CDC0
ModerateCDC0 — Throttle Body Actuator Failure
Description
What CDC0 Means
Code CDC0 points to a failed throttle body actuator. On S85 and S65 engines, a failed throttle actuator motor stores CDC0, 2B57, and 2B21 in the fault memory. These codes are linked and point to a problem in the throttle control system.
The throttle system uses an electric motor (servo motor) that opens and closes the throttle plate on command from the control unit (DME) to regulate airflow. When the servo motor or its circuit fails, the control unit logs the fault and puts the engine into limp mode.
Symptoms
Symptoms
- The engine drops into limp mode.
- Loss of power.
- The DSC and EML warning lights come on in the instrument cluster.
These symptoms show up when the throttle actuators fail.
Causes and fixes
Diagnosis and Repair
Replacing the Throttle Body Actuator
- Replace the throttle actuator(s).
- Use the OEM part: OEM S65 Throttle Body Actuator.
- Repair kits aren't recommended given the age of the engine.
Repair Options
- Budget, mid-range, or premium option — replace one or more actuators based on diagnosis.
Possible secondary damage
Secondary Issues
This failure isn't critical and won't damage the engine, but it does take the fun out of driving.