At around 20 miles per hour, while accelerating, all torque is lost and the vehicle engine revs high. it takes a few seconds, then the transmission finally shifts into the next gear. this causes a big jolt. it is dangerous, all power is lost, then suddenly too much power is applied. this has happened since i purchased the vehicle. i have taken it to the dealership. they won't do anything about it. the vehicle now has 40,502 miles.
I had my 2017 gmc terrain denali for two years and have already experienced two serious issues. issue #1-i noticed a burning smell, grinding noise, and hesitation when driving. i brought it to the dealership where i bought it and was told that there was a factory defect which caused something inside my transfer to bore a hole through it. dealer could not get the part for 2 weeks. it was covered under my warranty. a month later while getting an oil change at a different auto shop, i was asked if i recently had work done only transmission because the entire thing was loose and moving, and the car did not drive right. i was told it was not safe to drive. i brought it back to the dealership and was told that they couldn't find anything. they tightened the bolts on the transfer case and charged me a $60 diagnostic fee (for their error). issue #2-at 63,000 miles my wipers stopped working while i was driving at about 30mph on a busy street in the pouring rain (very scary). i brought it to the dealership and was told i needed a new wiper transmission and would cost $318 because my car was not part of the recall. i expressed concern that my 2yo. car has now had two serious safety issues and was told 'cars have so many moving parts and pieces that it's a wonder more things weren't wrong with it'. i do not feel safe driving this car and the service manager was condescending and couldn't care less. gmc needs to do something before somebody gets seriously hurt or worse.