2017 GMC Sierra Denali

The contact owns a 2017 GMC Sierra Denali. The contact stated that while driving on the highway at an undisclosed speed, the vehicle jerked, failed to accelerate, and stalled. The vehicle was unable to shift into third gear. The check engine warning light was illuminated. The vehicle was drivable and was taken to the dealer. The vehicle was diagnosed with a wiring harness failure on the transmission. The vehicle was repaired based on the diagnostic test but failed to fix the vehicle. The vehicle was parked at the residence and was undrivable. The failure mileage was approximately 103,000.

WHILE DRIVING MY GMC SIERRA DENALI THE TRANSMISSION SHUDDERS REALLY BAD. I HAVE A 2017 WITH JUST 13,200 MILES ON IT. I WAS PULLING MY BASS BOAT AND THE SHURDDER WAS SO BAD MY DASH WAS SHAKING AND THE STEERING WHEEL WAS ALSO .I HAVE HAD THE FLUID CHANGED AT THE DEALERSHIP AND IT SHIFTED FINE AND DID NOT SHUDDER UNTIL IT REACHED AROUND 1000 MILES AFTER FLUID CHANGE AND IT IS DOING IT WORSE NOW THAN BEFORE. I TOOK IT TO THE DEALER CLOSE TO ME AND THEY INFORMED ME TODAY THEY WERE GOING TO DO NOTHING AND THEY TOLD ME TO TAKE IT BACK TO THE DEALER I BOUGHT IT FROM! THIS IS UNACCEPTABLE! I UNDERSTAND FROM ALL I HAVE BEEN READING ABOUT THIS PROBLEM GM STILL IS BUILDING AND SELLING TRUCKS WITH THE 8 SPEED TRANS IN THEM AND STILL HAVING PROBLEMS. REALLY? I GUESS I WILL KEEP DRIVING MINE AND I HOPE THE TRANSMISSION JUST COMES APART THEN THEY WILL GIVE ME ANOTHER TRANSMISSION DOING THE SAME THING! JUST GREAT GM!