Powertrain
generic / SAE
P25A9
Piston Cooling Oil Control Circuit/Open
The piston-cooling oil-jet control circuit is open. Modern engines with under-piston oil jets switch them on under high load to cool the piston crown — controlled by a solenoid valve in the oil gallery. With the circuit broken, jets cannot be commanded on or stay locked off, raising piston temperatures under load.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / A9
Possible causes
- Open control wire to the solenoid high
- Open solenoid coil medium
- Pin pushed back out of connector body low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–4 h
- Component: piston cooling solenoid
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012