VOLVO
ECM-341A - Rear knock sensor (KS). Too little roar
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:
3 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008)
Show models by year and engine (12)
- Volvo S60 (2001–2009)2001Engine B5244S, B5244S2 only
- Volvo S60 (2001–2009)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2006–2008Engine B5244SG only
- Volvo S80 (1999–2006)2001Engine B5244S, B5244S2, B5244SG only
- Volvo S80 (1999–2006)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2006Engine B5244SG only
- Volvo V70 (2000–2008)2001Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (2000–2008)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2003–2005Engine B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2006–2008Engine B5244SG only
What does this fault code mean?
The signal from the rear knock sensor is too low. The control module checks the signal against limits that depend on engine speed, and the code is set when the signal falls outside them.
Possible causes
- Contact resistance in the connector
- Defective knock sensor
What you can do
- 1Clear the code and road test the car to see whether it returns
- 2Check the rear knock sensor connector: fully seated, clean and free from oxidation
- 3Use a multimeter to check that the wire to the rear knock sensor is intact
- 4If you have a diagnostic tool: see whether the knock signal in live data changes as engine speed rises
- 5If the connector is clean but the fault remains, have a workshop fit a new knock sensor
Symptoms you may notice1
- The engine performs worse
What the fault can affect2
- Knock control is disabled
- Ignition timing is retarded for safety reasons
General guidance for car owners. Diagnosis on the car can point to a different cause.