P2100 — Throttle Actuator Control Motor Circuit/Open
Moderate severityWhat it means
P2100 is stored when the engine control unit sees a fault involving the throttle actuator control motor circuit. On a drive-by-wire engine the throttle actuator motor opens and closes the throttle plate; the control unit drives this motor and monitors its circuit. The “open” status means the control circuit is electrically broken — usually a cut wire, an unplugged connector or a failed driver.
Common symptoms
- The component does not respond to commands
- Reduced power or limp mode
- Poor or no throttle response
- Unstable idle
Likely causes
- Open or broken wire in the control circuit
- Unplugged or corroded connector
- A failed throttle body/actuator motor
- A wiring, connector or driver-circuit fault
What to check first
- Check circuit continuity and connector pins with the key off
- Watch commanded vs actual throttle position in live data
- Inspect the throttle body connector and consider a relearn
Can you keep driving?
Drive-by-wire faults usually force reduced power; have it checked promptly as throttle response can be unpredictable.
Frequently asked questions
What is the most common cause of P2100?
The most likely cause is: Open or broken wire in the control circuit. Several other faults can set P2100 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P2100 and keep driving?
Clearing P2100 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P2100?
P2100 is a moderate-severity code. The car is often still drivable, but have it diagnosed soon — the underlying problem can get worse and it may fail an emissions test.
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