Powertrain
generic / SAE
P25AD
Piston Cooling Oil Control Circuit Stuck On
The piston cooling solenoid does not close when commanded off — jets remain active when not needed. Oil pressure to top-end consumers may sag, and warm-up takes longer because the cooling jets remove heat from the pistons during cold start.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / AD
Possible causes
- Solenoid stuck open high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 300–1500 €
- Estimated time: 1.5–5 h
- Component: piston cooling solenoid
- MIL / check engine light
Sources
References
sae:J2012