Powertrain, generic (extended)

P212C Throttle Position Sensor/Switch G Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Signal wire of sensor G shorted to ground
5 V reference to the bank 2 throttle body open or pulled low
Worn or damaged track of position sensor G inside the throttle body
Corroded or loose terminals at the bank 2 throttle connector

Symptoms

  • Engine warning lamp on
  • Reduced engine power message
  • Uneven idle or hesitation on one bank

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

P212AP212BP212DP212EP212FP0222

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