09 tc DTC appears after Buick LaCrosse cleans the throttle.

The throttle is out of order If this happens, the solution steps are as follows:

1. Read the fault code with the diagnostic computer. If there is a throttle fault, match the throttle first.

2. Buick LaCrosse should be equipped with throttle after cleaning the throttle, otherwise the idle speed will be high. It will light the fault light.

3. If the fault light does not go out after matching the throttle, use the computer to clear the fault.