-Engine gas consumption state 21 MPG Highway, 17 MPG Combined and 15 MPG City. When I started using this vehicle during the first weeks and months the best MPG I could get at the highway is 18.5 MPG with top tier gas such Shell & Chevron during the first 2 years and now Costco brand. Every since I bought it, the gas MPG have gone down around 0.5 MPG. The vehicle feels that it has to use more gas in order to perform. -The motor oil pump at times moves down from the 40 mark to the 20 when idle at traffic light and when it starts moving, it temporarily moves to the 60 mark. -The transmission is an 8 speed automatic. It has issues shifting to first gear, second gear and times 3rd gear. When driving at slow speeds like in traffic jams, mall parking lots or when you slow down at the traffic light and then turns green and you start accelerating again it feels harsh on gearing down and up, like someone rear ended your vehicle. -This truck has the Active Fuel Management (AFM) and it turns on even slower speeds and you feel how the engine and transmission struggle to really gear up and down. Like it never gears and tries to accelerate at a higher gear. Like in manual transmissions when you accelerate on a higher gear than at correct own it takes forever to reach the needed speed. -Even if all 8 pistons are on it feels as if I am running on a smaller engine like a V6 or V4. -The driver car seat feels that move a little like an 1/8 of an inch. -It just feels that something is wrong with motor and transmission.

- El Paso, TX, USA

Steering wheel jolts aggressively from the drivers hands. All electronics shutdown, engine shuts down, stabilitrak error & trailer brake on display. These conditions occur at any speed, going straight or turning. 25mph in city, driving 45 mph country roads or when stationary. Very dangerous!

- Medina, OH, USA

While driving the vehicle home from work, the vehicle shut down in the middle of traffic on a street while stopped at a traffic light and would not move after attempting to put the truck in "drive". I had to call for an emergency roadside service (tow truck) which towed the vehicle to a GMC dealership service dept. I was told by the service technician that the transmission torque converter has disintegrated and it would cost over $5000 to repair. This vehicle did not provide any warnings (no warning signal displayed on the instrument panel) that the transmission needed servicing. I have owned this vehicle for 3 years. This vehicle needs reviewing for a recall.

- Southaven, MS, USA

The contact owns a 2016 GMC Sierra 1500. The contact stated that while her husband was driving at 45 mph he suddenly saw smoke coming from underneath the hood.the husband pulled the vehicle over and got out of the vehicle quickly and watched as the vehicle was engulfed in flames. The entire vehicle was destroyed by the fire. There were no injuries and a police report was not filed. The wreckage was towed to an impound yard. The contact retrieved a wreckage and towed it to a private residence. The dealer and manufacturer had not been contacted yet. The failure mileage was 50,000.

- Alburquerque, NM, USA

Brakes fail. Will not allow vehicle to come to a complete stop when going forward or in reverse. When accelerating vehicle violently shakes. This happens at any speed above 20mph.

- Goose Creek, SC, USA

The contact owns a 2016 GMC Sierra 1500. The contact stated that while reversing, the steering wheel seized with the check engine warning light and parking assist warning light illuminated. The contact stated that the vehicle needed to be shifted to park and restarted for the vehicle to operate as intended. The failure recurred multiple times. The dealer was not contacted. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 42,000.

- Savannah, GA, USA

There is a small pin hole in the radiator that the dealership advised was created because of a problem with the thermostat. Apparently GM is aware of the problem and will fix it if it's prior to 60,000 miles. I am several thousand over now and they refuse to cover any of the $1100 bill to repair

- Bridgton, ME, USA

While making turns the vehicle intermittently stalls, losing all control of steering and electrical components. When it stalls there is no steering control whatsoever and the vehicle does have brakes, but slow to react.. restart the vehicle and the computer system slowly resets. This has happened 5 times in the last2 days. Taking the vehicle to the dealership as soon as they have an opening.

- Crownsville, MD, USA

The contact owns a 2016 GMC Sierra 1500. While driving approximately 15 mph, the vehicle lost power and stalled. The contact shifted into park and restarted the vehicle. The contact stated that the steering wheel began to shake violently and the vehicle came to a complete stop again. The vehicle was shifted into park and restarted. The vehicle was driven to the contact's residence. The vehicle was not taken to the dealer or an independent mechanic for diagnostic testing. The manufacturer was not notified of the failure. The vehicle was not repaired. The approximate failure mileage was 45,000.

- Owens, MD, USA

On two separate occurrences, w/ family in the vehicle, starting speed at approx. 35mph, the accelerator (gas pedal) stuck to the floor during the process of passing another vehicle during city street driving. Top speed got to approx. 55mph, w/ stop lights fast approaching. The pedal simply would not release from full throttle until after the vehicle finally came to complete stop with brakes applied, shifter to neutral position, slamming the shifter to park, and ignition was turned off! had to take immediate and decisive emergency actions during both situations! the first time it occurred, thought perhaps the rubber floor mat may have contributed to this event; however, driver side floor mat was immediately removed. Several days later, during similar operations, the accelerator (gas pedal) again stuck to the floor board in full acceleration mode w/ family in the vehicle! currently have appointment set-up at a huntsville, al. GMC dealership. This truck was purchased brand new at laura Buick in collinsville, il. Although I realize there are other GMC customers; not sure why this huntsville, al dealership would not work me in sooner. This vehicle has approx. 49K miles and should still have warranty remaining until 68K miles. GMC service department rep. Stated, "Monday 26, February is first date available."

- Harvest, AL, USA