P25AE
Piston Cooling Oil Pressure Too Low
With the piston-cooling jets commanded on, the dedicated oil-pressure sensor in that gallery reads below the safe threshold. Insufficient flow to the jets means real piston cooling is not happening — the ECM warns the driver and may reduce torque to protect the pistons.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Low engine oil levelCommon
- Sludge-clogged oil galleryPossible
- Worn oil pumpLess likely
Parts involved
- Oil Pump
- Oil Gallery
- Piston Cooling Solenoid
P25AE is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.