P03F0A Camshaft Profile Actuator C Control Stuck On Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With a sliding camshaft, the intake camshaft (camshaft A) carries movable cam pieces with several lift profiles; solenoid actuators shoot a pin into a groove in the piece and shift it axially. Actuator C is the third of these actuators – not a profile position. The only known user is GM's 2.7-litre turbo four (L3B, three-step sliding cam, from model year 2019). P03F0 means the actuator stays on: its pin remains extended although it was commanded off. GM checks whether the pin returns past its retraction threshold by the end of the engine cycle; a single failure in 5 samples sets the code (MIL on the first trip), because a pin left extended can drag in the groove and shift the piece wrongly.
- What you may notice
- Check engine light on
- Ticking or rattling at the camshaft carrier
- Misfire, rough idle or less power in the wrong lift profile
- Lift switching and cylinder deactivation out of service
- Likely causes
- LikelyPin sticking in the actuator (sludge, wear)
- PossibleReturn ramp of the shift groove damaged or cam piece sticking
- PossibleSolenoid stays energized (control wire shorted to ground)
- RareHall feedback faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €200 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.