise
- Timing-performance codes
Use the manufacturer-required:
- Oil viscosity
- Oil specification
- Filter type
24. Clogged Solenoid Screen
Some exhaust VVT solenoids contain a fine filter screen.
It may become restricted by:
- Sludge
- Varnish
- Metal particles
- Gasket debris
- Excessive silicone sealant
A clogged screen generally causes a hydraulic performance problem, but it should be inspected if camshaft response remains poor after the electrical fault is repaired.
25. Restricted Oil Passage
Oil passages inside the cylinder head may become blocked by:
- Sludge
- Varnish
- Sealant
- Metal debris
- Poor maintenance
This condition is more likely to cause:
- Over-advanced timing
- Over-retarded timing
- Slow camshaft response
- Camshaft correlation faults
P0084 should still be diagnosed electrically first.
26. Mechanically Stuck Camshaft Phaser
A stuck camshaft actuator may cause:
- Rough idle
- Rattling
- Poor performance
- Timing-performance codes
- Desired-versus-actual timing mismatch
A stuck phaser does not normally create the electrical circuit fault by itself.
Do not replace the cam phaser until the solenoid circuit has been tested.
27. Camshaft Position Sensor Fault
The camshaft position sensor provides feedback to the PCM.
A failing sensor may cause:
- Camshaft position codes
- Timing-correlation codes
- Hard starting
- Stalling
- Incorrect VVT feedback
It is not a common direct cause of P0084, but related codes may complicate diagnosis.
28. PCM Power or Ground Problem
A PCM power or ground issue may interfere with:
- Solenoid control
- Circuit monitoring
- Driver operation
- Diagnostic feedback
Inspect:
- Battery voltage
- PCM ignition supply
- PCM constant power
- PCM grounds
- Engine ground straps
- Body grounds
Multiple unrelated actuator codes increase the likelihood of a shared electrical problem.
29. PCM Software Issue
A calibration problem may cause the PCM to:
- Interpret driver feedback incorrectly
- Command the solenoid incorrectly
- Store P0084 prematurely
- Remain in failsafe mode
Check for:
- Technical service bulletins
- Calibration updates
- Reprogramming instructions
- Revised diagnostic procedures
30. Failed PCM Driver
The internal PCM driver may fail because of:
- Shorted solenoid
- Short to battery voltage
- Excessive current
- Water intrusion
- Internal electronic damage
Only suspect the PCM after confirming:
- Correct solenoid resistance
- Proper power supply
- Control-wire continuity
- No short to ground
- No short to voltage
- Connector integrity
- PCM powers and grounds
Replacing the PCM before checking the two-wire solenoid connector is a remarkably expensive method of discovering corrosion.
Is P0084 Serious?
P0084 is generally considered a moderate-severity code.
The engine may continue running, but Bank 2 exhaust camshaft adjustment may be:
- Disabled
- Fixed in a default position
- Unavailable under load
- Unable to follow PCM commands
Possible consequences include:
- Reduced engine performance
- Rough idle
- Poor fuel economy
- Increased emissions
- Hard starting
- Engine stalling
- Misfires
- Failed emissions inspection
P0084 becomes more serious if:
- Oil-pressure warning light is illuminated
- Engine oil is extremely low
- Engine rattles or knocks
- Vehicle stalls
- Misfires are severe
- Wiring is overheating
- Fuse repeatedly blows
- Multiple timing-correlation codes are stored
Can You Drive With P0084?
You may be able to drive a short distance if:
- Engine oil level is correct
- Oil-pressure warning light is off
- Engine runs reasonably smoothly
- No severe mechanical noise is present
- Acceleration remains safe
- Wiring is not overheating
Avoid continued driving if:
- Oil-pressure warning is illuminated
- Engine rattles
- Vehicle stalls repeatedly
- Power is severely reduced
- Wiring smells burned
- Bank 2 misfires are severe
- Timing-correlation codes are present
- Engine will not start reliably
P0084 usually does not cause immediate internal engine damage by itself.
Driving with low oil pressure, severe timing noise or a harness that is actively overheating is another matter entirely.
How to Diagnose P0084
Step 1: Scan All Stored Codes
Check for:
- P0084
- P0085
- P0086
- P0078
- P0079
- P0080
- P0023
- P0024
- P0025
- P0019
- Camshaft position codes
- Crankshaft position codes
- Misfire codes
- Oil-pressure codes
- System-voltage codes
Record:
- Freeze-frame data
- Pending codes
- Permanent codes
- Engine RPM
- Battery voltage
- Oil temperature
- Exhaust VVT command
- Desired Bank 2 exhaust-camshaft angle
- Actual Bank 2 exhaust-camshaft angle
Do not clear the codes before recording diagnostic data.
Step 2: Confirm the Correct Definition
Verify that the scanner identifies P0084 as:
Exhaust Valve Control Solenoid Circuit Bank 2
P0084 is the general circuit code. P0085 is circuit low, and P0086 is circuit high.
Step 3: Identify Bank 2
Locate:
- Cylinder number 1
- Bank 1
- Opposite cylinder bank
- Bank 2 exhaust camshaft
- Correct Bank 2 exhaust VVT solenoid
Do not confuse:
- Bank 2 with Bank 1
- Intake solenoid with exhaust solenoid
- VVT solenoid with camshaft position sensor
- Oil-pressure switch with oil-control valve
Step 4: Check Engine Oil Level
Park the vehicle on level ground and verify:
- Oil level
- Oil condition
- Correct viscosity
- Signs of leakage
- Oil-pressure warning-light behavior
Correct oil problems before performing active VVT tests.
Step 5: Inspect Oil Condition
Check for:
- Sludge
- Varnish
- Fuel dilution
- Coolant contamination
- Metal debris
- Incorrect viscosity
- Excessively long service interval
Perform an oil and filter change if necessary, but continue electrical diagnosis because P0084 is a circuit code.
Step 6: Locate the Bank 2 Exhaust Solenoid
The solenoid may be mounted:
- In the cylinder head
- Near the valve cover
- Near the timing cover
- At the front or rear of the cylinder head
- Beneath an engine cover
- Near the Bank 2 exhaust camshaft oil passage
Use service information to identify the correct component.
Step 7: Confirm the Connector Is Attached
Check whether the connector is:
- Installed
- Fully seated
- Locked
- Attached to the correct solenoid
- Free of broken locking tabs
An unplugged component should always be ruled out before advanced testing.
Step 8: Inspect the Connector
Disconnect the connector and inspect for:
- Bent pins
- Corrosion
- Oil contamination
- Water intrusion
- Backed-out terminals
- Spread terminals
- Heat damage
- Damaged seals
Repair connector damage before replacing the solenoid.
Step 9: Inspect the Wiring Harness
Follow the harness toward the PCM and power-distribution system.
Look for:
- Broken wires
- Chafed insulation
- Melted sections
- Pinched wiring
- Rodent damage
- Poor splices
- Contact with hot components
- Missing retainers
- Harness tension
Step 10: Check Fuses and Relays
Identify any fuse or relay supplying:
- Bank 2 exhaust solenoid
- Both exhaust solenoids
- All VVT solenoids
- Engine actuators
If the fuse is blown:
- Disconnect the solenoid.
- Measure solenoid resistance.
- Check the supply wire for a short.
- Inspect other components sharing the fuse.
- Repair the fault.
- Install the correct fuse.
- Retest the circuit.
Step 11: Measure Solenoid Resistance
Measure resistance across the disconnected solenoid terminals.
Compare it with the manufacturer’s specification.
Possible findings include:
- Infinite resistance: open coil
- Excessively high resistance: damaged coil
- Very low resistance: shorted coil
- Correct resistance: continue circuit testing
Do not use a generic resistance value from another engine.
Step 12: Compare Bank 1 and Bank 2
If both exhaust solenoids are identical, compare:
- Coil resistance
- Supply voltage
- Connector condition
- Current draw
- Control waveform
A significant difference may help isolate the faulty component.
Confirm matching part numbers before using Bank 1 as the reference.
Step 13: Test Each Terminal Against the Housing
When permitted by service information, measure resistance between each solenoid terminal and the solenoid body.
Unexpected continuity may indicate:
- Internal short
- Coil-insulation failure
- Internal contamination
Step 14: Verify Supply Voltage
With ignition on, identify the solenoid power terminal.
Expected voltage may be:
- Battery voltage
- Ignition voltage
- Relay-controlled voltage
- PCM-controlled voltage
If voltage is missing, inspect:
- Fuse
- Relay
- Power wire
- Shared splice
- Connector terminal
Step 15: Load-Test the Supply Circuit
An unloaded multimeter may show normal voltage through a heavily corroded circuit.
Perform an approved loaded test across:
- Fuse
- Relay contacts
- Power wire
- Shared splice
- Connector terminal
Voltage that collapses under load indicates excessive resistance.
Step 16: Test the PCM Control Wire
Disconnect the PCM and solenoid as instructed.
Check the wire for:
- Continuity
- Excessive resistance
- Open circuit
- Short to ground
- Short to voltage
- Short to another actuator circuit
Move the harness during testing.
Step 17: Check Terminal Tension
Use the manufacturer-approved terminal test tool.
Inspect for:
- Spread terminal
- Weak contact
- Backed-out pin
- Broken retaining tang
- Incorrect replacement terminal
Avoid forcing oversized meter probes into the connector.
Creating the terminal fault during diagnosis is efficient, but not in a useful way.
Step 18: Perform Voltage-Drop Testing
With the circuit operating, measure voltage drop across:
- Power-supply wire
- Fuse
- Relay contacts
- Solenoid connector
- PCM control wire
- PCM grounds
Excessive voltage drop indicates unwanted resistance.
Step 19: Command the Solenoid With a Scan Tool
Use a bidirectional scan tool when supported.
Monitor:
- Bank 2 exhaust-solenoid command
- Duty cycle
- Control voltage
- Current draw
- Desired Bank 2 exhaust-camshaft angle
- Actual Bank 2 exhaust-camshaft angle
- Engine idle speed
Possible results include:
- No current: open circuit or missing supply
- Excessive current: shorted solenoid or wiring
- Electrical response but no camshaft movement: hydraulic or mechanical problem
- Normal response: intermittent fault or stored history code
Step 20: Measure Solenoid Current
A low-current clamp may reveal:
- Zero current: open circuit
- Low current: excessive resistance
- Excessive current: shorted coil
- Intermittent current: loose connection
Compare the reading with:
- Manufacturer specification
- Bank 1 exhaust solenoid
- Known-good vehicle
Step 21: Examine the PWM Waveform
An oscilloscope can display:
- Duty cycle
- Voltage amplitude
- PCM switching
- Current ramp
- Driver shutdown
- Intermittent dropouts
A waveform that does not respond correctly may indicate:
- Open circuit
- Short circuit
- Failed solenoid
- Failed PCM driver
Step 22: Perform a Wiggle Test
Monitor voltage and current while moving:
- Solenoid connector
- Harness near the valve cover
- Wiring near the exhaust manifold
- Fuse-box connectors
- PCM connector
- Previous repair areas
Watch for:
- Voltage changes
- Current appearing or disappearing
- Code status changes
- Idle changes
- Camshaft response returning
Step 23: Inspect the Solenoid Mechanically
If the electrical circuit passes but camshaft response remains poor, remove the solenoid.
Inspect for:
- Sludge
- Varnish
- Metal debris
- Damaged filter screen
- Stuck spool valve
- Broken O-ring
- Excessive silicone sealant
Mechanical restrictions normally produce timing-performance codes, but they may exist alongside P0084.
Step 24: Compare Desired and Actual Camshaft Timing
Monitor:
- Desired Bank 2 exhaust-camshaft angle
- Actual Bank 2 exhaust-camshaft angle
- VVT duty cycle
- Engine speed
- Engine load
- Oil temperature
Possible findings include:
- No electrical command: circuit or PCM problem
- Command present but no movement: hydraulic or mechanical problem
- Bank 2 differs greatly from Bank 1: bank-specific fault
- Both banks fail: shared oil, power or PCM issue
Step 25: Swap Solenoids Only When Approved
If the Bank 1 and Bank 2 exhaust solenoids are confirmed identical, a controlled swap may help isolate the fault.
After swapping:
- Code moves to Bank 1: solenoid likely faulty
- P0084 remains on Bank 2: wiring or PCM circuit likely faulty
Do not swap intake and exhaust solenoids unless the manufacturer confirms they are interchangeable.
Step 26: Check Oil Pressure
If electrical testing passes but timing response remains poor, verify engine-oil pressure.
Low pressure may result from:
- Low oil level
- Worn oil pump
- Restricted pickup tube
- Excessive engine wear
- Incorrect oil viscosity
- Internal oil leakage
The camshaft actuator cannot respond properly without adequate oil pressure.
Step 27: Check PCM Power and Grounds
Before condemning the PCM, verify:
- Constant battery power
- Ignition power
- PCM grounds
- Connector condition
- Terminal tension
- Water intrusion
- Charging-system voltage
Step 28: Check Technical Service Bulletins
Search current manufacturer information using:
- VIN
- Model year
- Engine code
- P0084
- Solenoid part number
- PCM calibration number
- Related trouble codes
Possible factory corrections may include:
- Updated solenoid
- Revised wiring
- Connector repair
- Harness relocation
- PCM software update
- Revised diagnostic procedure
Step 29: Evaluate the PCM Driver
Only consider PCM failure after confirming:
- Solenoid resistance is correct
- Supply voltage is correct
- Control wire has continuity
- No short to ground exists
- No short to voltage exists
- Connector terminals are secure
- PCM powers and grounds are correct
- Software is current
If the PCM cannot control the circuit after all external tests pass, it may require:
- Software update
- Module repair
- Replacement and programming
Step 30: Verify the Repair
After completing repairs:
- Clear all diagnostic trouble codes.
- Start the engine.
- Confirm the oil-pressure warning light turns off normally.
- Monitor the Bank 2 exhaust-solenoid command.
- Check circuit voltage and current.
- Compare desired and actual exhaust-camshaft timing.
- Verify normal idle quality.
- Road-test under varied load and RPM.
- Complete the required drive cycle.
- Rescan for pending and confirmed codes.
- Confirm P0084 does not return.
Common Repairs and Costs
| Repair | Estimated Cost |
| Reconnect or reseat solenoid connector | $0–100 |
| Clean electrical connector | $50–150 |
| Replace connector terminals | $75–250 |
| Engine oil and filter change | $60–180 |
| Replace Bank 2 exhaust VVT solenoid | $150–500 |
| Repair open or shorted wiring | $150–650 |
| Replace solenoid connector | $100–325 |
| Replace fuse or relay after repairing fault | $75–250 |
| Repair engine power-supply circuit | $150–700 |
| Clean restricted oil passage | $200–700 |
| Replace exhaust camshaft actuator or phaser | $700–2,000+ |
| Replace timing-chain components | $1,000–4,000+ |
| Update PCM software | $100–300 |
| Replace and program PCM | $1,000–2,500+ |
Actual costs depend on:
- Vehicle design
- Solenoid accessibility
- Wiring location
- Labor rate
- Oil contamination
- Additional timing faults
- Module-programming requirements
A loose connector may take seconds to repair.
A damaged wire beneath the intake manifold may turn those seconds into several hours and a growing pile of parts that had nothing wrong with them.
Common Diagnostic Mistakes
Avoid these common P0084 diagnostic mistakes:
- Confusing P0084 with P0085 or P0086
- Calling P0084 a circuit-high code
- Misidentifying Bank 2
- Confusing intake and exhaust solenoids
- Replacing the solenoid without testing the circuit
- Ignoring engine oil level
- Ignoring a shared fuse or relay
- Checking only continuity
- Failing to perform voltage-drop tests
- Using generic solenoid resistance values
- Replacing the cam phaser before testing the wiring
- Replacing the PCM before inspecting connector terminals
- Assuming a new aftermarket solenoid must be good
- Ignoring multiple actuator codes
- Failing to verify the repair with active scan-tool testing
P0084 is a general electrical circuit code.
The timing chain may eventually need replacement, but replacing it because one connector is corroded is an expensive disagreement with the evidence.
Vehicles Commonly Affected
P0084 is a generic OBD-II code and may appear on certain:
- Nissan vehicles
- Infiniti vehicles
- Hyundai vehicles
- Kia vehicles
- Toyota vehicles
- Lexus vehicles
- Ford vehicles
- Lincoln vehicles
- Chevrolet vehicles
- GMC vehicles
- Cadillac models
- Dodge vehicles
- Jeep models
- Chrysler vehicles
- Mazda vehicles
- Mitsubishi vehicles
- Subaru vehicles
Manufacturer terminology may include:
- Exhaust oil control valve
- Exhaust valve timing control solenoid
- Exhaust VVT solenoid
- VCT solenoid
- Exhaust camshaft actuator solenoid
- CVVT oil control valve
The exact wiring, voltage thresholds and diagnostic procedures vary by application.
P0084 on Nissan and Infiniti Vehicles
Nissan and Infiniti may refer to the component as the:
Exhaust Valve Timing Control Solenoid Valve
Possible causes include:
- Failed Bank 2 exhaust solenoid
- Open or shorted coil
- Disconnected connector
- Broken ECM control wire
- Corroded terminal
- Missing power supply
- ECM driver fault
A documented Nissan-related P0084 complaint identifies the code as the Bank 2 exhaust valve control solenoid circuit.
If additional timing-performance codes are stored, inspect:
- Engine oil condition
- Oil pressure
- Solenoid screen
- Camshaft actuator
- Timing-chain condition
P0084 on Hyundai and Kia Vehicles
Hyundai and Kia may call the component the:
- Exhaust oil control valve
- Exhaust CVVT oil control valve
- Exhaust valve control solenoid
Inspect:
- Solenoid coil resistance
- Connector condition
- Wiring near the cylinder head
- Shared actuator power
- PCM control wire
- Engine oil level and condition
Related Hyundai and Kia VVT circuits commonly use PCM-controlled oil-control valves and are diagnosed through circuit, resistance, supply and control-wire testing.
P0084 on Toyota and Lexus Vehicles
Toyota and Lexus may call the component the:
- Exhaust oil control valve
- Camshaft timing oil control valve
- VVT control solenoid
Possible inspection areas include:
- Bank 2 exhaust oil control valve
- Harness near the cylinder head
- Shared actuator power supply
- Connector terminal tension
- PCM control circuit
- Oil-control-valve filter
Confirm the Bank 2 location using the exact engine family.
P0084 on Ford and Lincoln Vehicles
Ford and Lincoln may use the term:
- Exhaust VCT solenoid
- Variable camshaft timing solenoid
- Exhaust camshaft actuator solenoid
Possible causes include:
- Failed Bank 2 exhaust VCT solenoid
- Connector damage
- Harness chafing
- Missing actuator power supply
- PCM control fault
- Incorrect oil viscosity
If multiple VCT circuit codes are present, inspect the shared power source and harness.
P0084 on General Motors Vehicles
General Motors may call the component the:
- Exhaust camshaft position actuator solenoid
- Camshaft actuator solenoid valve
Possible causes include:
- Failed solenoid coil
- Loose engine-harness connector
- Damaged ignition-voltage feed
- Shorted control circuit
- Incorrect solenoid
- ECM driver failure
If several actuator codes are stored, inspect the common ignition-voltage circuit before replacing multiple solenoids.
P0084 After Engine Repairs
If P0084 appears after:
- Valve-cover replacement
- Cylinder-head repair
- Timing-chain service
- Engine replacement
- Intake manifold removal
- Solenoid replacement
inspect for:
- Solenoid connector left unplugged
- Connector attached to the wrong component
- Harness pinched beneath a bracket
- Terminal pulled from the connector
- Incorrect solenoid installed
- Replacement pigtail wired incorrectly
- PCM connector not fully locked
A code appearing immediately after repair work should first be investigated in the area that was disturbed.
The PCM may be able to adjust cam timing continuously, but it still cannot reconnect the plug left hanging beside the valve cover.
P0084 After Replacing the VVT Solenoid
If P0084 appears after installing a new solenoid, verify:
- Correct part number
- Correct Bank 2 location
- Correct exhaust position
- Connector fully seated
- Terminal alignment
- Coil resistance
- Pigtail wiring
- Solenoid pin condition
A replacement component may still be:
- Defective
- Incorrect
- Electrically incompatible
- Installed on the wrong bank
- Installed in the intake position
Do not condemn the PCM merely because the new part arrived in a clean box.
Can Dirty Oil Cause P0084?
Dirty oil can contribute to VVT problems, but P0084 specifically directs diagnosis toward the electrical circuit.
Dirty oil may cause:
- Solenoid spool sticking
- Restricted oil screen
- Slow camshaft response
- Cam phaser noise
- P0024 or P0025
Dirty oil does not directly explain:
- Disconnected connector
- Broken wire
- Short to voltage
- Failed fuse
- Open solenoid coil
Check oil condition, but continue electrical diagnosis.
Can Low Oil Cause P0084?
Low oil is not normally the direct cause of the electrical circuit code.
However, low oil can cause:
- Poor VVT response
- Cam phaser noise
- Additional timing codes
- Low oil pressure
- Solenoid sticking
Correct the oil level before active testing, but do not assume adding oil will repair damaged wiring.
Can a Bad VVT Solenoid Cause P0084?
Yes.
A failed exhaust VVT solenoid can cause P0084 if its coil is:
- Open
- Shorted
- Excessively resistive
- Intermittently disconnected
- Shorted to the housing
Measure coil resistance and compare it with the manufacturer’s specification.
Can a Bad Camshaft Sensor Cause P0084?
A camshaft position sensor is not a common direct cause of P0084.
The camshaft sensor reports position, while P0084 monitors the exhaust valve control solenoid circuit.
A failed camshaft sensor is more likely to set:
- Camshaft position sensor code
- Camshaft correlation code
- VVT performance code
- Starting or stalling complaint
Diagnose all stored codes together.
Can a Blown Fuse Cause P0084?
Yes, depending on the circuit design.
A blown fuse may remove power from:
- Bank 2 exhaust solenoid
- Both exhaust solenoids
- Multiple VVT solenoids
- Other engine actuators
If several circuit codes appear together, inspect shared fuses and relays before replacing individual components.
Find the cause before installing another fuse.
A fuse is not a consumable service item. It is a circuit-protection device with strong opinions about excessive current.
How to Prevent P0084
Reduce the likelihood of P0084 by:
- Maintaining the correct engine-oil level
- Using the correct oil viscosity
- Following recommended oil-change intervals
- Repairing oil leaks promptly
- Keeping VVT connectors clean and dry
- Replacing damaged connector seals
- Reinstalling engine-harness retainers
- Keeping wiring away from excessive heat
- Inspecting wiring after engine repairs
- Using OEM-quality VVT solenoids
- Avoiding oversized electrical test probes
- Repairing damaged wiring promptly
Frequently Asked Questions
What does P0084 mean?
P0084 means the PCM has detected an electrical malfunction in the Bank 2 exhaust valve control solenoid circuit.
What is the full definition of P0084?
The generic definition is:
Exhaust Valve Control Solenoid Circuit Bank 2
Is P0084 a circuit-low or circuit-high code?
Neither specifically.
P0084 is the general circuit-malfunction code.
- P0085 is circuit low.
- P0086 is circuit high.
Where is Bank 2?
Bank 2 is the side of the engine that does not contain cylinder number 1.
The exact side varies by engine design.
What causes P0084 most often?
Common causes include:
- Failed exhaust VVT solenoid
- Disconnected connector
- Open or shorted wiring
- Corroded terminals
- Missing power supply
- Blown fuse
- Failed relay
- PCM driver fault
Is P0084 serious?
P0084 is moderately serious.
The engine may continue running, but performance, idle quality, fuel economy and emissions may be affected.
Can I drive with P0084?
Possibly for a short distance if:
- Oil pressure is normal
- Engine runs reasonably smoothly
- No severe timing noise is present
- Power loss is mild
Stop driving if the oil-pressure warning appears, the engine rattles, it stalls or power loss becomes severe.
Can P0084 cause rough idle?
Yes.
Loss of Bank 2 exhaust camshaft control may cause rough idle, surging, misfires or stalling.
Can P0084 cause poor acceleration?
Yes.
The engine may lose torque and throttle response if Bank 2 exhaust camshaft timing cannot be adjusted.
Can P0084 cause Bank 2 misfires?
It may contribute to Bank 2 misfires if incorrect exhaust timing affects cylinder scavenging and combustion stability.
Ignition, fuel and compression problems must still be ruled out.
Can an unplugged VVT solenoid cause P0084?
Yes.
A disconnected solenoid creates an open circuit and may store P0084 or P0086, depending on manufacturer logic.
Can broken wiring cause P0084?
Yes.
An open, grounded or shorted wire can all trigger P0084.
Can dirty oil cause P0084?
Dirty oil can contribute to hydraulic VVT problems, but electrical testing is required because P0084 is a circuit code.
What is the difference between P0078 and P0084?
P0078 affects the Bank 1 exhaust valve control solenoid circuit.
P0084 affects the Bank 2 circuit.
What is the difference between P0084 and P0085?
P0084 indicates a general circuit fault.
P0085 specifically indicates that circuit voltage is below specification.
What is the difference between P0084 and P0086?
P0084 indicates a general circuit fault.
P0086 specifically indicates that circuit voltage is above specification.
Can I test the VVT solenoid with a multimeter?
Yes.
Common tests include:
- Coil resistance
- Short to housing
- Supply voltage
- Control-wire continuity
- Short to ground
- Short to battery voltage
- Voltage drop
Use vehicle-specific specifications.
Can I apply battery voltage directly to the solenoid?
Only if the manufacturer’s test procedure permits it.
Incorrect polarity, continuous power or excessive current may damage the solenoid or PCM circuit.
Does a replacement VVT solenoid require programming?
Usually not.
The vehicle may require:
- Code clearing
- Drive cycle
- Camshaft relearn
- Oil service
- PCM adaptation
A replacement PCM requires programming.
How much does P0084 cost to repair?
A basic Bank 2 exhaust VVT solenoid replacement typically costs approximately $150–500.
Wiring, connector, PCM, camshaft actuator or timing-system repairs may cost substantially more.
Final Thoughts
The P0084 code means the PCM has detected a malfunction in the Bank 2 exhaust valve control solenoid circuit.
The most common causes include:
- Failed Bank 2 exhaust VVT solenoid
- Open or shorted solenoid coil
- Disconnected connector
- Broken wiring
- Corroded terminals
- Missing power supply
- Blown fuse or failed relay
- Short to ground
- Short to voltage
- Failed PCM driver
Start diagnosis by:
- Confirming P0084 is the general Bank 2 circuit code.
- Scanning for related trouble codes.
- Correctly identifying Bank 2.
- Checking engine-oil level and condition.
- Confirming the exhaust solenoid is connected.
- Inspecting connector terminals.
- Measuring solenoid resistance.
- Checking fuses and relays.
- Verifying supply voltage.
- Testing the PCM control wire.
- Checking for shorts to ground or voltage.
- Comparing Bank 1 and Bank 2 circuits.
- Commanding the solenoid with a bidirectional scan tool.
- Evaluating the PCM only after external circuit tests pass.
Do not automatically replace the camshaft actuator or timing chain.
P0084 is first and foremost an electrical circuit code. The repair may involve a failed solenoid, corroded connector, broken wire, blown fuse, failed relay or PCM driver.
Variable valve timing is a sophisticated combination of electronics, hydraulics and mechanical camshaft control.
Sometimes the entire system still stops working because one connector was not fully clicked into place—which is the sort of humble little failure that keeps expensive engineering from getting too confident.
Related Articles
Exhaust Valve Control Solenoid Codes
- P0078 Code Explained: Exhaust Valve Control Solenoid Circuit Bank 1
- P0079 Code Explained: Exhaust Valve Control Solenoid Circuit Low Bank 1
- P0080 Code Explained: Exhaust Valve Control Solenoid Circuit High Bank 1
- P0085 Code Explained: Exhaust Valve Control Solenoid Circuit Low Bank 2
- P0086 Code Explained: Exhaust Valve Control Solenoid Circuit High Bank 2
Related Bank 2 Camshaft Codes
- P0023 Code Explained: “B” Camshaft Position Actuator Circuit Bank 2
- P0024 Code Explained: “B” Camshaft Timing Over-Advanced Bank 2
- P0025 Code Explained: “B” Camshaft Timing Over-Retarded Bank 2
- P0019 Code Explained: Crankshaft–Camshaft Correlation Bank 2 Sensor B
Previous P-Code Articles
- P0081 Code Explained: Intake Valve Control Solenoid Circuit Bank 2
- P0082 Code Explained: Intake Valve Control Solenoid Circuit Low Bank 2
- P0083 Code Explained: Intake Valve Control Solenoid Circuit High Bank 2
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