P2102Throttle Actuator A Control Motor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2102 means the output stage for throttle motor A sees a voltage or current that points to a short toward ground or an overloaded driver. GM lists P2100-P2103 together in its 2018 calibration as faults that limit engine power and default the throttle authority; a Bosch-based GM ECM of 2012 assigns its output-stage checks (short circuit, overtemperature or overcurrent, open load) to this group with about 0.1 s detection. Apart from such tables, no maker publicly documents P2102 on its own; many current ECUs report the same fault under P2100 with a failure-type byte. CARB requires circuit faults of output components to be detected. The throttle drops to limp position and power is cut. The high-side counterpart is P2103.
- What you may notice
- Limp mode with throttle at fixed opening
- Engine warning lamp on
- Pedal input largely ignored
- Likely causes
- LikelyMotor wire chafed through and shorted to ground
- PossibleShorted winding or jammed motor drawing excess current
- PossibleWater in the throttle connector bridging terminals
- RareFaulty throttle driver in the engine control unit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.