P2102: Throttle Actuator A Control Motor Circuit Low
Do not keep driving
Expect the engine to run at a fast idle and refuse to accelerate. Have it recovered rather than driven.
What this code means
The throttle motor circuit reads below its valid range, normally a short to ground. The module shuts its output stage down rather than continue feeding a short, so the motor stops and the plate returns to its spring default.
These motors are driven through an H-bridge — an arrangement that can push current either way through the winding, because the throttle has to be actively closed as well as opened rather than merely released. A short can therefore take out a driver stage in either direction, and both halves want measuring rather than one.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty throttle actuator motor · moderate
Less common
- Corroded or loose connector · easy
- Faulty engine control module · specialist
Symptoms
Components involved
Information, not instruction
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Community experience
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