P0025"B" Camshaft Position - Timing Over-Retarded (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The engine control module compares the commanded position of the exhaust camshaft on bank 2 with the actual position from the camshaft and crankshaft sensors. This code is set when the camshaft stays further retarded than commanded for longer than a calibrated time. Usually the phaser does not move far enough out of its rest position, because oil pressure is too low to release the locking pin, the oil control valve does not open, or the oil screen is blocked. A stretched timing chain also shifts the camshaft towards retarded. Bank 2 exists only on V and boxer engines; it is the cylinder bank without cylinder 1.
- What you may notice
- Check engine light on
- Noticeably less torque and pulling power
- Higher fuel consumption
- Harder starting in some cases
- Rattle from the timing drive if the chain is stretched
- Likely causes
- LikelyOil pressure or oil level too low, oil worn out
- LikelyOil control valve sticking closed or its screen blocked
- PossibleCam phaser defective or seized in its rest position
- PossibleTiming chain stretched or jumped a tooth
- RareWear debris in the oil circuit, e.g. from a thrust bearing
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.