P2C08A Camshaft Profile Actuator Position Sensor A Circuit High 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
- P2C08 flags a short to voltage on position sensor A, the Hall feedback of the first intake profile actuator on bank 1. GM's L3B 2.7 L four runs this check the other way round from the ground test: the output stage is switched off, and if the line still shows 0.5 ohm or less towards controller power, 4 of 5 such readings above 11 V store a Type A code with immediate MIL (19OBDG03D, again 25OBDG03B). Unlike the ground fault P2C07, P2C08 sits in the main code list of GM bulletins PIT5677 (2019) and 21-NA-149 (2019 to 2021 Silverado and Sierra 1500), which blame engine harness damage over the camshaft carrier and near the left shock tower and mention blown fuses. Lift switching stops until the fault is cleared. Open circuit: P2C05.
- What you may notice
- MIL lit immediately
- No valve lift change and no cylinder deactivation
- After harness damage also rough running, reduced power or no start
- Likely causes
- LikelyChafed engine harness touching a live circuit (GM bulletins PIT5677, 21-NA-149)
- PossibleInternal short to supply inside the actuator or its feedback element
- RareFaulty output stage in the ECM
- 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.