P25D0Exhaust Camshaft Actuator Park Lock Control Circuit/Open (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
- P25D0 moves the open-circuit lock fault to the exhaust side: the solenoid that releases the locking pin of the bank 1 exhaust cam phaser can no longer be driven because its circuit is interrupted or reads implausibly. The lock keeps the exhaust cam at a defined position while the engine starts, before the phaser has enough oil pressure to hold itself. No manufacturer documents P25D0 publicly; GM's 2015 Volt table names only the intake lock codes, and BorgWarner's mid-position lock for the Hyundai Gamma II four-cylinder is fitted on the intake cam while the exhaust phaser has none. The background therefore rests on CARB's rules for variable valve timing and output circuits. Without lock control the exhaust timing stays fixed, which costs economy and raises emissions.
- What you may notice
- Check engine lamp on
- Slightly higher fuel consumption
- Rough idle possible
- Likely causes
- LikelyOpen winding in the exhaust phaser lock solenoid
- PossibleConnector damaged by exhaust heat
- PossibleBroken wire to the exhaust lock solenoid
- 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.