Powertrain
generic / SAE
P03EF
A Camshaft Profile Actuator C Control Performance/Stuck Off (Bank 1)
Cam profile actuator A position C is electrically OK but does not engage when commanded. The cam phaser actuator adjusts intake/exhaust timing under load — a stuck or slow phaser kills mid-rpm torque and can throw correlation codes between cam and crank.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / EF
Possible causes
- Lock pin or oil supply restricted high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–2000 €
- Estimated time: 1.5–5 h
- Component: camshaft position actuator
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012