VOLVO
ECM-0340 - Camshaft position (CMP) sensor. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
5 modelsC30 (2007–2013), S40 (1996–2004), S40 (2004–2013), V40 (1996–2004), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2007Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (1996–2004)2001–2004Engine B4184SJ only
- Volvo S40 (2004–2013)2005Engine B4184S11 only
- Volvo S40 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo S40 (2004–2013)2007Engine B4184S11, B4184S8, B4204S3 only
- Volvo V40 (1996–2004)2001–2004Engine B4184SJ only
- Volvo V50 (2004–2013)2005Engine B4184S11 only
- Volvo V50 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo V50 (2004–2013)2007Engine B4184S11, B4184S8, B4204S3 only
What does this fault code mean?
The engine control module (ECM) monitors the camshaft sensor signal and treats it as faulty if it does not pulse as it should or deviates abnormally. The fault can be set both at start and while driving, and the engine may then fail to start. The causes are contact resistance in the connections, open or short circuits in the wiring, or a damaged camshaft sensor.
Possible causes
- Contact resistance in the connections
- Open circuit in the supply or ground wire, or ground wire shorted to voltage
- Open circuit in the signal wire, or signal wire shorted to ground or voltage
- Defective or damaged camshaft position (CMP) sensor
What you can do
- 1Read out the fault code, erase it and road-test to see whether it returns
- 2Switch off the ignition and check the camshaft sensor and control module connectors for looseness, contact resistance and oxidation
- 3Look for chafed wires or pinched areas in the camshaft sensor wiring, especially where it runs close to the engine
- 4Use a multimeter to check that the wires to the camshaft sensor have no open circuit and are not shorted to ground or voltage
- 5If you have a diagnostic tool, compare the camshaft signal with the crankshaft signal in live data during a start attempt
- 6If the wiring is intact, have a workshop with diagnostic equipment check the camshaft sensor and replace it if needed
Symptoms you may notice2
- The engine does not start
- The malfunction indicator lamp (MIL) is lit
What the fault can affect1
- Fuel cut-off may not take place
General guidance for car owners. Diagnosis on the car can point to a different cause.