P2C16B 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
- P2C16 is the open-circuit fault of position sensor B on the bank 1 exhaust camshaft. On GM's L3B this is exhaust Hall sensor 2, the second and last exhaust feedback: GM's tables list four exhaust pin drivers (control codes P002A, P2B39, P03F1, P3099) but only two exhaust Hall elements, which matches the two exhaust profile actuators described by GM TechLink. The ECM energises the driver and treats 200 kilohms or more from signal to ground in four out of five samples above 11 V as an open circuit, Type A, MIL immediately (19OBDG03D, 25OBDG03B). P2C16 is part of the main DTC list of PIT5677 and 21-NA-149. Possible causes are a pulled connector, a broken wire or an open Hall element; until fixed, exhaust lift switching is disabled.
- What you may notice
- Check engine light in the first trip
- Exhaust lift switching and economy modes blocked
- Likely causes
- LikelyPlug on exhaust actuator 2 pulled off or not locked after engine work
- PossibleWire broken where the harness rubs at the camshaft carrier (GM L3B bulletins)
- RareOpen circuit in the Hall element of actuator 2
- 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.