OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P25AD?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySolenoid stuck open
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Piston Cooling Solenoid
Related codes
- P25A9Piston Cooling Oil Control Circuit/Open
- P25AAPiston Cooling Oil Control Circuit Low
- P25ABPiston Cooling Oil Control Circuit High
- P25ACPiston Cooling Oil Control Circuit Performance/Stuck Off
- P25AEPiston Cooling Oil Pressure Too Low
- P25AFCoolant Temperature Control Module Requested MIL Illumination
- P25B0Fuel Level Sensor A Stuck
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.