2015 GMC Canyon Transmission and drivetrain Problems

“Hi. This is my second formal complaint regarding intermittent loss of power steering, traction control, and stability control on my 2015 Gmc Canyon. There have been recurring temporary losses of the aforementioned vehicle capabilities while the vehicle is in motion, leading to severely degraded vehicle performance, handling, and traction. In every case, warnings lights have displayed immediately before the loss of control. These lights have also 'turned-off' or reset when the vehicle was restarted. …”

“I was taking off from a stop sign and turning right into traffic. Acceleration was moderate while completing the turn where I had to reduce the throttle to prevent the tires from spinning. The transmission shifted into too high of a gear as a result and did not downshift when 50% plus throttle position was applied. Engine had lack of power. I had to stomp it to the floor to get it to downshift. By this time traffic was coming up on me fast because of the excessive delay trying to get the transmission to respond. …”

“Transmission does not down shift at speeds between 27 MPH and 40 MPH, at 30 MPH you have to put pedal to the floor then it will shift and tachometer goes around 4000 and takes off like a dragster .watch out for the guy in front of you! Now hit the brakes, real cute . Dealer tested said yes it does it but we need a TSB before we can do anything called Gmc they said file a complaint with NHTSA that I think is pretty cute also $ 38000 and your told to file a complaint . …”

“While driving at low speeds the transmission seems to float between gears as if trying to find the proper gear. Normally it takes so long that I have to push down on the gas to force the truck to shift. It does to a lower gear which makes it jump from the excess power. At high speeds, pressing on the gas pedal is non responsive as the transmission continues to look for the right gear. A manual fix for safety purposes (especially in traffic and need an answer from my transmission) is to change it to manual shifting where I control the gears. …”

“Had vehicle serviced under warranty several times for transmission issues. I was told by the dealer I had the most current software updates as of march of 2018. Vehicle continues to behave badly under certain circumstances. Transmission does not downshift properly if needing to accelerate hard. Engine RPM's rev to about 5,000 RPM and the transmission goes into too low of a gear, until the correct gear is found. This causes a delay in response that creates a safety hazard. Had only one instance where the truck accelerated hard out of a 90 degree turn even though only light pedal was used. …”