What does code P252D mean?

Q: What does code P252D mean?

Engine Oil Quality Sensor Circuit High. P252D indicates that the engine control module has detected an abnormally high voltage on the engine oil quality sensor circuit, which typically means the sensor signal wire is shorted to power or the sensor's internal resistance has shifted out of range. The computer expects a voltage within a calibrated window that reflects the oil's dielectric properties, and a sustained high reading tells it the circuit is not behaving as designed.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P252D

P252DEngine Oil Quality Sensor Circuit High

P252D indicates that the engine control module has detected an abnormally high voltage on the engine oil quality sensor circuit, which typically means the sensor signal wire is shorted to power or the sensor's internal resistance has shifted out of range. The computer expects a voltage within a calibrated window that reflects the oil's dielectric properties, and a sustained high reading tells it the circuit is not behaving as designed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.