4 wheel drive did not engage before. Stuck on an snowy parking structure and could not get up the ramp, due to 4WD not engaging.drive shaft parts broke while engaging 4WD. It was cracked prior to the break, but the torque caused it to snap impacting the transmission, ripping out the filter from the transmission causing irreparable damage. Rear wheels were in mud near a boat ramp. Front tires were on dry ground. Attempted to pull out, rear tires spun. Stopped truck, put into 4 hi and the front tires would not catch, and rear spun. Digging deeper into the mud. Stopped the truck and put it in 4 lo, placed it in drive pulled out slowly and then a loud bang. Immediately turned off the truck.. had to have it towed. Sutliff Chevrolet in harrisburg, pa refuses to cover this under warranty due to "abuse". they insist 4WD is working due to the light on the dash lighting up, but the drive shaft is not attached. 4WD can not be verified until after it, S repaired. You can clearly see in the pictures how part of the crack is clean and the other half is dirty from road grime.

- Highspire, PA, USA

The truck is a 2016 Chevrolet 3500 hd diesel, when the truck goes into regeneration mode the truck accelerates without notice. It doesn't matter if it's in park, reverse, neutral or drive, the RPM of the engine speeds up to about 900 RPM. In a forward motion it will speed up from 6 mph to 10 mph in drive without notice. In reverse it will speed up to 5 mph without notice. If you are at a stop light and it goes into regeneration mode it will almost push through the brake, inadvertently catching you off guard and having to push on the brake with even more pressure. I've taken the truck to the dealer and was told twice that it's a characteristic of the computer and can not be changed.

- Norco, CA, USA

We have had repeated instances, where engine light comes on, and fuel guage flat lines. If you can not get to a qualified dealer soon enough, vehicle shuts down without warning[actually it remains running until it almost comes to a complete stop]. we have had to instances of shut down, and at least 6 instances altogether of engine light/ fuel guage flat line. This has all happened since vehicle was put in service in January / 2016. We use this vehicle to travel across the lower 48, and parts of Canada, to pick up breeding bulls, that have values ranging as high as 1 million or more. These animals have all been tested for Transport back to our facilities in plain city, oh, and once on the trailer, are not to be removed, unless it is an absolute emergency, because of regulations. Our concern is that, what happens if this vehicle is going up a mountain hwy or any other situation where there is another vehicle following to closely and they hit us and end up killing the animals, me, the person that hit me, or all of us over a fuel transfer pump that GM says is not part of it's powertrain warranty or no longer in it's bumper to bumper warranty. Their line is, that the vehicle is currently repaired, and functioning properly, therefore there is no issue or any reason to keep a case file # on it. We have learned thru other instances, that there is a dealer service bulliten for the same problem we have been experiencing, and supposedly they are trying to find a solution, which has yet to come to light. All instances on this matter have happened in various states across the country, while cruising at speeds between 65 & 70 mph on interstate hwy to this date, with the last instance being on 12/01/2016. We have expressed concerns to GM of safety, and an actual fix for this issue, and so far the best we get from them is, we're sorry for your inconvenience.

- Plain City, OH, USA