VOLVO
ECM-9A0C - Engine control module (ECM). Internal fault
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2005–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
What does this fault code mean?
The code comes from the engine control module's built-in monitoring of its internal voltage references. If any of them gives a fault, the code is set, which means the fault lies in the module. The malfunction indicator lamp lights when the fault is registered.
Possible causes
- The engine control module is damaged
What you can do
- 1After clearing, start the car and see whether the malfunction indicator lamp comes on again
- 2Check that the module connectors are fully seated and free from oxidation
- 3If the fault returns, the module is damaged and should be replaced; have a workshop do this
Symptoms you may notice1
- Malfunction indicator lamp (MIL) lights
General guidance for car owners. Diagnosis on the car can point to a different cause.