P03F1B Camshaft Profile Actuator C Control Circuit/Open 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 exhaust camshaft (camshaft B) 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). P03F1 means the actuator's control circuit is open: GM checks the circuit with the driver on and sets the code at an impedance of 200 kΩ or more (4 of 5 samples, above 11 V, MIL on the first trip). The actuator can then not shift its cam piece, and lift switching and cylinder deactivation are blocked.
- What you may notice
- Check engine light on
- Lift switching and cylinder deactivation blocked, higher consumption
- Possibly rough running if a cam piece stays in the wrong position
- Likely causes
- LikelyActuator connector loose, corroded or pin pushed back (often after valve cover work)
- PossibleActuator solenoid open
- PossibleWire broken in the engine harness
- RareDriver in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.