P2C12B Camshaft Profile Actuator Position Sensor A 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
- Camshaft B is the exhaust camshaft in J2012 terms, and P2C12 reports an open circuit in the feedback of its first profile actuator on bank 1. GM's 2.7 L turbo L3B (Silverado and Sierra 1500 from model year 2019) is the documented user: its tables call this element exhaust Hall sensor 1. With the driver energised, the ECM flags a break once the signal-to-ground impedance reaches 200 kilohms or more; four failures out of five samples at system voltage above 11 V give a Type A code, MIL on trip one (19OBDG03D, 25OBDG03B). P2C12 is in the main DTC list of PIT5677 and its successor 21-NA-149, which point to engine harness damage at the camshaft carrier cover. Exhaust lift changes are then suspended. Low and high: P2C14, P2C15.
- What you may notice
- Check engine light from the first trip
- Exhaust cam profile no longer switched, fuel economy mode unavailable
- With harness damage, several other engine codes at the same time
- Likely causes
- LikelyEngine harness worn through where it crosses the camshaft carrier cover (GM PIT5677, 21-NA-149)
- PossibleConnector on exhaust actuator 1 not latched or corroded
- RareOpen Hall element inside the exhaust actuator
- 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.