I have a 15 yukon denali and the transmission whine is noticed 10-20mph. Was told this is to be expected on the yukons as it develops over time from the dealer. GM has denied to acknowledge issue and stated that its functioning as expected.
I have the same problem with my 15 yukon denali. Took it to the dealer and they said since it wasn't over 3 seconds that it was functioning as expected. Good luck with your visit as I see it as a safety hazard as it slowly slips into gear and most folks applying the gas pedal to pull out of...
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