When the vehicle automatically goes into V4 mode there is a vibration inside the cabin. The vibration also sounds like a boom noise inside the cabin and the vehicle shakes while driving. The problem seems to occur at 1500-1700 rpms and will continue until you accelerate and make the vehicle go back into V6 mode. Dealer attempted to fix the problem on 2 occasions but was unable to. Dealer acknowledged the problem and categorized it as a vibration, drone, flutter or boom noise inside the cabin while vehicle is in afm V4 mode. Problem has not been fixed.

- Clifton Park, NY, USA

My 2017 GMC acadis 6 cylinder AWD has excessive vibrations that occur at 1400-1600 RPM and at various speeds.it seems like the transmission refuses to shift and it lasts for up to a quarter mile.vibration is most pronounced at speeds of 55-60 mph the dealer diagnosis says it is functioning normal. The struts were replace AT1390 miles and motor mounts adjusted, problem remains, auto brought to dealer for recall as per bulletin 17109 but it still vibrates excessively. The lead mechanic at the dealership said the auto adjusts to the driver and said the vibrations will stop at about 2500 miles. The car now has 2900 miles and it still feels like the transmission is going to fail. The vibration is uncomfortable and although the dealership said the car is safe it does not feel so.it seems impossible for a vehicle to be functioning properly with this continual erratic vibrations.

- Ship Bottom, NJ, USA

The contact owns a 2017 GMC Acadia. While driving various speeds, the transmission hesitated to shift gears and the vehicle began to vibrate excessively. There were no warning indicators illuminated. The contact referenced GMC recall number 17109 (rear differential clutch control module). The vehicle was taken to a dealer where it was diagnosed that the struts and the motor mount needed to be replaced. Additionally, field testers determined that the vehicle was operating normally. The vehicle was repaired, but the failure recurred. The manufacturer was notified of the failure, but did not assist. The manufacturer stated that the vehicle was operable. The approximate failure mileage was 209,000.

- Ship Bottom, NJ, USA

On 2017 Acadia with it's 6txx transmission, the shifts from 2-3 feel weird (especially) when driving at slow speeds. You get a feeling as if tranny takes more than usual time to engage into 3rd gear, when already disengaged from 2nd gear. This is similar to what feeling one might get if you moved from 2nd - neutral - 3rd gear. I started experiencing this issue from approx. 5K miles. This would be risky when you are trying to merge into a yield or change lanes and this shift occurs, you momentarily feel loss of control. A quick google search on this issue and you will see folks already complaining about this on forums.

- Santa Clara, CA, USA