Throttle Actuator Control System - Stuck Open
The throttle actuator is stuck open, restricting airflow.
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 pedal you use to accelerate communicates with the engine computer through sensors. When you press the pedal, the computer tells the throttle body to open and close to control the engine speed. If the throttle actuator is stuck open, it means the throttle is letting in too much air all the time, making it hard to control the engine speed.
What the computer is actually seeing
The engine control module (ECM) sees a position of the throttle actuator that is always reporting as wide open, even when it's not commanded to be. This affects how much air enters the engine, causing poor performance and possibly stalling.
What a healthy reading looks like
Throttle position sensor should report between 0-100% under normal operation. If the actuator is stuck open, readings will be at or near 100% constantly.
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.
- 1Visually inspect the throttle body and actuator for physical obstructions or carbon buildup. Clean if necessary and retest.
- 2Check wiring and connectors for the throttle position sensor and actuator for damage, corrosion, or loose connections. Repair or replace as needed.
- 3Use a scan tool to monitor throttle position while operating the vehicle. If TPS readings remain at 100% with no input, suspect a faulty TPS or throttle actuator.
- 4Test the throttle actuator to confirm it responds to commands. If it does not move or is slow to respond, replace the throttle body assembly.
Common causes
- Faulty throttle position sensor (TPS)
- Damaged or corroded wiring to throttle body
- Stuck throttle body due to carbon buildup
- Faulty throttle body actuator
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this fault code?
No, this code results in poor throttle control, making it unsafe to drive until repaired.
Will this code come back after repair?
If the underlying issue is fixed correctly, this code should not return.
Why do I see this code alongside P0220?
P0220 relates to the throttle position sensor circuit, which can also indicate that the throttle actuator issue is affecting sensor readings.
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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