OBD-II code · Powertrain (generic, extended)
P25E4 B Camshaft Position - Unable to Achieve Locked Position Bank 1
Camshaft phaser B on bank 1 cannot reach its base position at engine shutdown so the lock pin never engages. Next cold start may run rough until oil pressure builds.
Is it safe to drive with P25E4?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyWorn vanes or housing inside the phaser
- PossibleSludge or contaminated oil prevents return to base
- PossibleOil control valve leaks internally
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Cam Phaser B B1, Park Lock Pin, Oil Control Valve
Related codes
- P25DEA Camshaft Position - Unable to Achieve Locked Position Bank 1
- P25E1A Camshaft Position - Unable to Achieve Locked Position Bank 2
- P25E7B Camshaft Position - Unable to Achieve Locked Position Bank 2
- P25E2A Camshaft Position Control Performance Bank 2
- P25E3B Camshaft Position - Stuck In Locked Position Bank 1
- P25E5B Camshaft Position Control Performance Bank 1
- P25E6B Camshaft Position - Stuck In Locked Position Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.