Hesitation when engine is cold shifting from reverse to drive. Some shift is so hard that it feels like being hit from behind. Took truck to dealership to correct the problem. They performed the tsb 18-na-355. This did not correct the problem. Dealership advised there was nothing else they could do about this issue.

- Texarkana, AR, USA

The first thing that happened was that all of the electrical systems on my truck went out and my truck would not start. It finally started but it would not move finally it would move but very slowly this happened on 11/20/2019 I have documentation through onstar for this incident. My brakes started slipping on 07/01/2020 and still do not work properly. My transmission has never shifted correctly. When I accelerate or when I slow down there is a shudder and a jerking sound. After sitting for a while when my truck is put in reverse it hesitates and then seems to jump into gear.

- Owens Cross Roads, AL, USA

The transmission failed at 32,000 miles slipped so bad could hardly drive it home on highway I95 jacksonville Florida. Finally got a dealer appointment after over 2 weeks of waiting without the use the vehicle. They replaced the fluid and said it was now good. Still tends to slip I asked why they were not replacing the whole unit said no need as my warranty is almost up?

- Fernandina Beach, FL, USA

Hard shifting that started around 40000 miles and has progressively gotten worse. The same thing happened to my 2017 Chevrolet Silverado 1500 and at 90000 miles that vehicle's #3 sensor in the transmission failed. It appears this vehicle is on the same path. The transmissions in these vehicles are trash. It happens in lower gears.

- Tomball, TX, USA

I have been noticing a shudder and hard shifting intermittently when driving about 30-60mph and I took it into the shop they said they can not duplicat the issues so I take it back and it started doing it more. I took the truck back to the shop again and yet again they told me they can not duplicate the issue. No here I am at 17K miles on is still doing it and shiftting hard and now there is a knocking noise. I talked to the dealer ship and they said its under warrany still just drive it tell it get worse.

- Anchorage, AK, USA

While under power and driving, the truck experiences noticeable vibrations that seem to come from the drivetrain.

- Burleson, TX, USA

Purchased vehicle brand new from dealership and from day one, I notice the power train slow to shifting from gear one to two. The vehicle hesitates and sometimes shifts hard only during cold starts. Every time I take it in for my schedule service I report the same issue to my service advisor along with the service manager at the GMC dealership. They say that it is a normal problem and they know about it. The last schedule service I told them about the same problem, this time his service tech test drove vehicle and said torque converter was shuddering causing vibration. The solution he said they changed the transmission fluid. Today I still notice the same issue and will report to the dealership next time I take in for service. I have read this is a common problem from the manufacture since putting in an 8 speed transmission. I feel this is a safety issue and some day I may feel that the transmission may lock up on me and may cause an accident.

- Orange Park, FL, USA

When truck is in motion shifting from reverse to first/second gear it jumps forward into gear. There is a hesitation shifting into gear. It is a very well known problem with the 8 speed transmission. I have been in contact with the dealer but 3 different times. The know the problem as does GMC. They actually can fix the problem. But will not do anything until GMC sends out a technical bulletin. There has been an unbelievable amount of complaints. I understand GMC is hesitant because they may have to replace transmission and or torque converter which would naturally cost a lot of money. But also I understand changing to a different transmission fluid will help. But dealer will not do it. This has been going on since the day I bought it brand new and I only have 5700 miles on it. I have not had accident because of this. But concerns me with the hesitation and jumping in to gear. Also it does not do it every single time. Depends on your take off speed.

- Horseheads, NY, USA

I bought this vehicle new from day one I noticed the truck was jerking between 2nd gear and third. Only when cold I figured it was normal. I have 11,000 miles now and the jerking is worse and does it when I hold a speed between 45mph and 50mph also. When I am coming to a stop it hit hard into 1st gear and when I take off it hits hard into 2nd gear.

- Harbor, OR, USA

A/C stops working 2.) mechanic does vacuum test and replaces refrigerant ($200) freon 3.) A/C is blowing hot air again after 3 days; refrigerant completely gone 4.) mechanic runs dye through lines to find the leak, replaces refrigerant again and states the problem is compressor failure ($200) again 5.) the overall fix would be to replace the compressor ($1,000) but there are no compressors to be found, the part is on national backorder because of the widespread problem." Left side of wheel making aloud noise when backup, it is a know problem with the steering rack tansmission downshift from 30-15 make a push effect and couching noise

- San Francisco, CA, USA

The front end of my truck has an very noticeable intermittent rumble and shake when I'm holding steady around 1200 RPM and 45 mph. My RPM gauge will surge about 50-100 rpms when it rumbles. If I speed up or slow down it goes away. My wheels and tires are balance so that not the issue and my drive is smooth otherwise.

- Houston, TX, USA

I have a 2018 GMC Sierra denali, when the vehicle is cold, usually first thing in the morning, the truck starts out in first gear and then feels like it lacks power or transmission is slipping and then bangs into 2nd gear.the more I drove the truck the worse it got. While driving down the road there is a vibration within the truck. The faster you go the more of a vibration you feel. During the vibration the steering wheel is not shaking and when you let go of the wheel the truck stays straight, so it's not the front end. Took the truck to the dealership where it was purchased, pellegrino GMC, which is a 30 minute drive and they couldn't duplicate the problems. The service advisor was advised prior to my appointment, that the banging into gear only happens when its is cold. He advised me that what I was feeling was a normal shift for my truck. I advised him about the service bulletins and he stated that it didn't pertain to my truck.the mechanic test drove my vehicle for 13 miles and didn't feel the vibration. He checked the engine codes and found none. I have had the truck a little over a year and it has 6000 miles on the odometer.

- Absecon, NJ, USA

Jumps into gear hard from 1st to 2nd gear under 25 mph very dangerous when on icy roads and also down shifting coming down from a hill RPM's stay high even though you aren't going very fast less then 17000 miles on it had it too the dealer nothing they can do just document

- Arcadia, WI, USA

Transmission shifts very hard from first gear to second gear when in motion. It also has a violent shudder when it is trying to select a different gear, most apparent around 35mph. If brake isn't pressed hard enough, shifting out of park could cause vehicle to run into something due to the hard shift when stationary.

- Franklin, TN, USA

I own a GMC Sierra which is 14 months old, purchased in dubai uae from alghandi auto. The last service for 40000 kms was done on August 8th, 2019 and no problem was highlighted except the battery that was subsequently changed. On Friday early morning (Sep 27, 2019), we have escaped a major accident on sheikh zayed road on account of the front wheel axle that just broke/came apart while driving, causing the front right wheel to detach from the vehicle, subsequently skidding to the right causing major damage to the suspension and many other parts in the vehicle. This could have caused even death of my son who was driving the vehicle. I would appreciate an immediate call from your office to resolve this as I am no longer interested in driving this car that can cost me & my family our lives. This needs to be done immediately as I would otherwise be in the process of seeking legal advice against GMC.

- Dubai, 00, USA

The truck shifts very hard - from what I've read online, GM knows of the issue but will not "fix" the issue -- only 26K miles on the truck

- Smithfield, VA, USA

The contact owns a 2018 GMC Sierra 1500. While driving, the vehicle failed to shift into gears, switching from V8 to V4. There were no warning indicators illuminated. The vehicle was taken to classic Buick GMC arlington (1400 E interstate 20, arlington, tx 76018, (817) 264-7782), but was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 48,000.

- Dallas, TX, USA

The contact owns a 2018 GMC Sierra 1500. When the contact shifted into drive, the vehicle lunged forward with the brake pedal depressed. As a result, the vehicle crashed into a handicap sign. There were no injuries. Prior to the crash, the vehicle was taken to bill kay Chevrolet (located at 601 ogden ave, lisle, il 60532, (630) 968-2900) to be diagnosed due to hard shifting. The contact was informed that a transmission re-learn of the software was needed to correct the hard shifting; however, the failure became more pronounced. The contact stated that the failure was intermittent. The vehicle was not repaired. The manufacturer was informed of the failure and declined to assist. The approximate failure mileage was 13,000.

- Chicago, IL, USA

I experienced failure of the transmission to sift up or down on several occasions between 11/01/2019 and 11/11/2019. On 11/08/2019 I was monitoring the transmission temperature, and when the transmission temp reached 164 deg, the transmission would stop shifting properly at 25 to 30 mph, and the trans temp would jump to 192+ deg. Transmission seemed to slip and the vehicle would not accelerate. Rpms jumped to 3K-4K rms but speed would not change up or down. Contacted the dealership and made an appointment for 11/11. On 11/11 I drove the to the dealer 10 miles away. I monitored the trans temp as I drove, and no shifting issues until just before reaching the dealership (trans temp had reached 154 deg). I road with the dealer rep for a test drive and he was able to duplicate the problem at 30-mph and trans temp quickly rose again to over 192-deg. Dealer rep tried to use the manual shift option but even using that he was unable to get the transmisson to shift properly ans engine rpms exceeded 5K and stayed there until the transmission shifted into gear. Dealer rep stated that is not good during the test drive. Arriving back at the service department the dealer rep that test drove the vehicle told the service dep amanger the vehicle was not safe to drive. I was told the transmission would need to be torn down to figure out what the problem was and it might be after the first of the year before they would have it fixed due alack of parts due to the recent strike, and a bag log of vehicles already waiting repair parts. Other complaints that seem to match mine are NHTSA ids: 11193281, 11230193, 11221668, and 11205523. Issue is a serious safety issue if the vehicle cannot accelerate safely to merge with traffic.

- Tyrone, GA, USA

When the truck is driven first thing in the morning the transmission shifts from first gear into second gear the transmission shifts very hard or hesitates causing the driver to surge forward almost as if the vehicle were hit from behind.

- Anderson, SC, USA