What does code P25AA mean?

Q: What does code P25AA mean?

Piston Cooling Oil Control Circuit Low. P25AA indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current on the piston cooling oil control circuit, which typically controls a solenoid valve that sprays oil onto the underside of the pistons to manage temperature. The PCM monitors the circuit and sets this code when the signal falls below the expected range, indicating a short to ground, an open circuit, or a faulty component.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25AA

P25AAPiston Cooling Oil Control Circuit Low

P25AA indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current on the piston cooling oil control circuit, which typically controls a solenoid valve that sprays oil onto the underside of the pistons to manage temperature. The PCM monitors the circuit and sets this code when the signal falls below the expected range, indicating a short to ground, an open circuit, or a faulty component.

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.