OBD-II · Engine and powertrain (P)
P0340
Camshaft position sensor circuit fault
What it means
The camshaft position signal is missing or invalid.
Symptoms
- longer cranking before the engine starts
- rough running or reduced power
- engine warning light
- sometimes stalling
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | failed cam sensor |
| 02 | wiring fault |
| 03 | damaged camshaft signal target or excessive sensor gap |
| 04 | low battery voltage |
| 05 | connector oil contamination |
What to check, step by step
- 01Inspect the sensor connector for oil, corrosion and broken pins
- 02Check the supply voltage, ground and signal (with a scope if possible)
- 03Compare the camshaft signal with the crankshaft signal and check cam/crank deviation values
- 04Check the trigger wheel and the mechanical timing if the sensor and wiring are fine
- 05Replace the sensor if it is faulty