P2100critical severityPowertrain
Throttle Actuator Control Motor Circuit Open
on 2017 GMC Acadia 3.6L V6 · FWD
What this code means
Open circuit detected in the electronic throttle body motor drive circuit.
Symptoms
- Reduced power/limp mode
- Check engine light
- Throttle unresponsive
- Engine may not rev above idle
Common causes
- Failed throttle body motor
- Broken wiring
- Corroded connector
- ECM driver failure
Diagnostic steps
- Check throttle body connector
- Measure motor resistance (2-7 ohms typical)
- Inspect wiring to ECM
- Test ECM motor driver output
Repair notes
Replace throttle body assembly or repair wiring. ECM replacement rarely needed.
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