P25D1Exhaust Camshaft Actuator Park Lock Control Circuit Low (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P25D1 indicates that the control signal for the bank 1 exhaust phaser lock is too low, normally a grounded wire or a solenoid winding that leaks to ground. The exhaust side is the hotter one, so insulation that has hardened and cracked near the manifold or turbocharger is a typical finding. With the line grounded, the solenoid may stay powered and keep the pin retracted, or it never gets current, in which case the phaser stays locked. Either way the controller usually stops adjusting exhaust timing and falls back to a safe default. No public manufacturer document lists P25D1; the description follows the J2012 wording, CARB's requirement for circuit checks on output components and the general working of locking cam phasers.
- What you may notice
- Check engine lamp on
- Exhaust timing fixed, slightly less power
- Likely causes
- LikelyHeat-cracked insulation grounding the lock wire
- PossibleShorted exhaust lock solenoid
- RareEngine oil wicked into the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.