P0368

What it means

P0368 means the engine control unit has detected a voltage or signal level that is too high in the circuit for camshaft position sensor B on bank 1. Sensor B is usually the exhaust camshaft sensor, though the labelling varies by engine. The control unit saw an out-of-range or implausible signal from that circuit, so it stored the fault.

Symptoms

• Engine warning light on
• Long cranking or hard starting
• Rough running or misfire
• Loss of power or reduced performance
• Poor fuel economy
• Engine may run in limp mode or stall

Possible causes

• Faulty camshaft position sensor B (bank 1)likely
• Damaged, chafed or corroded wiring in the sensor signal, supply or earth circuit, including a short to voltagelikely
• Loose, corroded or contaminated sensor connectorlikely
• Damaged or worn reluctor or trigger wheel, or incorrect air gap or sensor fittingpossible
• Camshaft timing out of position due to a stretched chain or slipped belt, or a variable valve timing faultpossible
• Faulty engine control unit or a fault in the sensor power supplyrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data to see engine speed, temperature and load when the fault set
2. Check for other related codes, such as crankshaft sensor, camshaft correlation or valve timing codes, and treat those too
3. Visually inspect the sensor, connector and harness for oil contamination, heat damage, chafing and corrosion
4. Check that the sensor is fitted securely and not damaged, and inspect the trigger wheel if accessible
5. Using the manufacturer's wiring diagram, test the sensor supply voltage, earth and signal wire for shorts to voltage, open circuits and high resistance
6. Watch the live camshaft and crankshaft signal data while cranking and running, or view the waveform on an oscilloscope, to look for dropouts or abnormal levels
7. Check the cam timing and variable valve timing operation against the manufacturer's procedure, as the method depends on the engine
8. Clear the code and road test to confirm whether it returns

How to fix

• Replace the camshaft position sensor B if it tests faulty
• Repair or replace damaged wiring and fix any short to voltage
• Clean, repair or replace the corroded or loose connector terminals
• Replace a damaged trigger wheel and set the correct sensor fitting and air gap
• Correct the valve timing by replacing worn timing components if the timing is out
• Replace or reprogram the engine control unit only after all other causes are ruled out and the manufacturer's procedure supports it

Can I keep driving?

Nearby codes

• P0367GenericCamshaft Position Sensor B Circuit Low Bank 1
• P0369GenericCamshaft Position Sensor B Circuit Intermittent Bank 1