P052B
Cold Start A Camshaft Position Timing Over-Retarded Bank 1
Same as P052A with the phaser stuck retarded - cold-start strategy cannot pull the cam to the advanced position needed for fast catalyst light-off.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
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.
- Phaser stuck in retarded positionCommon
Parts involved
- Cam Phaser A B1
- Oil Supply
P052B 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.