P2100 – Throttle Actuator ‘A’ Control Motor Circuit Open
Description
The ECM detects an open control circuit in the throttle actuator motor, preventing the electronic throttle body from operating normally.
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Compare Diagnostic ScannersSymptoms
- No throttle response
- Limp mode
- Rough or unstable idle
- Engine may stall
- Check Engine light
Causes
- Open or corroded wiring
- Faulty throttle actuator motor
- Faulty accelerator pedal position sensor
- PCM/ECM driver failure
- Poor ground connection
Diagnosis
- Inspect wiring and connectors
- Measure voltage and resistance at the actuator motor
- Test accelerator pedal position sensor
- Check fuses and relays
- Verify PCM/ECM output signals
Repair
- Repair or replace damaged wiring
- Replace throttle actuator / throttle body
- Replace accelerator pedal position sensor
- Repair or replace PCM/ECM
- Clear codes and perform road test
