Throttle Actuator Control System - Stuck Closed
The throttle actuator is not responding correctly and is stuck in a closed position.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The throttle actuator is supposed to open and close to adjust the engine's air intake. If it gets stuck closed, the engine won’t get enough air, affecting performance and potentially stalling the vehicle.
What the computer is actually seeing
The engine control module (ECM) detects that the throttle position is not changing when commanded. It expects a response based on throttle position sensor inputs but sees a constant low voltage or signal indicating closed throttle.
What a healthy reading looks like
Throttle position sensors should read 0% to 100% based on pedal input; typically, the closed position is around 0.5V (0%) and wide open around 4.5V (100%).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the throttle body for carbon build-up or physical obstructions. Clean if needed. Decision Point: Does it operate smoothly after cleaning? Yes = end; No = continue.
- 22. Check the electrical connector at the throttle actuator for corrosion or damage. Ensure it's secure. Decision Point: Is the connector in good shape? Yes = continue; No = repair/replace connector.
- 33. Measure the voltage at the throttle actuator connector with key on, engine off. Expected should be around 0.5V closed. Decision Point: Are values within specifications? Yes = continue; No = repair wiring or replace actuator.
- 44. Test the throttle position sensor using a scan tool or multimeter while moving the throttle. Values should rise from 0.5V to 4.5V smoothly. Decision Point: Is it responsive? Yes = replace actuator; No = replace throttle position sensor.
Common causes
- Faulty throttle actuator
- Damaged wiring or connectors
- Contaminated throttle body
- Faulty throttle position sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, this code indicates the throttle is stuck closed which can lead to stalling and loss of vehicle control.
Will this code come back after clearing it?
Yes, if the underlying issue isn't fixed, the code can return.
Why does this code often pair with P2111?
P2111 is related and indicates a different problem in the throttle control system, often occurring alongside P2112 due to similar issues.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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