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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25AD

P25ADPiston Cooling Oil Control Circuit Stuck On

P25AD indicates that the engine control module (ECM) has commanded the piston cooling oil control circuit on, but the circuit feedback indicates it remains stuck in the on state. The ECM detects this by comparing the commanded state of the oil control solenoid or valve to the actual state reported by the circuit, and it sets the code when the circuit stays energized longer than expected.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
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.

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