When merging onto I-70 freeway from on-ramp, I applied throttle to move into the traffic flow. Engine "stumbled" as if in a dead spot. Truck did not accelerate and appeared to be lugging badly. Transmission was in too high a gear and seemed to be searching for correct gear. During this time oncoming traffic was forced to brake and there was a near miss of having a rear-end collision. All I could do was watch in the rear view mirror as traffic converged on me. This "dead throttle / wrong gear" issue has happened repeatedly on surface streets but luckily on surface streets I was not in such a critical situation. This is a problem that has been reported repeatedly and at many places on the internet. When will NHTSA force GM to address this issue? hopefully you will act before this results in serious injury or fatalities (if it already has not). Please act!

- Golden, CO, USA

Engine seems to lag under quick acceleration. Problem occurs most often when accelerating from a turn or when changing lanes under acceleration. Speeds of occurrence mostly approximately 20-25 mph. Requested checks and service at a dealership only to be given a service bulletin from GM stating this was a normal part of the traction management system. My previous vehicle (2014 Silverado) was also listed on the bulletin, but the problem was never noticed on this vehicle. I see this issue as an increased risk of a collision with the highest risk being a rear end collision. This needs to be addressed and fixed.

- Albuquerque, NM, USA

The transmission does not downshift from a high gear (5 or 6) to a lower gear when slowing down from 45 mph to 20 mph (or lower). When the accelerator is depressed to accelerate the engine bucks, vibrates, and does not accelerate. The engine RPM drops to 1,000 RPM or lower. If the accelerator is quickly floored the transmission downshifts several gears lower and jerks forward. This condition happens primarily on secondary roads while driving along the road and when pulling from one road into traffic on another road. The situation when pulling into traffic is dangerous because the truck does not accelerate as it should. This truck was purchased new and has 6,500 miles on it. This condition has been present since the truck was new and the severity varies with truck speed and road inclination. The situation has been reported to the dealer and to Chevrolet customer service. No corrective actions have yet to be made.

- Ashford, CT, USA

While driving the vehicle over 40+ mph and then reducing speed due to traffic to 20 mph, and then accelerating the engine again between 21-28 mph it seems to bog down the engine almost as if the transmission shifts into to low or high of a gear and makes the vehicle feel like it's bucking/jerking when trying to accelerate between 21-28 mph and then a burst of speed. Vehicle does it all the time between these speeds. Vehicle was bought brand new had it custom ordered and only had 9 miles on it so I know it's not a issue from someone else driving it vehicle currently has 1,200 miles is a V-6 crew cab

- Port Orange, FL, USA

Driving at about 60 miles a hour and lost all power engine was running but going no were all light were lite on dash like you turn key on before starting thank god no one was coming the other way or the car behind me would have hit me. He was a good driver. Shut it off and restarted it then it would run with all light on dash even brake light and anti skid light and it said on infro. Running at reduced speed. Drove to my home a slow speed it let me. Shut it down let it sit a few min. Restarted it still the same. Shut it down for about ten mim. Restarted it. Seem to run ok but check engine light is till on now I afraid the will just reset it and say it is ok. And next time I won't be so lucky. It has 5500 miles on it. I did see my life before my eyes hopping it dose not happen to others. Taking dealer tomorrow it happen at about 5pm 3/24/2016

- Harrisburg, PA, USA

Transmission does not downshift properly from upper gears (5,6) to lower range when decelerating from 40 + mph to under 20 mph. Vehicle will exhibit loss of power from being in too high of a gear range, causing "chugging", and then a sudden burst of power as you try to accelerate. Dealer reset ECM for transmission; problem persists. Typically occurs on residential or non-freeway streets, but has happened entering a freeway entrance ramp.

- Inver Grove Heights, MN, USA