Table 1 shows one common power train related problems of the 2026 GMC Terrain.
| Problem Category | Number of Problems |
|---|---|
| Power Train problems |
The contact owns a 2026 GMC Terrain. The contact stated that while attempting to depress the accelerator pedal after coming from a complete stop, the vehicle started wobbling. A dealer was contacted. The vehicle was taken to the dealer to be diagnosed; however, the diagnostic result was unknown. The vehicle was not repaired. The contact associated the failure with technical service bulletin: pit6466 (shimmy, shake or wobble when leaving a stop); however, the VIN was not included in the bulletin. The manufacturer was notified of the failure and informed the contact that there was no recall for the failure, and opened a case. The failure mileage was 5,200.
The contact owns a 2026 GMC Terrain. While driving at 28 mph, the rpm became elevated to over 3,000 rpm. There was no warning light illuminated. The contact immediately pulled over and then resumed normal operation after the failure. The vehicle was taken to the dealer to be diagnosed; however, no cause for the failure was found. The contact was advised to bring the vehicle back to the dealer if the failure reoccurred. Approximately one week after the initial failure, while driving approximately 30 mph, the transmission unexpectedly downshifted to l2. There was no warning light illuminated. The contact pulled over and restarted the vehicle, and the vehicle was taken back to the dealer. A diagnostic test was performed, and the contact was informed that the transmission needed to be rebuilt. The manufacturer was notified of the failure and was provided a case number. The vehicle remained with the dealer unrepaired. The failure mileage was approximately 1,300.
The car has always had an issue where it would just get stuck in a low gear and rpms would go high. Does this every single day. But recently it also started acting like it was put into neutral for a few seconds and then back into drive.