P25D3
Exhaust Camshaft Actuator Park Lock Control Circuit / Open Bank 2
The controller cannot drive the park-lock pin that secures the exhaust camshaft phaser on bank 2 in its base position at engine off. Without the lock, the next start can suffer poor combustion or rough idle until the phaser builds oil pressure.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Common causes
Ordered by how often each turns out to be the cause.
- Open coil in the park-lock solenoidCommon
- Broken control wire between ECU and solenoidPossible
Parts involved
- Exhaust Cam Phaser B2
- Park Lock Solenoid
- Wiring Harness
P25D3 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.