Case Study: 2013 Audi A6 3.0 TDI Avant Quattro S-Line
By Steve Smith, Automotive Applications Specialist
|The customer reported his Audi A6 would show the following messages within the instrument panel of the vehicle:
- Parking Brake Malfunction
- Start/Stop system deactivated
|Further questioning of the customer revealed the electronic parking brake (EPB) occasionally failed to release after standing overnight with the EPB applied. When the fault occurs, the vehicle can be driven without any brake binding or drag, suggesting the parking brake has released. The symptom had been very intermittent for over 12 months regardless of temperature or driving conditions. Additional feedback from the customer added, if the ignition was turned off and back on, the error messages cleared and the parking brake performed normally. However, occasionally the ignition was required to be turned off for over 20 minutes before the parking brake function was restored.
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