P2108 Throttle actuator: reading or operation not right (control module)

By: Diagno editorial team · Updated: 2026-10-15

P2108 means: Throttle actuator: reading or operation not right (control module). 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.

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. There is a signal, but the reading or operation isn't plausible. The cause may be the part itself or a real mechanical fault.

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

1. 1Throttle body clogged with carbon
2. 2Worn throttle motor or sensor
3. 3Corroded connector
4. 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

1. We clean the throttle body and relearn it
2. We check the connector and wiring
3. We replace the throttle body if it's worn

Standard SAE description: Throttle Actuator Control Module Performance