If there is an electrical or mechanical fault, CDC dampers must be checked just like conventional dampers and replaced if necessary. After installation, the CDC damper must be calibrated in the vehicle using a diagnostic tester.
The CDC system is capable of performing a self-diagnosis, but it only recognizes electrical faults, not mechanical malfunctions. In the case of a fault, the CDC indicator lamp on the dashboard lights up. To narrow down the problem, a diagnostic tester (for example the Bosch KTS) is required. It can be used to read out and delete the error memory. Depending on the vehicle, it is also possible to compare the nominal/actual values in order to check the sensors of the CDC system.