2018 Chevrolet Impala Power Train

The contact owns a 2018 Chevrolet Malibu. The contact stated that while driving at various speeds, the vehicle hesitated or jerked while depressing the accelerator pedal, with an abnormal humming sound coming from the vehicle. The contact stated that the check engine warning light was illuminated. Additionally, the contact stated that while in reverse(R), the vehicle failed to accelerate while depressing the accelerator pedal. The vehicle was taken to an independent mechanic where the vehicle was diagnosed with transmission failure. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The vehicle remained with the independent mechanic unrepaired. The failure mileage was approximately 128,000.

Since vehicle purchase in 2018 there is a shifting problem with the transmission. I have paid for shifter repairs and still the problem exist. While driving the car gets stuck in gear and hard to accelerate. The issue happens at various times without warning. There has been two instances that could have led to potential accidents. Upon spraking with and researching other impala owners, this is a common problem in the 3.6 engine Chevrolet Impalas but nothing has been done. The dealer has a plan to determine but it has always cost $1500+ to the customer.

While driving or idling (car in D/M, both automatic and manual), the car will rapidly shift to park and then back to where the shifter was set, usually in a lower gear that slows the car down or prevents acceleration. The transmission or speed sensor could be an issue. This can happen in rapid succession 3-5+ times in a row, which has led to a drop in speed from 65 MPH to 40 MPH, especially dangerous at faster speeds on a highway or when deceleration is occurring more quickly, like going up a steep hill. I am unsure what indication there is for cars that are behind me, but they have had to slow down or pass me in some instances to avoid hitting me. If it happens while turning at a 2 way stop or on an entrance ramp, my car might not accelerate fast enough to merge into traffic. There have been no lights on the dash, and the dealer has not been able to identify the issue when I have taken it in.

I have a 2018 Chevrolet Premier Impala that has started skipping gears at 1st and 2nd while driving. The vehicle shudders when it changes gears. Took vehicle to dealer who informed me that the transmission needs to be replaced already. I haven't received any dash messages or vehicle warnings prior to noticing the transmission problem. I always kept the car properly serviced by the dealer for all routine maintenance requirements. I am the original owner of this vehicle. The car has under 100,000 miles. Dealer informs me that it will take at least a week before they can possibly get new transmission for vehicle. I may be without vehicle for at least 2 weeks minimum.

TRANSMISSION SLIPPING, ROUGH SHIFT AND BUCKING BACK AND FORTH. HAPPENS INTERMITTENTLY AT LOW SPEEDS AND IN STOP AND GO TRAFFIC AS WELL AS HIGHWAY SPEEDS AND WHEN PASSING.