VOLVO
ECM-P056171 - System Voltage Unstable. Mechanical Failures. Actuator stuck
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?
The ECM checks how the system relay operates. The fault is stored when the module detects voltage from the system relay while the relay is switched off, which suggests the relay has stuck in the energised position.
Possible causes
- The voltage wire is shorted to supply voltage
- The system relay is damaged
What you can do
- 1Check that the fuses are intact
- 2Check that the system relay is seated properly
- 3Look for chafed wiring on the voltage wire that may have touched a live supply
- 4If you have diagnostic equipment: activate the system relay and listen for a click when it is switched off and on
- 5If none of the checks show a fault, have a workshop replace the system relay, as a damaged relay is a possible cause
Symptoms you may notice1
- The engine does not start, hard to tell when it happens
General guidance for car owners. Diagnosis on the car can point to a different cause.