P212CThrottle Position Sensor/Switch G Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P212C sets when position signal G reads below its lower electrical limit. The letter G only comes into play on engines with more than one electronic throttle. GM's 2023 and 2024 OBD tables (23OBDG07, 24OBDG07) give it to the second position sensor in the bank 2 throttle body of a twin-throttle engine: a raw voltage under 0.195 V lasting 0.14 s while the ECU is running stores the code within one trip. Usual culprits are a signal wire shorted to ground, a lost 5 V feed to that throttle body or a damaged sensor track. P212D is the matching high fault, P212A the general circuit code, P212B the plausibility check of G. Once a bank 2 signal is lost, the ECU typically restricts power.
- What you may notice
- Engine warning lamp on
- Reduced engine power message
- Uneven idle or hesitation on one bank
- Likely causes
- LikelySignal wire of sensor G shorted to ground
- Possible5 V reference to the bank 2 throttle body open or pulled low
- PossibleWorn or damaged track of position sensor G inside the throttle body
- RareCorroded or loose terminals at the bank 2 throttle connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.