VOLVO
ECM-P00C374 - Turbocharger/Supercharger Bypass Valve "B" Control Circuit Range/Performance. Mechanical Failures. Actuator slipping
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (8)
- Volvo S60 (2011–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo S80 (2007–)2014–2015Engine B4204T11, B4204T12, B4204T15 only
- Volvo V40 (2013–)2015Engine B4204T11 only
- Volvo V40 Cross Country (2013–)2015Engine B4204T11 only
- Volvo V60 (2011–)2014–2015Engine B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo V70 (2008–)2014–2015Engine B4204T11 only
- Volvo XC60 (2009–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11 only
What does this fault code mean?
The engine control module (ECM) compares the bypass valve position with the position it requests. The code is stored when the difference is too large during control, with the engine running. It is a mechanical fault in the valve actuator, meaning the valve does not follow the control as it should. The valve may be damaged or dirty.
Possible causes
- Compressor bypass valve is damaged
- Compressor bypass valve is dirty
What you can do
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check the connections to the bypass valve: they should be fully seated and free from corrosion
- 3Look for dirt or sticking in the bypass valve and the compressor throttle, and clean them if necessary
- 4Have a workshop check the valve actuator with diagnostic equipment if the fault remains
Symptoms you may notice2
- The engine lacks power and runs poorly
- The engine hesitates or runs unevenly, especially when slowing down
General guidance for car owners. Diagnosis on the car can point to a different cause.