Throttle Actuator Control System - Forced Limited Power
Engine power is limited due to a fault in the throttle control system.
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 car's computer is detecting an issue with the throttle system, which controls how much air enters the engine; this limits power to protect the engine.
What the computer is actually seeing
The PCM monitors the throttle position sensor and the throttle actuator position. It detects discrepancies, such as when the throttle is not responding correctly within expected parameters, usually seeing unexpected voltage values or position readings.
What a healthy reading looks like
Throttle position sensor voltage should be 0.5V to 4.5V at idle to wide open throttle; expected actuator response should match requested positions.
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 physical damage or obstructions. Decision: Is it damaged? (Yes: Replace throttle body; No: Continue.)
- 22. Check wiring and connectors between the throttle body and PCM for wear, fraying, or corrosion. Decision: Are connections clean and secure? (No: Repair/replace connectors; Yes: Continue.)
- 33. Using a scan tool, monitor throttle position sensor data. Record voltage at idle and full throttle. Decision: Are values within expected range? (No: Replace throttle position sensor; Yes: Continue.)
- 44. Clear the code and perform a test drive to see if the code returns. Decision: Does the code reappear? (Yes: Replace throttle body; No: Issue resolved.)
Common causes
- Faulty throttle body
- Damaged wiring or connectors to throttle body
- Failed throttle position sensor
- PCM software issue
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but with limited power, so avoid high-speed driving or heavy loads.
Will the code come back?
If the underlying issue isn't fixed, yes, the code is likely to return.
Why might this code pair with others?
It often pairs with throttle position sensor faults or related actuator 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.
Start guided diagnostic →