P25DD
A Camshaft Position - Stuck In Locked Position Bank 1
Camshaft phaser A on bank 1 will not unlock from its base position. The phaser stays at the park-lock angle and cannot be advanced or retarded as commanded.
- 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.
- Park-lock pin stuck in the locked grooveCommon
- Low oil pressure cannot push the lock pin outPossible
- Oil control valve blocked by debrisPossible
Parts involved
- Cam Phaser A B1
- Park Lock Pin
- Oil Control Valve
P25DD 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.