P1125 Throttle control motor circuit fault
P1125 means: Throttle control motor circuit fault. The electronic throttle opens and closes the air path into the engine. Drive gently and have the car checked soon. The repair usually costs about €80–500 in Estonia. The most common cause: throttle body clogged with carbon. Other possible causes: worn throttle motor or sensor, corroded connector.
What it means
The electronic throttle opens and closes the air path into the engine. The computer found that it doesn't move as commanded and often puts the car in limp mode.
This is a make-specific code (Toyota). The exact meaning can vary by model and year.
What you may notice
- Engine light on
- Limp mode
- The engine doesn't respond to the pedal properly
- Idle too high or too low
What could be wrong
- 1Throttle body clogged with carbon
- 2Worn throttle motor or sensor
- 3Corroded connector
- 4Low battery voltage
Repair difficulty: Moderate
What you can check yourself
Check whether the throttle body is dirty inside. After cleaning, the throttle has to be relearned with a diagnostic tool. You can check the simple things yourself, but the repair is best done in a workshop.
How we fix it
- We clean the throttle body and relearn it
- We check the connector and wiring
- We replace the throttle body if it's worn
Standard SAE description: Throttle Control Motor Circuit