P2C09A Camshaft Profile Actuator Position Sensor B 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
- Position sensor B belongs to the second of the four intake actuators that slide the cam sleeves on GM's L3B; GM's tables call it intake Hall sensor 2. The sensors are thus one per actuator, not one per lift step: sensors A to C get J2012 codes, while GM puts the fourth (sensor D) under its own codes P30B0 to P30B3. P2C09 is the open-circuit test for sensor B. With the output energised the ECM expects a low impedance; 200 kilohms or more between signal and ground in 4 of 5 samples, supply above 11 V, set a Type A fault (19OBDG03D, 25OBDG03B). GM bulletins PIT5677 and 21-NA-149 list P2C09 for L3B trucks with chafed harnesses. Without feedback the ECM cannot confirm shifts, so lift switching is disabled. Low and High are P2C0B and P2C0C.
- What you may notice
- Check engine light on in the first trip
- Lift switching and cylinder deactivation locked out
- Usually no noticeable change in driving apart from fuel use
- Likely causes
- LikelyLoose, unplugged or corroded connector on actuator 2
- PossibleWire broken by harness chafing on the camshaft carrier (GM L3B bulletins)
- PossibleOpen circuit inside the actuator or its Hall element
- 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.