Throttle Actuator Control System - Forced Idle
The throttle actuator is stuck or not responding, leading to limp mode.
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 computer is telling the throttle body to limit airflow because it can't control it properly. It's like if you told someone to slow down while driving, and they didn't respond properly, so you just made them idle at the side of the road.
What the computer is actually seeing
The engine control module (ECM) sees a fault in the throttle actuator position, indicating it can't achieve the desired position for airflow control. This can cause decreased engine power.
What a healthy reading looks like
The expected throttle position should normally be between 10% to 90% during acceleration under load. If the signal is either stuck at 0% or 100%, or there's a delay of more than 100 ms in response, it triggers this code.
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.
- 1Check all wiring and connectors to the throttle body for damage or corrosion.
- 2Clear the code and take the vehicle for a drive to see if it returns immediately.
- 3Check the throttle position sensor (TPS) output with a multimeter; it should vary smoothly between 0.5V (idle) and 4.5V (full throttle).
- 4Inspect the throttle body for dirt or carbon build-up that could cause binding in the actuator.
- 5If all checks are good, replace the throttle body as the final step.
Common causes
- Faulty throttle body
- Bad throttle position sensor (TPS)
- Wiring issues to the throttle actuator
- Vacuum leaks affecting airflow
- Software glitch in the ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, you may experience limp mode or reduced engine power, so it's best to repair this immediately.
Will this code clear itself?
It might clear if the issue resolves, but it's likely to return if the underlying problem isn't fixed.
Why does it pair with other throttle codes?
Throttle control issues are often linked; multiple codes can indicate a systemic problem within the throttle system.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →