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GMC TSB #GCUS-3-886
2017 GMC Sierra
TSB Document:
Affected Component: POWER TRAIN:AUTOMATIC TRANSMISSION
- Summary
- 17098 - Service Update. Certain vehicles may have a condition where a false failure action is being taken when it is not required. This condition can result in the transmission holding the last known safe gear for 6 seconds. A malfunction indicator lamp (MIL) is set when this default happens more than 2 times, and reduced propulsion can happen for all 8-speed transmission applications. Dealers will reprogram the transmission control module (TCM).
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