VOLVO
ECM-P250400 - Charging System Voltage High. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsS60 (2011–), S80 (2007–), V70 (2008–)
Show models by year and engine (9)
- Volvo S60 (2011–)2011–2012Engine B5254T5 only
- Volvo S80 (2007–)2007–2008Engine B5254T6 only
- Volvo S80 (2007–)2009Engine B5254T6, B5254T8 only
- Volvo S80 (2007–)2010–2011Engine B5254T10, B5254T11, B5254T8 only
- Volvo S80 (2007–)2012Engine B5254T10 only
- Volvo V70 (2008–)2008Engine B5254T6 only
- Volvo V70 (2008–)2009Engine B5254T6, B5254T8 only
- Volvo V70 (2008–)2010–2011Engine B5254T10, B5254T11 only
- Volvo V70 (2008–)2012Engine B5254T10 only
What does this fault code mean?
Through CAN communication, the central electronic module (CEM) informs the engine control module about overvoltage in the power supply system, and the code is then stored. The code is always stored together with another code for the power supply system, so both should be included in the fault-tracing.
Possible causes
- A charger delivering excessive charge voltage was connected earlier
- Damaged alternator control module (ACM, charge regulator)
What you can do
- 1Read all fault codes in the control modules and identify those belonging to the power supply; fault-trace them together with this code
- 2If you have a diagnostic tool, read the battery voltage with the engine running and see whether it seems high compared with what is normal
- 3Ask yourself whether a battery charger has been connected to the battery before; a charger with too high charge voltage can cause this code
- 4If the overvoltage remains after these checks, have a workshop try a new control module for the generator
Symptoms you may notice2
- The electrolyte in the battery boils with the engine running
- The headlamp bulb blows
General guidance for car owners. Diagnosis on the car can point to a different cause.