Brakes - Yellow Park Brake Light ON, ACC Inop. Once
46 Yellow warning light for electric parking brake on, ACC inoperative once46 12 26
2031135/1
October 23, 2012.
Affected Vehicles
Condition
The customer may state the yellow warning for electric parking brake (EPB) appeared once in the instrument cluster, but the warning turned OFF after cycling the ignition and there have been no additional occurrences.
-OR-
The customer may state the adaptive cruise control (ACC) was inoperative once, but resumed operating properly after cycling the ignition and there have been no additional occurrences.
One of the DTCs shown below is stored in the EPB module, address word 53:
Power supply of right control unit channel - implausible signal (internal code 25)
-OR-
Power supply of left control unit channel - - implausible signal (internal code 24)
Note
Technical Background
The concern is due to a software glitch in the EPB control module. Concerns related to this software glitch can only occur once. Replacing the EPB module may cause an additional occurrence.
Production Solution
A software solution is in development.
Service
The entry occurs only once. If the control unit is replaced, the complaint could occur again.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.