A Camshaft Position - Unable to Achieve Locked Position Bank 1
Camshaft phaser A 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.
Affected components
- Cam phaser a b1
- Park lock pin
- Oil control valve
Common causes
- High likelihood: Worn vanes or housing inside the phaser
- Medium likelihood: Sludge or contaminated oil prevents return to base
- Medium likelihood: Oil control valve leaks internally
Possible symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.