Three problems related to automatic transmission control module have been reported for the 2015 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Yukon based on all problems reported for the 2015 Yukon.
The contact owns a 2015 GMC Yukon xl. The contact stated that upon starting the vehicle, the transmission shifted hard from first to second gear while depressing the accelerator pedal. There was no warning light illuminated. The contact stated that while driving 80 mph, the vehicle independently decelerated while depressing the accelerator pedal, and the vehicle started shaking abnormally. The vehicle was taken to an independent and several internal parts of the transmission were replaced, and the transmission control module (tcm) was also replaced; however, the failure persisted. The vehicle was then taken to a dealer, where the contact was informed that the repairs had not addressed the cause of the failure. The contact was informed that the failure was likely related to the transfer case. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 161,000.
Transmission code p0700 and p0796 ( pressure control) I was on the interstate and my 2015 GMC Yukon slt engine locked up and shift down to 2nd gear. Causing other cars to almost hit me from behind and possibly causing an accident. I had to quickly veer off on the side of the road so that they wouldn’t hit the back of me. Immediately my engine light came on. Didn’t have this problem prior to the breakdown. Brought it to GMC dealership they told me my torque converter was bad along with computer tcm and valve body. They said I need a new transmission. My SUV have 132k miles. I called around at other transmission shops and they all said they are getting 3-4 GMC Yukons in to fix a week and knew exactly what the problem was with SUV. They couldn’t understand why GMC wasn’t correcting the problem. Also, last year had to replace the cam shaft, lifters and catalytic convertor that’s was $6000 now they tell me $5500 for transmission. That’s $12000+ in repair in lease than 1. 5 years. Never have I had this much major problem on a vehicle. This is a major safety issue especially on interstate.
My Yukon makes very hard shifts when accelerating and decelerating. The tcm was reprogrammed after vehicle shut off on the high way last November. Now the truck shudders between 25 and 45mph especially when climbing or filled with passengers. Vibration can be felt through the cabin.