OBD-II code · Powertrain (generic, extended)
P25AB Piston Cooling Oil Control Circuit High
Control circuit stuck high — short to battery voltage or open coil/return. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P25AB?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyControl wire shorted to battery voltage
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Piston Cooling Solenoid
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.