VOLVO
ECM-2337 - Cylinder #2 Above Knock Threshold
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
What does this fault code mean?
Knock in cylinder 2 has grown more frequent than the engine control module (ECM) allows, and it then adjusts the ignition so the knock eases. The knock sensor on the engine block is what registers the combustion knock. The cause may be fuel quality, a lean mixture or an overheating engine.
Possible causes
- Engine running on a lean fuel/air mixture
- Poor fuel quality, for example summer fuel in winter
- Engine running too hot
- Intake air temperature too high
- Knock sensor fitted loosely
- Damaged knock sensor
What you can do
- 1Read and clear the code, then road test and listen for knocking from the engine
- 2Fill up with petrol suited to the season, since the wrong fuel quality can cause knock
- 3Check that the connector to the knock sensor is secure
- 4If you have a diagnostic tool: look at the ignition timing adjustment in live data and see whether it is pulled back when the engine knocks
- 5If the fault remains, have a workshop judge whether the knock sensor needs replacing
Symptoms you may notice1
- Poor performance
General guidance for car owners. Diagnosis on the car can point to a different cause.