VOLVO
ECM-P065100 - Sensor Reference Voltage B Circuit/Open. 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?
Reference voltage B to the sensors has an open circuit. The ECM checks the internal supply circuits to the components, and the code is set when the module finds wrong voltage in one of them.
Possible causes
- Voltage cable to the sensor shorted to ground
- Voltage cable to the sensor shorted to supply voltage
- Damaged sensor
- Damaged engine control module (ECM)
What you can do
- 1Check that the fuses are intact
- 2Check that the battery is in good condition and that the charging system works
- 3With the ignition off, use a multimeter to check that the sensor wires have no open circuit and are not shorted to ground or supply voltage
- 4If you have diagnostic equipment, read the sensor values in live data and see whether any of them gives an implausible reading
- 5If the wiring and battery are in order but the fault remains, have a workshop check the engine control module and replace it if needed
Symptoms you may notice4
- Reduced performance
- The engine misfires
- The engine is difficult to start
- The starter motor does not turn, or turns but the engine does not start
General guidance for car owners. Diagnosis on the car can point to a different cause.