P2C1AB Camshaft Profile Actuator Position Sensor C Circuit 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
- P2C1A would report an open circuit in a third position feedback on the bank 1 exhaust camshaft. No manufacturer documents this code publicly. GM's L3B, the one engine with publicly documented exhaust feedback codes, has just two exhaust Hall sensors (P2C12 to P2C19), in line with the two exhaust profile actuators that GM TechLink describes; its 2019 and 2025 tables contain no P2C1A. A system with a third exhaust actuator would test it as with the analogous code P2C16: an energised driver and a very high signal-to-ground impedance pointing to a broken wire. CARB requires such sensors and actuators of a valve lift system to be monitored for circuit faults. Expect a warning lamp and a locked exhaust lift profile.
- What you may notice
- Engine warning lamp on
- Exhaust cam profile switching locked out
- Likely causes
- LikelyDisconnected or corroded plug at the third exhaust actuator
- PossibleBroken feedback wire in the engine harness
- RareInternal open in the position sensor
- 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.