Powertrain, generic (extended)

P212D Throttle Position Sensor/Switch G Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Open sensor ground at the bank 2 throttle body
Signal wire of sensor G shorted to 5 V reference or battery voltage
Broken signal wire or pushed-back terminal
Internal fault in the position sensor of the bank 2 throttle

Symptoms

  • Engine warning lamp on
  • Reduced engine power message
  • Weak or delayed response to the accelerator

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–700
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

throttle position sensor gelectronic throttle body

Related codes

P212AP212BP212CP212EP212FP0223

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.