Vehicle Shudder problems of the 2015 Chevrolet Silverado 1500

Tl-the contact owns a 2015 Chevrolet silverado. While driving 45-60 mph the vehicle was vibrating, shaking and struggling to accelerate , there were no warning lights illuminated. The vehicle was taken to flow gm auto center of winston-salem 1400 s stratford rd, winston-salem, nc 27103(336) 937-9049 who were unable to duplicate the failure the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was 38,000. Ap.

Tl the contact owns a 2016 Chevrolet Silverado 1500. The contact stated while driving 45 mph, the vehicle start to shake abnormally when the accelerator pedal was depressed. The contact stated that the check engine warning light was illuminated. The vehicle was not taken to a local dealer or independent mechanic to be diagnosed. The contact repaired the vehicle himself by replacing the spark plugs and ignition coils however, the failure recurred. The manufacturer had been informed of the failure. The manufacturer stated that the vehicle was not under warranty. No further assistance was provided. The failure mileage was approximately 60,000.

Purchased new 2015 Chevrolet Silverado 1500 in January of 2016. Experienced a vibration at all speeds from the very beginning of purchase. Vibration gets worse at higher speeds. Vehicle came with steel wheels from the factory. Vibration can be felt in the seat and seen in the center console. Vibration is coming from rear of vehicle. Replaced wheels and tires with aftermarkets. The aftermarkets were bigger and heavier and made vibration extremely worse. After assuring that I wasn't dealing with a problem with the new wheels and tires, I put the factories back on and took the vehicle to dealership and reported the problem. The vehicle was in the shop for 3 1/2 months. The vehicle failed pico scope tests. They put several new tires on the vehicle, changed both rear axles, and changed ring and pinion in rear end. These steps helped reduce the vibration, but did not totally resolve the issue. They then decided to put aluminum wheels on the truck, which helped reduce the vibration down to barely noticeable. My concern is by putting the lighter wheel on the vehicle to reduce the vibration, they are only masking the problem, since the heavier the wheel/tire assembly, the worse the vibration. They are telling me they do not have to do anything else to the vehicle. General motors has told me they are not going to pursue the issue any further. They tell me they know there is an issue but not sure what it is and since it is not a safety issue they have honored the warranty. How do they know that it's not a safety issue if they don't know what the problem is. I believe they know exactly what the problem is and they are passing it on to the consumer. There was no disclosure of the issues with these trucks upon purchase. I do not feel safe in this truck and fear future problems with the issue. Also, the truck on several occasions has down shifted abnormally causing rpms to rise.