P0342: Camshaft Position Sensor "A" Circuit Low (Bank 1 Or Single Sensor)
The camshaft position sensor signal is below its normal range.
Normal risk
Usually drivable, but starting may be harder. Have it checked soon.
Short answer · Can I keep driving with P0342?
Usually yes, but the engine may take longer to start. Have the sensor and wiring checked soon.
What does P0342 mean?
Code P0342 means the camshaft sensor signal is lower than a working sensor gives. An open circuit, a short to ground, a missing supply or a failed sensor are common causes.
What the car does when the code is set
The check engine light comes on. Most engines keep running using the crankshaft signal, but starting may take longer, and the variable valve timing may be switched off, which reduces power.
How the system works
The camshaft turns at half the crankshaft speed, so the crankshaft signal alone cannot tell whether a piston at top dead centre is on its compression or exhaust stroke. The camshaft position sensor reads a trigger wheel on the camshaft and gives that information. The engine control unit uses it for sequential injection, ignition on some engines and variable valve timing control. Many engines can still run without it after a few revolutions, but starting may take longer.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Faulty camshaft position sensorThe sensor fails or gives an irregular signal.
- Wiring or connector faultOil leaks from the cam cover often reach the connector.
- Timing problemA stretched chain or jumped belt changes the signal timing.
- Damaged trigger wheelBent or broken teeth on the camshaft trigger.
How it is diagnosed
- Check the connectorLook for oil in the connector and damaged pins.
- Check the sensor signalCheck supply, ground and signal as in the service data.
- Check for related codesCombined with crankshaft-camshaft correlation codes, the timing should be checked.
- Replace and clearAfter replacing the sensor, clear the code and check the engine starts normally.
Questions about P0342
Why does the engine crank longer with P0342?
Without the camshaft signal, the control unit needs more turns to find the right cylinder for injection and ignition.
Can I drive with a camshaft sensor code?
Usually yes, but the engine may be harder to start and use more fuel. Have it fixed soon.
Why do I need a timing check?
If both camshaft and crankshaft sensors are fine but codes persist, the timing itself may have shifted.