The P0369 OBD-II trouble code means the engine control module has detected an intermittent signal from Camshaft Position Sensor “B” on Bank 1.
On most dual-overhead-cam engines, Sensor B monitors the exhaust camshaft. Bank 1 is the cylinder bank containing cylinder number one. Manufacturer terminology varies, so confirm the correct sensor before testing or replacing parts.
Unlike a signal that remains consistently low or high, P0369 indicates that the camshaft signal works normally and then briefly disappears, becomes corrupted or falls outside the acceptable range.
Common causes include loose connector terminals, wiring broken beneath intact insulation, heat-sensitive sensor electronics, oil contamination, vibration-related harness damage or a failing camshaft sensor.
P0369 Code Quick Reference
| Item | Details |
|---|---|
| Code | P0369 |
| Definition | Camshaft Position Sensor “B” Circuit Intermittent Bank 1 |
| System | Camshaft position monitoring |
| Fault type | Intermittent signal loss or corruption |
| Sensor B | Usually the exhaust camshaft sensor |
| Bank 1 | Cylinder bank containing cylinder number one |
| Common symptoms | Random stalling, hard starting, hesitation and reduced power |
| Common causes | Loose terminals, broken wiring, heat-sensitive sensor |
| Repair urgency | Moderate to high |
| Safe to drive? | Limited driving only because stalling may occur |
What Does the P0369 Code Mean?
The camshaft position sensor reports the rotational position of the camshaft to the ECM. The ECM compares that signal with the crankshaft position signal to determine:
- Which cylinder is approaching its compression stroke
- When to operate each fuel injector
- When to trigger ignition events
- Whether variable valve timing is responding correctly
- Whether the crankshaft and camshaft remain synchronized
- Whether individual cylinder misfires are occurring
A healthy camshaft sensor produces a consistent electrical pattern whenever the engine is cranking or running.
P0369 is stored when the Bank 1 Sensor B signal becomes unreliable for a brief period. The signal may:
- Disappear completely
- Drop to zero momentarily
- Become stuck high
- Lose individual pulses
- Develop electrical noise
- Return after the engine cools
- Change when the harness moves
- Fail only during cranking
- Drop out during acceleration or road vibration
Because the fault is intermittent, the engine may run perfectly during diagnosis. Naturally, electrical problems understand when a technician is watching.
What Does Sensor “B” Mean?
On most dual-overhead-cam engines:
- Sensor A monitors the intake camshaft.
- Sensor B monitors the exhaust camshaft.
P0369 therefore usually concerns the Bank 1 exhaust camshaft position sensor.
Some manufacturers use different naming conventions or install multiple sensors on each bank. Verify Sensor B using:
- Factory wiring diagrams
- Component-location information
- Scan-tool labels
- Connector pinouts
- Vehicle-specific repair procedures
Do not identify the sensor based only on its location at the front or rear of the cylinder head.
What Is Bank 1?
Bank 1 is the cylinder bank containing cylinder number one.
On an inline engine, the entire engine is Bank 1.
On V6, V8, V10, V12 and horizontally opposed engines, Bank 1 may be located on either side of the vehicle.
Bank 1 is not automatically the driver side or passenger side. Confirm cylinder numbering before testing.
How the Camshaft Sensor Signal Works
Most modern camshaft sensors use either a Hall-effect or variable-reluctance design.
Hall-effect sensor
A typical Hall-effect sensor uses:
- Supply or reference voltage
- Sensor ground
- Digital signal wire
As the camshaft target passes the sensor, the signal switches between low and high voltage.
An intermittent Hall-effect signal may result from:
- Momentary loss of supply voltage
- Poor sensor ground
- Loose signal terminal
- Internal sensor failure
- Broken conductor
- Heat-sensitive electronics
- Signal wire intermittently touching ground or voltage
Variable-reluctance sensor
A variable-reluctance sensor normally uses two signal wires and generates alternating voltage as the trigger wheel moves past it.
An intermittent signal may be caused by:
- Excessive sensor air gap
- Low cranking speed
- Metal debris on the sensor
- Damaged reluctor
- Broken internal winding
- Loose connector
- Wiring resistance
- Sensor output weakening when hot
Testing procedures differ between sensor designs. Identify the circuit before connecting test equipment.
What Does “Intermittent” Mean?
An intermittent electrical fault is present only under certain conditions.
The failure may depend on:
- Engine temperature
- Harness position
- Engine movement
- Road vibration
- Moisture
- Electrical load
- Cranking voltage
- Engine speed
- Vehicle acceleration
- Connector temperature
- Recent repair activity
The sensor may test correctly while the vehicle is parked and fail only after thirty minutes of driving.
This makes freeze-frame data, waveform recording and careful harness testing especially important.
Symptoms of P0369
Common symptoms include:
- Illuminated check engine light
- Random engine stalling
- Difficult hot restart
- Intermittent no-start
- Extended cranking
- Rough idle
- Hesitation
- Sudden loss of power
- Engine misfires
- Reduced acceleration
- Poor fuel economy
- Unstable VVT operation
- Reduced-power mode
- Unusual transmission shifting
- Engine cutting out over bumps
- Engine restarting normally after cooling
- No noticeable symptoms between failures
The engine may stall when the camshaft signal disappears and restart immediately once the signal returns.
Common Causes of P0369
Possible causes include:
- Failing Camshaft Position Sensor B
- Heat-sensitive internal sensor failure
- Loose sensor connector
- Broken connector lock
- Spread connector terminal
- Pushed-back terminal
- Corroded electrical terminals
- Water intrusion
- Oil contamination inside the connector
- Signal wire broken beneath intact insulation
- Harness chafing against the engine
- Wiring stretched during previous repairs
- Intermittent short to ground
- Intermittent short to reference voltage
- Intermittent open signal circuit
- Unstable sensor supply voltage
- Poor sensor ground
- Shared reference circuit intermittently pulled down
- Low cranking voltage
- Excessive engine movement from failed mounts
- Harness routed near ignition or charging components
- Damaged signal shielding
- Electrical interference
- Excessive sensor air gap
- Metal debris on a magnetic sensor
- Damaged or loose camshaft reluctor
- Excessive camshaft end play
- ECM connector-terminal problem
- ECM input-circuit failure
- Incorrect aftermarket sensor
Mechanical timing faults more commonly produce performance or correlation codes. Diagnose P0369 as an intermittent electrical signal problem unless additional evidence points toward mechanical timing.
How Serious Is the P0369 Code?
P0369 is moderately to highly serious because the engine may stall without warning.
The ECM may temporarily substitute crankshaft-position information, but some vehicles cannot maintain normal ignition and fuel-injection synchronization without a reliable camshaft signal.
Possible consequences include:
- Unexpected stalling
- No-start condition
- Reduced engine power
- Misfires
- Incorrect fuel-injection timing
- Poor emissions performance
- Catalytic-converter damage
- Unreliable VVT operation
- Unsafe loss of power in traffic
Stop driving if:
- The engine stalls repeatedly
- The check engine light flashes
- Power drops unpredictably
- The vehicle enters reduced-power mode
- The engine runs severely rough
- Timing-chain noise is present
P0369 vs P0365
Both codes monitor Camshaft Position Sensor B on Bank 1, but they describe different failure patterns.
| Code | Meaning |
| P0365 | General Sensor B circuit malfunction |
| P0369 | Sensor B signal becomes intermittent |
P0365 may indicate a consistent circuit problem. P0369 specifically indicates that the signal disappears or becomes invalid temporarily.
A completely broken signal wire may set P0365. A conductor that separates only when the engine moves may set P0369.
P0369 vs P0366
P0366 means the Sensor B signal is present but does not fall within the expected operating range or pattern.
P0369 means the signal periodically drops out or becomes unreliable.
| Code | Diagnostic focus |
| P0366 | Implausible signal performance |
| P0369 | Intermittent signal loss |
A damaged reluctor producing a consistently distorted pattern may set P0366. A loose connector that interrupts the signal over bumps may set P0369.
P0369 vs P0367
P0367 indicates that the Sensor B signal remains below the expected voltage threshold.
P0369 indicates that the signal works normally and then briefly drops out.
A wire permanently shorted to ground is more likely to set P0367. A chafed wire touching ground only during engine movement may set P0369.
P0369 vs P0368
P0368 indicates that the Bank 1 Sensor B signal remains too high.
P0369 concerns a signal that fails unpredictably.
| Code | Electrical behavior |
| P0368 | Signal consistently too high |
| P0369 | Signal intermittently disappears or becomes invalid |
A signal wire continuously shorted to reference voltage may set P0368. A loose terminal that briefly creates an open circuit may set P0369.
P0369 vs P0344
P0344 and P0369 both describe intermittent camshaft-position signals, but they usually monitor different camshafts.
| Code | Sensor |
| P0344 | Camshaft Position Sensor A intermittent, Bank 1 |
| P0369 | Camshaft Position Sensor B intermittent, Bank 1 |
On most DOHC engines:
- Sensor A monitors the intake camshaft.
- Sensor B monitors the exhaust camshaft.
The diagnostic techniques are similar, but the sensors, wiring and ECM terminals are different.
P0369 vs P0017
P0017 identifies a correlation problem between the crankshaft and Bank 1 Sensor B camshaft.
P0369 identifies an intermittent Sensor B electrical signal.
A momentary sensor dropout can interfere with camshaft-to-crankshaft comparison and contribute to P0017. Repair the intermittent signal problem before concluding that the timing chain has stretched.
How to Diagnose the P0369 Code
Intermittent faults require more than a static resistance check. Useful equipment includes:
- Professional scan tool
- Digital multimeter
- Oscilloscope
- Back-probe leads
- Vehicle-specific wiring diagram
- Terminal-tension test kit
1. Scan all modules
Record every stored, pending and permanent code.
Look for:
- P0365–P0368
- P0013–P0017
- Crankshaft-position sensor codes
- VVT codes
- Misfire codes
- Low-voltage codes
- Shared reference-voltage faults
Save the freeze-frame data before clearing anything.
Important information includes:
- Engine speed
- Coolant temperature
- Battery voltage
- Vehicle speed
- Engine load
- Commanded camshaft position
- Actual camshaft position
- Time since startup
If P0369 consistently sets at the same coolant temperature, heat may be the trigger.
2. Ask when the symptoms occur
Determine whether the failure happens:
- During cold startup
- After the engine becomes hot
- During hot restart
- Over bumps
- During acceleration
- During braking
- In wet weather
- After engine repairs
- With accessories operating
- At a specific engine speed
Intermittent problems leave clues. The driver’s description may identify the test conditions needed to reproduce the fault.
3. Confirm Bank 1 and Sensor B
Use vehicle-specific information to identify:
- Cylinder number one
- Bank 1
- Sensor B
- Sensor type
- Supply circuit
- Ground circuit
- Signal wire
- ECM connector and terminal
Testing the wrong sensor produces clean results and absolutely no progress.
4. Inspect the sensor connector
Disconnect the connector with the ignition off and inspect:
- Terminal corrosion
- Oil contamination
- Moisture
- Bent pins
- Spread terminals
- Recessed terminals
- Broken connector lock
- Damaged weather seal
- Loose wire crimps
- Evidence of overheating
Gently pull each wire from behind the connector. A conductor may be broken inside the insulation while the outer jacket still looks normal.
5. Check terminal tension
Use the correct terminal gauge to compare terminal grip with a known-good connector.
A loose female terminal may make contact while parked and disconnect when the engine vibrates.
Do not jam an oversized test probe into the terminal. That can spread it and turn a suspected intermittent connection into a guaranteed one.
6. Inspect the wiring harness
Follow the harness from Sensor B toward the ECM.
Look for:
- Harness contact with brackets
- Melted insulation
- Chafing against the cylinder head
- Wiring trapped beneath an engine cover
- Improperly secured harness sections
- Previous splice repairs
- Rodent damage
- Oil-soaked loom
- Excessive tension
- Wiring routed near ignition coils or alternator output cables
Pay close attention to bends near connectors. Copper conductors commonly break where the wire repeatedly flexes.
7. Check battery and charging voltage
Verify:
- Battery state of charge
- Cranking voltage
- Charging voltage
- Battery-terminal condition
- Engine grounds
- ECM power and ground
An unstable electrical system can interrupt sensor operation and create multiple seemingly unrelated codes.
8. Verify supply voltage and ground
For a powered sensor, back-probe the supply and ground circuits while the engine runs.
Monitor for:
- Supply-voltage dropouts
- Ground voltage spikes
- Excessive ground voltage drop
- Voltage changes during harness movement
- Voltage changes as the engine warms
A min/max recording meter may capture a brief failure that disappears too quickly to see on the display.
9. Monitor the signal with a scan tool
Observe:
- Camshaft synchronization
- Actual camshaft position
- Desired camshaft position
- Camshaft sensor status
- Engine RPM
- VVT command
Use graphing mode when available. A brief vertical drop or impossible position change may coincide with the fault.
Scan-tool data can be filtered or updated too slowly to capture very short dropouts, so an oscilloscope remains the preferred tool.
10. Record the waveform
Connect an oscilloscope to the Sensor B signal circuit.
A healthy Hall-effect waveform should generally show:
- Clean high and low states
- Sharp transitions
- Consistent pulse spacing
- Stable amplitude
- No missing pulses
Look for:
- Momentary flatline
- Missing pulses
- Signal stuck high briefly
- Signal stuck low briefly
- Electrical noise
- Amplitude collapsing when hot
- Dropouts during engine movement
Use a long time base or recording function so the scope can capture a failure during a road test or extended idle period.
11. Perform a wiggle test
While monitoring the signal, gently move:
- Sensor connector
- Harness bends
- Wiring near brackets
- Harness sections behind the cylinder head
- ECM connector
If the waveform changes or the engine stumbles, isolate the affected section.
A wiggle test should reproduce the fault, not involve pulling hard enough to manufacture one.
12. Test the sensor when hot
Allow the engine to reach operating temperature. Shut it off and monitor the signal during heat soak and restart.
A sensor may fail only after internal electronics expand with heat.
If power and ground remain stable while the signal disappears, the sensor becomes a strong suspect.
13. Test during cold startup
Some sensors fail only when cold.
Monitor:
- Cranking voltage
- Sensor supply
- Signal amplitude
- Synchronization status
- Engine speed
Low cranking speed can reduce output from a variable-reluctance sensor and expose borderline wiring resistance.
14. Check for vibration-related failure
If the fault occurs during acceleration, braking or over bumps, inspect:
- Engine mounts
- Harness slack
- Wiring near moving components
- Connector retention
- Strain near sensor terminals
A failed engine mount can allow enough movement to pull on a marginal sensor harness.
15. Check for electrical interference
Inspect signal-wire routing near:
- Ignition coils
- Alternator wiring
- Starter cables
- Injector power circuits
- Aftermarket ignition systems
- Audio amplifier power cables
- Remote-start wiring
- Poorly grounded accessories
Damaged shielding or improper routing can introduce noise into the camshaft signal.
16. Inspect the trigger wheel and sensor air gap
If the circuit tests correctly, inspect where accessible for:
- Loose reluctor
- Bent trigger teeth
- Excessive air gap
- Metal debris
- Camshaft end play
- Sensor contact with the target
A loose reluctor or excessive camshaft movement can produce an intermittent pattern even when the sensor and wiring remain electrically healthy.
17. Compare the signal at the sensor and ECM
If possible, observe the waveform at both ends of the signal circuit.
- A clean waveform at the sensor but corrupted signal at the ECM indicates a wiring or terminal problem.
- A corrupted waveform at both locations points toward the sensor, supply, ground or trigger wheel.
- A clean waveform at the ECM while the scan data fails may indicate an ECM input or software problem.
18. Evaluate the ECM last
Before replacing the ECM, verify:
- Correct sensor part number
- Stable power and ground
- Good terminal tension
- Signal-wire integrity
- Clean waveform
- Correct reluctor condition
- Proper mechanical timing
- Applicable software updates
ECM failure is possible, but replacing it before finding a loose terminal is an expensive way to preserve the original fault.
Common P0369 Diagnostic Mistakes
Clearing the code before saving freeze-frame data
Freeze-frame temperature and voltage may reveal exactly when the signal failed.
Replacing the sensor because the code names it
The connector or wiring may be intermittently interrupting a perfectly functional sensor.
Testing only while the engine is cold
Heat-sensitive sensors often pass every cold test.
Relying only on resistance
A circuit may show correct resistance while stationary and open when the harness moves.
Ignoring terminal tension
A connector can look clean and fully seated while one terminal barely contacts its pin.
Performing only a quick scan-tool check
Short signal dropouts may occur faster than the scan tool updates. A recording oscilloscope is more effective.
Replacing the timing chain first
P0369 primarily indicates intermittent signal integrity. Mechanical timing should be investigated only when supporting evidence exists.
How to Fix the P0369 Code
The correct repair depends on testing.
Possible repairs include:
- Securing the Sensor B connector
- Replacing damaged connector locks
- Repairing loose or spread terminals
- Removing approved connector corrosion
- Repairing wiring broken beneath the insulation
- Replacing damaged harness sections
- Correcting a short to ground or voltage
- Restoring stable sensor supply voltage
- Repairing the sensor ground
- Replacing a heat-sensitive Camshaft Position Sensor B
- Installing the correct OEM-quality sensor
- Rerouting wiring away from interference
- Restoring damaged signal shielding
- Securing the harness against engine movement
- Replacing a damaged reluctor
- Correcting the sensor air gap
- Repairing excessive camshaft movement
- Updating ECM software
- Repairing or replacing the ECM after complete testing
Estimated P0369 Repair Costs
| Repair | Estimated cost |
| Diagnostic inspection | $100–$275 |
| Connector or terminal repair | $100–$400 |
| Wiring-harness repair | $150–$700 |
| Camshaft position sensor replacement | $150–$550 |
| Engine-ground repair | $100–$400 |
| Engine-mount replacement | $250–$1,200 |
| Trigger-wheel repair | $500–$2,500+ |
| ECM replacement and programming | $800–$2,500+ |
Actual costs depend on sensor accessibility, engine design and the amount of diagnostic time required to reproduce the intermittent failure.
Can You Drive with the P0369 Code?
Driving is not recommended because an intermittent camshaft signal can cause sudden stalling.
A short trip may be possible if:
- The engine runs normally
- The check engine light remains steady
- No stalling has occurred
- Acceleration remains predictable
Stop driving if:
- The engine stalls
- The check engine light flashes
- Power drops suddenly
- The vehicle enters limp mode
- The engine becomes difficult to restart
A fault that disappears after restarting remains a fault. It has merely learned to hide better.
How to Verify the Repair
After completing the repair:
- Clear all diagnostic codes.
- Monitor Sensor B synchronization.
- Record the camshaft waveform.
- Perform a cold start.
- Allow the engine to reach operating temperature.
- Perform a hot restart.
- Move the repaired harness while monitoring the signal.
- Road-test under the freeze-frame conditions.
- Rescan for pending codes.
- Complete any required relearn procedure.
- Confirm readiness monitors complete normally.
Intermittent repairs require verification under the conditions that originally triggered the code.
Frequently Asked Questions
What does the P0369 code mean?
P0369 means the ECM detected an intermittent signal from Camshaft Position Sensor B on Bank 1.
Is Sensor B the exhaust camshaft sensor?
On most DOHC engines, yes. Confirm the manufacturer’s designation before testing.
Which side is Bank 1?
Bank 1 is the cylinder bank containing cylinder number one.
Does P0369 mean the sensor is bad?
Not necessarily. Loose terminals, broken wiring, unstable power, poor ground or reluctor problems can also cause it.
Why does P0369 appear only when the engine is hot?
The sensor’s internal electronics or a connector terminal may fail as temperatures increase.
Can a loose connector cause P0369?
Yes. Poor terminal contact is one of the most common causes of intermittent sensor signals.
Can P0369 cause stalling?
Yes. Losing the camshaft signal may interrupt fuel and ignition synchronization.
Can a weak battery cause P0369?
Low or unstable cranking voltage can interrupt sensor operation, especially during startup.
Can a timing chain cause P0369?
Mechanical timing problems more commonly cause correlation codes. A loose trigger wheel or excessive camshaft movement can sometimes create intermittent sensor patterns.
Why does the engine restart normally?
The electrical connection or sensor may begin working again after vibration changes, temperature falls or the circuit resets.
Final Thoughts
P0369 means the Bank 1 Camshaft Position Sensor B signal is dropping out or becoming unreliable intermittently.
Begin with the conditions recorded in freeze-frame data. Inspect connector terminal tension, monitor supply voltage and ground, perform heat and wiggle tests, and record the signal waveform long enough to capture the failure.
Intermittent problems are frustrating because they rarely fail while sitting politely in the repair bay. Reproduce the conditions, capture the dropout and repair the evidence—not whichever part happens to be closest.
