P212D code meaning
Throttle Position Sensor/Switch G Circuit High
Powertrain system Generic code P21xx codes Check engine light
What P212D means
P212D is the high-voltage fault on throttle position signal G. GM documents it in the 2023 and 2024 tables (23OBDG07, 24OBDG07) for sensor 2 of the bank 2 throttle body on a twin-throttle engine: once the raw voltage climbs above 4.805 V for 0.14 s, the code is stored in a single trip. A reading that close to the supply rail usually points to an open sensor ground, an interrupted signal line that the input pulls up, or a short to the 5 V reference or battery voltage. Because both sensors of one throttle often share their ground, P212D can appear alongside a high fault on the first sensor of that throttle. P212C is the low counterpart, P212A the general circuit code. Expect a warning lamp and reduced power.
P212D 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 P212D
- Engine warning lamp on
- Reduced engine power message
- Weak or delayed response to the accelerator
Common causes of P212D
- Most likelyOpen sensor ground at the bank 2 throttle body
- PossibleSignal wire of sensor G shorted to 5 V reference or battery voltage
- PossibleBroken signal wire or pushed-back terminal
- Less likelyInternal fault in the position sensor of the bank 2 throttle
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 body
What each part of P212D 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. |
| 2D | The exact fault in that area. |
What to do next
- Note P212D 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 P212D
What does P212D mean?
P212D means "Throttle Position Sensor/Switch G Circuit High". P212D is the high-voltage fault on throttle position signal G. It is a generic code, so it means the same on every make.
Is it safe to drive with P212D?
Drive gently and only to a workshop. With P212D the car can go into limp mode (reduced power) to protect itself.
Will P212D fail an emissions test?
Yes, it can. P212D 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 P212D 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 P212D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.