P212A code meaning
Throttle Position Sensor/Switch G Circuit
Powertrain system Generic code P21xx codes Check engine light
What P212A means
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.
P212A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P212A
- Engine warning lamp on
- Reduced power or limp mode
- Rough idle on twin-throttle engines
Common causes of P212A
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Throttle position sensor gElectronic throttle bodyECM
What each part of P212A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 2A | The exact fault in that area. |
What to do next
- Note P212A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P212A
What does P212A mean?
P212A means "Throttle Position Sensor/Switch G Circuit". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P212A?
Drive gently and only to a workshop. With P212A the car can go into limp mode (reduced power) to protect itself.
Will P212A fail an emissions test?
Yes, it can. P212A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P212A to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P212A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.