P2C17B Camshaft Profile Actuator Position Sensor B Range/Performance 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
- P2C17 flags implausible feedback from exhaust Hall sensor 2, the position sensor of the second exhaust profile actuator on bank 1 of GM's L3B. The electrical circuit tests pass, yet the shift pattern is wrong: after a command GM expects the reading to pass below 55 (pin extending), below 45 (pin fully out) and back above 68 (pin retracted). A missing step, or a pin event reported without any command, counts as a failure; four such readings in five, with the motor turning, supply over 11 V and crank and cam sensors fault-free, lead to a Type A code, MIL straight away (19OBDG03D, 25OBDG03B). The harness bulletins only carry P2C17 in their keyword lists. Because CARB requires a single lift pin that fails to move to be caught, the engine falls back to a fixed exhaust profile. Look at oil condition and actuator 2 first.
- What you may notice
- Warning lamp on without delay
- Engine runs on a fixed exhaust profile, no cylinder deactivation
- Possibly a light tapping noise from the valve train
- Likely causes
- LikelyPin of exhaust actuator 2 binding because of deposits or degraded oil
- PossibleExhaust cam sleeve not snapping into its detent, worn groove
- RareLow or aerated engine oil slowing the shift
- 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.