Powertrain, generic (extended)

P212A Throttle Position Sensor/Switch G Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Open or short in the sensor G signal, supply or ground wire
Corroded or loose connector at the throttle body
Failed position sensor inside the throttle body

Symptoms

  • Engine warning lamp on
  • Reduced power or limp mode
  • Rough idle on twin-throttle engines

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 bodyecm

Related codes

P212BP212CP212DP212EP212F

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