ECM-0335 - Engine speed (RPM) 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:
6 modelsC30 (2007–2013), C70 (2006–2013), S40 (1996–2004), S40 (2004–2013), V40 (1996–2004), V50 (2004–2013)
Show models by year and engine (12)
- Volvo C30 (2007–2013)2007Engine D4204T only
- Volvo C30 (2007–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo C70 (2006–2013)2008Engine D4204T only
- Volvo C70 (2006–2013)2009–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo S40 (1996–2004)2001–2004Engine B4184SJ only
- Volvo S40 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007Engine D4204T only
- Volvo S40 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo V40 (1996–2004)2001–2004Engine B4184SJ only
- Volvo V50 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007Engine D4204T only
- Volvo V50 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
What does this fault code mean?
The engine control module (ECM) counts the pulses from the engine speed sensor, which reads the magnetic poles on a magnetic wheel on the crankshaft, and uses the signal to find when the pistons are at top dead centre. If the pulses become abnormal, or the control module cannot find the reference position, the fault is set. It is checked while the engine turns, and the car may then crank without starting.
Possible causes
- Contact resistance in the connections
- Open circuit or short to ground or voltage in the signal wire
- Open circuit or short in the ground wire or power supply wire
- Incorrectly fitted engine speed (RPM) sensor
- Defective or damaged engine speed (RPM) sensor
- Damaged magnetic wheel
What you can do
- 1If you have a diagnostic tool, check in live data whether the engine speed appears while the starter motor cranks the engine
- 2Switch off the ignition and check the connectors to the control module and the sensor for contact resistance and oxidation
- 3Check that the sensor is correctly fitted and is not damaged or dirty
- 4Use a multimeter to check that the power, signal and ground wires to the sensor have no open circuit and no short to ground or voltage
- 5If no fault is found in the wiring, the sensor is the likely cause. Have a workshop confirm this and replace it if needed
Symptoms you may notice2
- The malfunction indicator lamp (MIL) is lit
- The engine cranks but does not start
General guidance for car owners. Diagnosis on the car can point to a different cause.