If your OBD-II scanner displays P0080, your vehicle’s Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a higher-than-expected electrical signal in the Bank 1 exhaust valve control solenoid circuit.
The generic OBD-II definition for P0080 is:
Exhaust Valve Control Solenoid Circuit High Bank 1
Depending on the manufacturer or scan tool, the description may appear as:
- Exhaust Valve Control Solenoid Circuit High Bank 1
- Exhaust Valve Timing Control Solenoid Circuit High Bank 1
- Exhaust Camshaft Control Solenoid Circuit High Bank 1
- Exhaust Oil Control Valve Circuit High Bank 1
- Exhaust VVT Solenoid Circuit High Bank 1
- Exhaust Valve Control Solenoid Open or Short to Voltage Bank 1
P0080 belongs to the Bank 1 exhaust valve control solenoid code group:
- P0078: General circuit malfunction
- P0079: Circuit low
- P0080: Circuit high
The code sequence confirms that P0080 identifies the circuit-high fault for the Bank 1 exhaust valve control solenoid.
The exhaust valve control solenoid is part of the engine’s variable valve timing system. It directs pressurized engine oil to the exhaust camshaft actuator, allowing the PCM to advance or retard exhaust camshaft timing.
P0080 is primarily an electrical code. It commonly indicates that the circuit is:
- Open
- Disconnected
- Shorted to battery voltage
- Excessively resistant
- Not being pulled low by the PCM driver
Common causes include:
- Disconnected exhaust VVT solenoid
- Open solenoid coil
- Broken control wire
- Corroded connector terminals
- Control circuit shorted to voltage
- Incorrect replacement solenoid
- Failed PCM driver
Possible symptoms include:
- Check Engine Light
- Rough idle
- Poor acceleration
- Reduced engine power
- Increased fuel consumption
- Hard starting
- Engine stalling
- Increased emissions
- Failed emissions inspection
- No noticeable drivability symptoms
For additional diagnostic information, visit:
P0080 Quick Facts
| Item | Information |
|---|---|
| OBD-II Code | P0080 |
| Description | Exhaust Valve Control Solenoid Circuit High Bank 1 |
| Category | Powertrain |
| System | Variable Valve Timing |
| Main Component | Exhaust Valve Control Solenoid |
| Affected Side | Bank 1 |
| Fault Type | High Circuit Voltage |
| Common Electrical Cause | Open Circuit or Short to Voltage |
| Severity | Moderate |
| Safe to Drive? | Sometimes, for a short distance |
| Typical Repair Cost | $100–700 |
What Does P0080 Mean?
P0080 means the PCM has detected voltage or electrical feedback above the permitted range in the Bank 1 exhaust valve control solenoid circuit.
The affected circuit may include:
- Exhaust valve control solenoid
- Solenoid power-supply wire
- PCM-controlled ground wire
- Electrical connector
- Fuse or engine-control relay
- Engine wiring harness
- PCM output driver
On many vehicles, the solenoid receives ignition voltage on one terminal. The PCM controls the other terminal by switching it to ground.
If the PCM commands the solenoid on but the control circuit remains near battery voltage, it may conclude that current cannot flow because of:
- An open solenoid coil
- A disconnected connector
- A broken wire
- Excessive circuit resistance
- A short to battery voltage
- A failed PCM driver
The PCM may then disable variable valve timing and store P0080.
Important P0078, P0079 and P0080 Code Sequence
The correct generic sequence is:
| Code | Description |
| P0078 | Exhaust Valve Control Solenoid Circuit Bank 1 |
| P0079 | Exhaust Valve Control Solenoid Circuit Low Bank 1 |
| P0080 | Exhaust Valve Control Solenoid Circuit High Bank 1 |
Therefore:
- P0078 is the general circuit code.
- P0079 indicates a low electrical condition.
- P0080 indicates a high electrical condition.
This distinction is important because the diagnostic direction changes:
- A circuit-low code commonly leads toward a short to ground or shorted coil.
- A circuit-high code commonly leads toward an open circuit, disconnected component, or short to voltage.
Exact manufacturer circuit designs vary, so always verify the vehicle’s wiring diagram.
What Is Bank 1?
Bank 1 is the side of the engine containing cylinder number 1.
On inline engines, there is only one cylinder bank, so the entire engine is considered Bank 1.
On V-type engines, including:
- V6
- V8
- V10
- V12
Bank 1 may be located on either side.
It is not automatically:
- Driver side
- Passenger side
- Left side
- Right side
- Front side
Use the manufacturer’s cylinder-numbering diagram to identify Bank 1.
Replacing the solenoid on the wrong bank will not clear P0080, although it may provide a detailed education in removing the same engine cover twice.
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.
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 oil flowing to the exhaust camshaft actuator or cam phaser.
The PCM may adjust exhaust camshaft timing based on:
- Engine speed
- Engine load
- Throttle position
- Coolant temperature
- Oil temperature
- Vehicle speed
- Requested torque
- Emissions requirements
Adjusting exhaust camshaft timing can improve:
- Idle quality
- Engine torque
- High-RPM power
- Fuel economy
- Internal exhaust-gas recirculation
- Turbocharger response
- Exhaust emissions
P0080 does not automatically mean the camshaft actuator has failed. It means the PCM has detected an electrical problem in the circuit controlling the exhaust solenoid.
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 logic
When the PCM requests an exhaust camshaft adjustment:
- It changes the solenoid duty cycle.
- The solenoid redirects engine oil.
- Oil pressure enters the camshaft actuator.
- The actuator rotates the camshaft relative to its sprocket.
- The camshaft sensor reports the new position.
- The PCM compares desired timing with actual timing.
If the solenoid circuit remains electrically high, the PCM may be unable to control oil flow and will often disable variable valve timing.
How the Exhaust Valve Control Solenoid Circuit Works
Many exhaust VVT solenoids have two wires:
- Ignition or relay-supplied voltage
- PCM-controlled ground
The PCM frequently controls the ground side with pulse-width modulation.
Pulse-width modulation allows the PCM to regulate:
- Solenoid current
- Internal valve position
- Oil flow
- Camshaft actuator movement
The PCM may monitor:
- Circuit voltage
- Current draw
- Coil resistance
- Driver feedback
- Commanded duty cycle
- Actual camshaft position
When the circuit is intact and commanded on, current flows through the solenoid coil.
When the circuit is open, the PCM may continue seeing supply voltage on the control side because no current can flow. This may trigger P0080.
What Does “Circuit High” Mean?
“Circuit high” means the PCM is detecting an electrical signal or feedback voltage above the expected range.
It does not necessarily mean:
- Engine oil pressure is high
- Camshaft timing is over-advanced
- Engine temperature is high
- Exhaust valve lift is excessive
- Battery charging voltage is high
Common circuit-high conditions include:
- Disconnected solenoid
- Open solenoid coil
- Broken power or control wire
- Control circuit shorted to battery voltage
- Loose connector terminal
- Corroded connection
- Excessive circuit resistance
- Failed PCM driver
On a common low-side-controlled circuit, the PCM expects the control voltage to fall when it grounds the solenoid.
If the circuit stays at battery voltage, the PCM knows the electrical command did not produce the expected response.
P0080 vs P0079
| Code | Fault | Common Direction |
| P0079 | Circuit low | Short to ground, shorted coil or low supply |
| P0080 | Circuit high | Open circuit, disconnected solenoid or short to voltage |
The terms “low” and “high” describe electrical circuit behavior.
They do not describe:
- Oil level
- Oil pressure
- Camshaft position
- Engine RPM
P0080 vs P0013
P0013 is generally defined as:
“B” Camshaft Position Actuator Circuit Bank 1
P0080 is defined as:
Exhaust Valve Control Solenoid Circuit High Bank 1
Both codes may involve the Bank 1 exhaust camshaft oil-control solenoid.
The main distinction is:
- P0013 is a broader exhaust camshaft actuator circuit code.
- P0080 specifically identifies a circuit-high condition.
Manufacturer terminology and diagnostic strategies vary, so use the service procedure written for the exact vehicle and engine.
Symptoms of P0080
Possible P0080 symptoms include:
- Check Engine Light
- Rough idle
- Unstable idle speed
- Engine hesitation
- Poor throttle response
- Reduced acceleration
- Loss of low-RPM 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
Some vehicles disable exhaust camshaft control and hold the camshaft in a default position.
The engine may continue running but feel noticeably flatter across part of the RPM range.
The PCM has not removed all the horsepower. It has merely asked the camshaft to stop being clever.
Can P0080 Cause a Rough Idle?
Yes.
Exhaust camshaft timing affects:
- Exhaust-gas scavenging
- Internal EGR
- Manifold vacuum
- Combustion stability
- Residual exhaust gas in the cylinders
If the 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 problems
- Fuel-delivery faults
- Low compression
- Mechanical timing errors
Confirm that P0080 is active before blaming every idle problem on the exhaust VVT solenoid.
Can P0080 Cause Poor Acceleration?
Yes.
Exhaust camshaft timing helps optimize:
- Cylinder scavenging
- Volumetric efficiency
- Torque production
- High-RPM breathing
- Turbocharger response
When the PCM disables exhaust VVT, the engine may feel:
- Sluggish
- Flat at low RPM
- Weak in the midrange
- Less responsive at high RPM
- Slow to build boost
The effect varies by engine design.
Common Causes of P0080
1. Disconnected Exhaust VVT Solenoid
A disconnected solenoid is one of the most common causes of P0080.
The connector may have been left unplugged during:
- Valve-cover replacement
- Timing-chain service
- Cylinder-head repair
- Engine replacement
- Intake manifold removal
- Oil-leak repair
- Previous VVT diagnosis
A disconnected solenoid prevents current flow and may leave the control circuit at a high voltage.
2. Open Solenoid Coil
The coil inside the exhaust valve control solenoid may break.
Possible causes include:
- Age
- Heat
- Engine vibration
- Internal corrosion
- Thermal cycling
- Manufacturing defect
An open solenoid typically measures:
- Infinite resistance
- Extremely high resistance
- No continuity
The PCM may detect no current when it commands the solenoid and store P0080.
3. Broken Control Wire
The PCM control wire may break because of:
- Engine vibration
- Harness tension
- Heat exposure
- Incorrect routing
- Rodent damage
- Previous repairs
- Connector strain
The outer insulation may remain intact while the conductor inside is broken.
4. Control Circuit Shorted to Battery Voltage
The control wire may contact:
- Solenoid power feed
- Fuel-injector power circuit
- Ignition-coil power
- Alternator wiring
- Battery-positive cable
- Incorrect accessory wiring
A short to voltage prevents the PCM from pulling the circuit low.
P0080 diagnostic testing commonly includes checking the solenoid power supply, control wire and harness for a short to power.
5. Loose Electrical Connector
A connector may look installed but fail to make reliable contact because of:
- Broken locking tab
- Missing secondary lock
- Loose terminal
- Connector not fully seated
- Incorrect connector
- Damaged housing
A loose connection may set P0080 intermittently or continuously.
6. Backed-Out Connector Terminal
A terminal may slide backward when the connector is installed.
Inspect for:
- Uneven pin depth
- Broken retaining tang
- Missing terminal lock
- Loose wire at the connector
- Pin that moves when lightly pulled
An apparently connected plug may still contain an electrically disconnected terminal.
7. Corroded Connector Terminals
Corrosion can create enough resistance to prevent proper current flow.
Inspect for:
- Green deposits
- White oxidation
- Darkened terminals
- Water
- Oil contamination
- Bent pins
- Damaged seals
- Spread terminals
8. Oil Inside the Connector
Engine oil may enter the connector through:
- Failed solenoid seal
- Valve-cover leak
- Oil migration through the component
- Contaminated engine harness
Oil can:
- Trap dirt
- Damage connector seals
- Reduce terminal contact
- Wick through the wiring
- Contribute to intermittent open circuits
Repair the source of the oil leak rather than repeatedly cleaning the same connector.
9. Heat-Damaged Wiring
The exhaust VVT solenoid is often mounted near hot components.
Wiring may be damaged by:
- Exhaust manifold heat
- Turbocharger heat
- EGR piping
- Cylinder-head heat
- Missing heat shield
- Incorrect harness routing
Heat can make insulation:
- Brittle
- Cracked
- Melted
- Fused to adjacent wiring
10. Chafed Engine Harness
The harness may rub against:
- Valve-cover edge
- Cylinder-head casting
- Engine bracket
- Intake manifold support
- Wiring tray
- Metal harness clip
A chafed control wire may open or contact a powered circuit as the engine moves.
11. Incorrect Previous Wiring Repair
Poor repairs may include:
- Twisted wires covered with tape
- Unsealed crimp connectors
- Incorrect wire gauge
- Weak solder joint
- Wrong terminal
- Wiring routed too close to exhaust heat
- Incorrect connector pinout
A wire may show battery voltage on a multimeter while still being unable to carry the required current.
12. Incorrectly Wired Replacement Pigtail
A replacement connector may have:
- Power and control wires reversed
- Terminals installed in the wrong cavities
- Poor crimps
- Incorrect wire colors
- Incompatible connector terminals
Always verify the pinout using a wiring diagram.
Wire colors are helpful. They are not a legally binding promise—especially after someone else has repaired the harness.
13. Failed Exhaust Valve Control Solenoid
The solenoid may fail electrically or mechanically.
Electrical failures include:
- Open coil
- Excessive resistance
- Broken internal terminal
- Intermittent internal connection
- Short to housing
Mechanical failures include:
- Stuck spool valve
- Sludge buildup
- Varnish
- Blocked oil screen
- Metal contamination
P0080 points toward the electrical circuit first.
14. Incorrect Replacement Solenoid
An incorrect solenoid may have:
- Wrong coil resistance
- Incompatible connector
- Different oil passages
- Incorrect operating frequency
- Poor internal construction
A new component may still be:
- Incorrect
- Defective
- Poorly manufactured
- Cataloged for another engine
New parts should be tested when the code appeared immediately after replacement.
15. High Circuit Resistance
Excessive resistance may be caused by:
- Corroded splice
- Partially broken wire
- Loose connector
- Heat-damaged terminal
- Weak relay contact
- Poor crimp
A basic continuity test may pass even when the circuit cannot carry enough current.
Use a loaded voltage-drop test.
16. Failed Fuse or Engine-Control Relay
Circuit design determines how a missing power supply affects the stored code.
Inspect the shared:
- Engine actuator fuse
- VVT fuse
- PCM relay
- Ignition relay
- Power-distribution splice
If several actuator codes appear together, a shared power problem is more likely than several simultaneous solenoid failures.
17. Poor PCM Connection
The PCM connector may have:
- Corrosion
- Water intrusion
- Bent terminal
- Backed-out pin
- Loose locking lever
- Damaged seal
- Poor terminal tension
Follow manufacturer procedures before disconnecting the PCM.
18. 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 circuit codes increase the likelihood of a shared voltage or ground problem.
19. Low Engine Oil Level
Low oil does not normally create a circuit-high electrical condition directly.
However, the VVT system still depends on adequate oil for hydraulic operation.
Low oil can cause:
- Slow camshaft response
- Cam phaser noise
- Solenoid sticking
- Additional timing codes
- Low oil pressure
Always check oil level before performing active VVT tests.
20. 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 than P0080, but it may coexist with an electrical solenoid failure.
An oil change will not reconnect a broken wire, though it may remove one additional problem from the list.
21. Incorrect Oil Viscosity
Oil that is too thick or too thin may cause:
- Delayed camshaft response
- Poor cold-start performance
- Low hot-idle oil pressure
- Cam phaser noise
- Timing-performance faults
Use the oil viscosity and specification required by the manufacturer.
22. PCM Software Issue
A software problem may cause the PCM to:
- Misinterpret driver feedback
- Command the solenoid incorrectly
- Store P0080 prematurely
- Remain in failsafe mode
Check for:
- Technical service bulletins
- Calibration updates
- Reprogramming instructions
- Revised diagnostic procedures
23. Failed PCM Driver
The PCM driver may be unable to pull the solenoid control circuit low.
Possible causes include:
- Previous short to battery voltage
- Shorted solenoid
- Excessive current
- Water intrusion
- Internal electronic failure
Only suspect the PCM after confirming:
- Correct solenoid resistance
- Proper supply voltage
- Control-wire continuity
- No short to voltage
- Connector integrity
- PCM powers and grounds
Replacing the PCM before checking whether the solenoid connector is attached remains an impressively expensive way to discover an unplugged component.
Is P0080 Serious?
P0080 is generally considered a moderate-severity code.
The engine may continue operating, but 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
- Higher emissions
- Hard starting
- Engine stalling
- Failed emissions inspection
P0080 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
- Multiple timing correlation codes are stored
- The engine enters reduced-power mode
Can You Drive With P0080?
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
- Timing correlation codes are present
- Engine will not start reliably
P0080 does not usually cause immediate engine damage by itself.
Continuing to drive with low oil pressure or severe timing noise is a different and considerably more expensive decision.
How to Diagnose P0080
Step 1: Scan All Stored Codes
Check for:
- P0078
- P0079
- P0080
- P0013
- P0014
- P0015
- P0017
- P0084
- P0085
- P0086
- 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
- VVT command
- Desired camshaft angle
- Actual camshaft angle
Step 2: Confirm the Correct Definition
Verify that the scanner identifies P0080 as:
Exhaust Valve Control Solenoid Circuit High Bank 1
The correct sequence is P0078 general, P0079 low and P0080 high.
Step 3: Identify Bank 1
Locate:
- Cylinder number 1
- Bank 1 cylinder head
- Bank 1 exhaust camshaft
- Correct exhaust VVT solenoid
Do not confuse:
- Bank 1 and Bank 2
- Intake and exhaust solenoids
- VVT solenoid and camshaft position sensor
Step 4: Check Engine Oil
Verify:
- Oil level
- Oil condition
- Correct viscosity
- Signs of leakage
- Oil-pressure warning behavior
Correct any oil problem before commanding the VVT system.
Step 5: Locate the Exhaust Solenoid
The exhaust VVT 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 exhaust camshaft oil passage
Use service information to identify the correct component.
Step 6: 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 solenoid should always be ruled out before advanced electrical testing.
Step 7: 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 8: Inspect the Wiring Harness
Follow the harness toward the PCM and fuse box.
Look for:
- Broken wires
- Chafed insulation
- Melted sections
- Pinched wiring
- Rodent damage
- Poor splices
- Contact with hot exhaust components
- Missing retainers
Step 9: Measure Solenoid Resistance
Measure resistance across the disconnected solenoid terminals.
Compare it with the manufacturer’s specification.
Possible findings:
- Infinite resistance: open coil
- Excessively high resistance: damaged coil or internal connection
- Very low resistance: shorted coil
- Correct resistance: continue circuit testing
Do not use a generic resistance specification from another vehicle.
Step 10: Test Each Terminal Against the Housing
When permitted by service information, test each solenoid terminal against the solenoid body.
Unexpected continuity may indicate:
- Internal short
- Insulation failure
- Contamination inside the solenoid
Step 11: Verify Supply Voltage
With ignition on, identify the power-supply terminal.
Expected voltage may be:
- Battery voltage
- Ignition voltage
- Relay-controlled voltage
- PCM-controlled voltage
If power is missing, inspect:
- Fuse
- Relay
- Power wire
- Shared splice
- Connector terminal
Step 12: Load-Test the Supply Circuit
An unloaded multimeter may show normal voltage through a corroded connection.
Perform an approved loaded test across:
- Fuse
- Relay contacts
- Supply wire
- Shared splice
- Connector terminal
Voltage that collapses under load indicates excessive resistance.
Step 13: Test the Control Wire for an Open
Disconnect the PCM and solenoid as instructed.
Measure continuity from the solenoid connector to the PCM terminal.
Check for:
- Infinite resistance
- Excessive resistance
- Broken splice
- Incorrect terminal location
- Intermittent connection
Move the harness while monitoring resistance.
Step 14: Test for a Short to Voltage
With the PCM and solenoid disconnected, check whether the control wire receives voltage from another circuit.
Possible sources include:
- Solenoid power feed
- Injector power
- Ignition-coil power
- Alternator wiring
- Aftermarket electrical wiring
Testing the control line for a short to power is an important part of diagnosing P0080.
Step 15: Inspect 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 inserting an oversized meter probe into the connector.
That can create the loose-terminal problem you were trying to find.
Step 16: 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 17: Command the Solenoid With a Scan Tool
Use a bidirectional scan tool when supported.
Monitor:
- Solenoid command
- Duty cycle
- Control voltage
- Current draw
- Desired exhaust camshaft angle
- Actual exhaust camshaft angle
- Engine idle speed
Possible results include:
- No current: open circuit or open solenoid
- Circuit remains high: open control wire, short to voltage or failed PCM driver
- Electrical response but no camshaft movement: hydraulic or mechanical problem
- Normal response: intermittent wiring fault or stored history code
Step 18: 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 readings with:
- Manufacturer specifications
- Bank 2 exhaust solenoid
- A known-good circuit
Step 19: Examine the PWM Waveform
An oscilloscope can display:
- Duty cycle
- Voltage amplitude
- PCM switching
- Current ramp
- Driver shutdown
- Intermittent dropouts
A circuit that remains near battery voltage when commanded may indicate:
- Disconnected solenoid
- Open solenoid coil
- Broken control wire
- Short to voltage
- Failed PCM driver
Step 20: 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 21: Inspect the Solenoid Mechanically
If the electrical circuit passes but VVT performance 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 generally set performance codes, but they may exist alongside P0080.
Step 22: Compare Bank 1 and Bank 2
On engines with two banks, compare:
- Solenoid resistance
- Supply voltage
- Control waveform
- Current draw
- Desired timing
- Actual timing
Bank 2 may provide a useful known-good reference when both systems use identical parts.
Step 23: 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 2: solenoid likely faulty
- P0080 remains on Bank 1: wiring or PCM circuit likely faulty
Do not swap intake and exhaust solenoids unless the manufacturer confirms they are interchangeable.
Step 24: 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 25: Check Technical Service Bulletins
Search current manufacturer information using:
- VIN
- Model year
- Engine code
- P0080
- Solenoid part number
- PCM calibration number
- Related codes
Possible factory corrections may include:
- Updated solenoid
- Revised wiring
- Connector repair
- Harness relocation
- PCM software update
- Revised diagnostic procedures
Step 26: Evaluate the PCM Driver
Only consider PCM failure after confirming:
- Solenoid resistance is correct
- Supply voltage is correct
- Control wire has continuity
- Control circuit is not shorted to voltage
- Connector terminals are secure
- PCM powers and grounds are correct
- Software is current
If the driver cannot pull the circuit low after all external tests pass, the PCM may require:
- Software update
- Module repair
- Replacement and programming
Step 27: 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 1 exhaust solenoid command.
- Check circuit voltage and current.
- Compare desired and actual 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 P0080 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 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 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+ |
Repair costs vary according to:
- Vehicle design
- Solenoid accessibility
- Wiring location
- Labor rate
- Oil contamination
- Additional timing faults
- Module programming requirements
A disconnected solenoid may take seconds to repair.
A broken control wire routed beneath the intake manifold may turn those seconds into several billable hours and a growing collection of removed plastic parts.
Common Diagnostic Mistakes
Avoid these common P0080 diagnostic mistakes:
- Calling P0080 the general exhaust-solenoid circuit code
- Confusing P0080 with P0079
- Assuming “circuit high” means high oil pressure
- Replacing the solenoid without testing resistance
- Ignoring an unplugged connector
- Misidentifying Bank 1
- Confusing intake and exhaust solenoids
- Testing only the power wire
- Failing to test for a short to voltage
- Checking continuity without load-testing the circuit
- Using generic solenoid resistance specifications
- Replacing the cam phaser before testing the circuit
- Replacing the PCM before inspecting connector terminals
- Assuming a new aftermarket solenoid must be good
- Failing to verify the repair with active scan-tool testing
P0080 is an electrical circuit-high code.
Replacing the timing chain before checking the two-wire connector is not technically impossible. It is simply an unusually expensive way to avoid using a multimeter.
Vehicles Commonly Affected
P0080 is a generic OBD-II code and may appear on various vehicles, including certain:
- Hyundai vehicles
- Kia vehicles
- Nissan vehicles
- Infiniti vehicles
- Mazda vehicles
- Mitsubishi vehicles
- Toyota vehicles
- Lexus vehicles
- Subaru vehicles
- Ford vehicles
- Lincoln vehicles
- Chevrolet vehicles
- GMC vehicles
- Cadillac models
- Dodge vehicles
- Jeep models
- Chrysler 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 vehicle.
P0080 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
Common diagnostic checks include:
- Solenoid connector condition
- Solenoid coil resistance
- Supply voltage
- PCM control wire continuity
- Control wire short to power
- Engine oil level and condition
P0079 and P0080 are commonly identified as the circuit-low and circuit-high exhaust-solenoid faults on Kia applications.
P0080 on Nissan and Infiniti Vehicles
Nissan and Infiniti may refer to the component as the:
Exhaust Valve Timing Control Solenoid Valve
Possible causes include:
- Open solenoid coil
- Disconnected connector
- Broken ECM control wire
- Harness short to voltage
- Corroded terminal
- ECM driver fault
- Incorrect replacement solenoid
If additional exhaust camshaft timing-performance codes are stored, inspect:
- Oil condition
- Oil pressure
- Solenoid screen
- Camshaft actuator
- Timing-chain condition
P0080 After Engine Repairs
If P0080 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 installed on 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 that appears immediately after repair work should first be investigated in the area that was disturbed.
The PCM can adjust cam timing several times per second. It remains entirely incapable of reconnecting a plug left hanging beside the valve cover.
P0080 After Replacing the VVT Solenoid
If P0080 appears after installing a new solenoid, verify:
- Correct part number
- Correct Bank 1 location
- Correct intake or exhaust position
- Connector fully seated
- Terminal alignment
- Coil resistance
- Pigtail wiring
- Solenoid pin condition
A new component may still be:
- Defective
- Incorrect
- Electrically incompatible
- Installed on the wrong camshaft
Do not condemn the PCM merely because the replacement part arrived in fresh packaging.
Can Dirty Oil Cause P0080?
Dirty oil may contribute to mechanical VVT problems, but P0080 specifically identifies a high electrical circuit condition.
Dirty oil may cause:
- Solenoid spool sticking
- Restricted oil screen
- Slow camshaft movement
- Cam phaser noise
- P0014 or P0015
Dirty oil does not directly explain:
- Disconnected connector
- Open solenoid coil
- Broken control wire
- Short to battery voltage
Check the oil, but continue electrical testing.
Can a Bad VVT Solenoid Cause P0080?
Yes.
An exhaust VVT solenoid can cause P0080 if its internal coil is:
- Open
- Excessively resistive
- Intermittently disconnected
- Broken at an internal terminal
Measure coil resistance and compare it with the correct manufacturer specification.
Can a Bad Camshaft Position Sensor Cause P0080?
A camshaft position sensor is not a common direct cause of P0080.
The camshaft sensor reports camshaft position, while P0080 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.
How to Prevent P0080
Reduce the likelihood of P0080 by:
- Maintaining the correct engine-oil level
- Using the correct oil viscosity
- Following recommended oil-change intervals
- Repairing oil leaks promptly
- Keeping solenoid connectors clean and dry
- Replacing damaged connector seals
- Reinstalling engine-harness retainers
- Keeping wiring away from exhaust heat
- Inspecting wiring after engine repairs
- Using OEM-quality VVT solenoids
- Avoiding oversized electrical test probes
- Repairing damaged wiring before it shorts to voltage
Frequently Asked Questions
What does P0080 mean?
P0080 means the PCM has detected a higher-than-expected electrical signal in the Bank 1 exhaust valve control solenoid circuit.
What is the full definition of P0080?
The generic definition is:
Exhaust Valve Control Solenoid Circuit High Bank 1
Is P0080 the general exhaust valve control solenoid code?
No.
The correct sequence is:
- P0078: general circuit malfunction
- P0079: circuit low
- P0080: circuit high
Where is Bank 1?
Bank 1 is the side of the engine containing cylinder number 1.
Inline engines have only one bank, which is Bank 1.
What does circuit high mean?
Circuit high means the monitored voltage or driver feedback is above the PCM’s expected range.
Common causes include:
- Open circuit
- Disconnected solenoid
- Broken wire
- Short to battery voltage
- Failed PCM driver
Does circuit high mean high engine-oil pressure?
No.
The word “high” refers to the electrical circuit signal, not engine-oil pressure.
What causes P0080 most often?
Common causes include:
- Disconnected exhaust VVT solenoid
- Open solenoid coil
- Broken control wire
- Corroded connector
- Short to voltage
- Incorrect replacement solenoid
- PCM driver fault
Is P0080 serious?
P0080 is moderately serious.
The engine may continue running, but performance, fuel economy, idle quality and emissions may be affected.
Can I drive with P0080?
Possibly for a short distance if:
- Oil pressure is normal
- The 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 P0080 cause rough idle?
Yes.
Loss of exhaust camshaft control may cause rough idle, surging, misfires or stalling.
Can P0080 cause poor acceleration?
Yes.
The engine may lose torque and throttle response if exhaust camshaft timing cannot be adjusted.
Can an unplugged VVT solenoid cause P0080?
Yes.
A disconnected solenoid can create an open circuit and leave the monitored control circuit at a high voltage.
Can broken wiring cause P0080?
Yes.
An open control wire or a control wire shorted to battery voltage can set P0080.
Can dirty oil cause P0080?
Dirty oil can contribute to hydraulic VVT problems, but P0080 requires electrical testing because it identifies a circuit-high condition.
What is the difference between P0078 and P0080?
P0078 indicates a general Bank 1 exhaust valve control solenoid circuit malfunction.
P0080 specifically indicates that the circuit signal is above the expected range.
What is the difference between P0079 and P0080?
P0079 indicates a low circuit condition.
P0080 indicates a high circuit condition.
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 battery voltage
- Voltage drop
Use vehicle-specific specifications.
Can I apply battery voltage directly to the solenoid?
Only if the manufacturer’s testing procedure permits it.
Incorrect polarity, continuous power or excessive current may damage the solenoid or 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 P0080 cost to repair?
A basic 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 P0080 code means the PCM has detected a high electrical condition in the Bank 1 exhaust valve control solenoid circuit.
The most common causes include:
- Disconnected exhaust VVT solenoid
- Open solenoid coil
- Broken PCM control wire
- Control circuit shorted to battery voltage
- Loose or corroded connector
- Incorrect replacement solenoid
- Failed PCM driver
Start diagnosis by:
- Confirming P0080 is the circuit-high code.
- Scanning for related trouble codes.
- Correctly identifying Bank 1.
- Checking engine oil level and condition.
- Confirming the exhaust solenoid is connected.
- Inspecting connector terminals.
- Measuring solenoid resistance.
- Verifying supply voltage.
- Testing control-wire continuity.
- Checking for a short to battery voltage.
- Commanding the solenoid with a bidirectional scan tool.
- Evaluating the PCM only after external circuit tests pass.
Do not interpret “circuit high” as high oil pressure or an over-advanced camshaft.
P0080 means the electrical circuit remains above the voltage the PCM expects. On many systems, that points toward an open solenoid, disconnected connector, broken control wire or unwanted battery voltage.
The repair may be as simple as reconnecting one plug.
It may also require following one damaged wire through an engine harness routed beneath enough plastic covers to suggest that the manufacturer was trying to hide it from future generations.
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
Related Camshaft Timing Codes
- P0013 Code Explained: “B” Camshaft Position Actuator Circuit Bank 1
- P0014 Code Explained: “B” Camshaft Timing Over-Advanced Bank 1
- P0015 Code Explained: “B” Camshaft Timing Over-Retarded Bank 1
- P0017 Code Explained: Crankshaft–Camshaft Correlation Bank 1 Sensor B
Previous P-Code Articles
- P0077 Code Explained: Intake Valve Control Solenoid Circuit High Bank 1
- P0078 Code Explained: Exhaust Valve Control Solenoid Circuit Bank 1
- P0079 Code Explained: Exhaust Valve Control Solenoid Circuit Low Bank 1
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