P212E Throttle Position Sensor/Switch G Circuit Intermittent

P212E is reserved for brief dropouts or spikes on throttle position signal G, the kind that clear again before a steady low or high fault can be confirmed. No manufacturer documents this code publicly. GM, which assigns G to sensor 2 of the bank 2 throttle body on a twin-throttle engine, reacts to such glitches with its range checks instead: P212C below 0.195 V and P212D above 4.805 V each need only 0.14 s. CARB requires input sensors to be monitored for circuit faults, which is the duty this slot covers. In practice the trigger is a loose terminal, a chafed wire near the engine or moisture in the connector. Check the harness while flexing it with the engine running. The fault may vanish between workshop visits.

Likely causes

Symptoms

• Warning lamp that comes and goes
• Brief stumbles or power dips
• Fault often not present at the workshop

Repair estimate

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

Parts involved

Related codes

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