VOLVO
ECM-P055A2F - Engine Oil Pressure Sensor/Switch "B" Circuit. General Signal Failures. Signal erratic
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, D4204T5 only
- Volvo S80 (2007–)2014–2015Engine B4204T11, B4204T12, B4204T15, D4204T5 only
- Volvo V40 (2013–)2015Engine B4204T11, D4204T14 only
- Volvo V40 Cross Country (2013–)2015Engine B4204T11, D4204T14 only
- Volvo V60 (2011–)2014–2015Engine B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo V70 (2008–)2014–2015Engine B4204T11, D4204T5 only
- Volvo XC60 (2009–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11, D4204T5 only
What does this fault code mean?
The ECM reads oil pressure through the combined oil pressure and oil temperature sensor. The fault is stored when the module detects a general signal fault from the oil pressure sensor, where the signal is erratic and not steady. The module then uses a fixed oil pressure value instead of the measured one.
Possible causes
- Contact resistance or oxidation in the connections
- The combined oil pressure and oil temperature sensor is damaged
What you can do
- 1Check that the fuses are intact
- 2Check the connector at the oil pressure sensor for contact resistance and oxidation, and see whether it sits loose
- 3If the connector is clean, use a multimeter to check that the signal wire from the sensor has no open circuit or short to ground
- 4If you have diagnostic equipment: read the oil pressure in live data with the engine running and see whether the value jumps around erratically
- 5If the connector and wiring are sound, have a workshop check the combined sensor and replace it if needed
Symptoms you may notice1
- No noticeable symptoms for the driver
What the fault can affect1
- The control module uses a fixed oil pressure instead of the measured value
General guidance for car owners. Diagnosis on the car can point to a different cause.