Audi: Transmission Does Not Shift Due To Cabin Air Filter
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Audi Quattro vibrates at idle


Audi: Transmission Does Not Shift Due To Cabin Air Filter


Model: 2001 Audi A6 Avant Quattro, 2.8L

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The customer states the transmission does not shift.


Confirmed the customer’s complaint and found the transmission did not shift. Inspected the automatic transmission fluid level and condition and found both were within specifications. Connected a scan tool to communicate with the automatic transmission control module (TCM) and found the automatic TCM did not communicate with the scan tool. Performed a visual inspection of the automatic TCM and found water had leaked into it.

Disconnected the automatic TCM connector and found the automatic TCM terminals were excessively corroded. Upon further inspection, found the cabin air filter cover was not placed in the proper position and allowed water to leak through the filter, into the vehicle and under the body.



Replaced the automatic TCM and cabin air ­filter and verified the vehicle operated properly. The customer’s concern did not return.

Courtesy of Mitchell 1’s SureTrack Real Fixes.

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