P212AThrottle Position Sensor/Switch G Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P212A is the general circuit code for throttle position signal G, a letter that only comes into play on engines with more than one electronic throttle or extra position tracks. No manufacturer documents P212A publicly. GM's 2023 table 23OBDG07 assigns G to the second position sensor of the bank 2 throttle body on a twin-throttle engine, but reports its electrical faults through the separate codes P212C (below 0.195 V) and P212D (above 4.805 V), each after 0.14 s in one trip. CARB requires input components like this to be checked for circuit faults, and P212A is the catch-all slot for that duty. Check the connector, wiring and 5 V supply at the second throttle body. P212B covers plausibility, P212C-P212E low, high and intermittent faults.
- What you may notice
- Engine warning lamp on
- Reduced power or limp mode
- Rough idle on twin-throttle engines
- Likely causes
- LikelyOpen or short in the sensor G signal, supply or ground wire
- PossibleCorroded or loose connector at the throttle body
- PossibleFailed position sensor inside the throttle body
- 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.