The contact owns a 2018 GMC Sierra 1500. The contact stated that while driving at various speeds, the temperature gauge indicated that the vehicle was overheated. No warning light was illuminated. The vehicle was taken to beck & masten Buick GMC North (11300 fm 1960 West, houston, tx 77065, (877) 380-8433) where it was diagnosed and determined that the radiator was leaking coolant and that the radiator needed to be replaced. Coolant was refilled in the vehicle. The dealer contacted the manufacturer for assistance with repairs. The failure mileage was approximately 47,000.

- Spring, TX, USA

After long periods of running and idle, vehicle stalls out has a hard time restarting. Gas paddle being press helps sometimes. Check code P2635 plus others (random secondary codes), come on. This has taken place in AZ where the ambient air temperature typically is over 100. Vehicle has been to GM dealer who says its vaporizing the fuel in the lines. Tsb pip5507B dose not include 2018, however the design hasn't changed. Conditions; long idle, hot weather, low speeds under 25 mph or idle. Location; AZ sonrona dessert, off-road, jobsite, city streets.

- Phx, AZ, USA

Bucking and surging when switching gears. Hard bang when trying to switch. Surged forward at a complete stop.

- Dracut, MA, USA

No transmission power regardless of the gear shifter position. I turned the engine on and off several times trying to get a solution, no luck. I returned to the vehicle 5 minutes later and did get it to move, ,,would only go 25 mph at 3000 rpms. I was in the middle of wi not near any major dealership on-star was useless saying I had a major engine problem and the computer was trying to protect the engine. I was directed me to a Chrysler dealer ship, who told they could not get me in for 2 weeks, suggested another branch which was over 45 miles away. I drove 5 miles to a friends house and was able to find a dealership in janesville, wi (fagan). When I started the vehicle to drive to janesville, the transmission did work. Fagan spent 2 hours working on it, and could not find a cause for the problems, they checked every computer, could not duplicate what happened. They reprogrammed all the computers. Then in cincinnati, oh the power steering assist went "off", while staionary. I tried restarting several times to no avail, drove the 3 miles left to the G'kids house, no power steering, trailer problem lighjt on, no RPM or mph needles moving. Called local dealership (borcharding) and they suggested I drive it to their location 12 miles away. When I started it, the power steering was back on, but the unit would not get out of 2nd gear, ran 40 mph at 2500 RPM, warning lights all on, engine light still on. Next moring I started the vehicle, everything was okay including the transmission problem, but still had the "check engine on", the dealership kept it (2) days, involved GMC engineers, could not determine the cause for all the problems, including loss of "steering assist". they drove it over 50 miles on two trips, could not duplicate what happened. They told me it was some kind of computer problem, but could not determine, they reset everything again.

- Delavan, WI, USA

Fuel injection seals #4 O-ring split - leaking fuel - pooling gas on manifold. Took vehicle in for smell of gas, lack of acceleration and poor gas mileage. This is known issue based on the service bulletin 18-na-137 - vehicle has less than 6000 miles

- Inver Grove Heights, MN, USA