VOLVO
ECM-P252E85 - Engine Oil Quality Circuit Intermittent/Erratic. Bus Signal / Message Failures. Signal above allowable range
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (6)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 only
- Volvo XC60 (2009–)2009All engines except: B6304T2
- Volvo XC70 (2008–)2008All engines except: B6324S
- Volvo XC70 (2008–)2009Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2013–2014Engine D5244T18, D5244T5 only
What does this fault code mean?
Although the code is named a bus or message fault, it concerns the diesel concentration in the engine oil. During particle filter regeneration some diesel can dilute the oil, and the ECM calculates how much diesel is added to it. The code is stored when the concentration exceeds a certain value, and the causes are too high a diesel content in the oil or a supply short-circuited to ground.
Possible causes
- Too high a concentration of diesel in the engine oil
- Voltage supply short-circuited to ground
What you can do
- 1Check the oil level with the dipstick; it rises when the engine oil is diluted with diesel
- 2Change the engine oil. An excessive diesel content in the engine oil can damage the engine's components
- 3If this code is stored together with an oil level code, fault-trace them together, since they can have the same cause
- 4Use a multimeter to check that the supply to the sensor is not short-circuited to ground (body)
- 5If the fault remains after the oil change, have a workshop check the diesel content and the sensor
Symptoms you may notice1
- Text message in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.