Circuit/System Testing

NOTE:

Since most occurrences of this DTC are caused by excessive ABS, traction control or stability control usage, review with the customer the conditions under which the DTC set.

Ignition ON.
Verify that DTC C0186, C018B, C0196, C019B, C0287, or C0710 is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If none of the DTCs are set
Ignition OFF, allow the Q5 Brake Pressure Modulator to cool down to ambient temperature, ignition ON.
Verify that DTC C0280 54 does not set while driving the vehicle under normal braking conditions.
- If the DTC is set
  Replace the K17 Electronic Brake Control Module.
- If the DTC is not set
All OK.