My 2018 Sierra began experiencing severe shuddering while driving down the road. The dealer said it was caused by moisture getting into the transmission fluid and contaminating it. In my ownership of dozens of vehicle's this has never happened before. This formerly inexpensive minor fluid change requirement morphed into a $618 major surgery just to fix a problem that should have never occured. If the fluid was contaminated by moisture as the dealer explained, it's a design defect which caused it and nothing I have ever done. I am still unsure as to if the transmission or torque converter may be damaged. The manufacturer should be liable for the cost to fix this not me!

- Sunrise Beach, MO, USA

The vehicle steering wheel shudders at speeds from 40-55mph. The steering wheel shudders at 2-second intervals and is constant between those speeds. At first, I thought it might be one of the safety systems. It is not. This is unsafe and GM should be held responsible.

- Pensacola, FL, USA

The electric power steering failed while accelerating into a turn from a stop at an intersection. The wheel was jerked from my hands, and the engine stalled, all electrical failed momentarily. Within a couple of seconds everything returned to normal. This has happened several times since I purchased this vehicle. Also the electrical power steering drops out quite often at low speeds, such as in parking lots. No warnings have ever been given. In May of 2021 the dealer replaced the steering rack, the problem has continued intermittently to this date. I have researched for recalls on this problem and found that GMC issued a recall for years 2014-2017, and am amazed that they could just declare the problem fixed, and leave such a dangerous problem unresolved!

- Palmetto Bay, FL, USA

Noticed a scraping noise after new, recommended tires installed on my stock truck. Checked the door label to ensure correct tires installed, they were, returned to the tire facility and they recommended I ask a repair facility to investigate. Found that the tires are rubbing the upper control arm when fully turned left or right (both sides affected). Went online to discover that this is a common issue with the 2018 and similar GMC Sierra and Chevy Silverado trucks. This is a safety issue caused by a design deficiency. Two things can happen. One, the tire can fail. Two, the upper control arm could fail, causing the vehicle to be uncontrollable. This could be fixed by restricting the extreme left and right travel in the steering system or redesigning and replacing the upper control arm so it doesn-??t interfere with the tire. This is an unacceptable safety issue caused by a design deficiency and needs to be addressed by NTSB now.

- Alexandria, VA, USA

Hit a small bump driving 55mph on highway and had sudden complete power steering loss and extremely hard to turn. Drove to a safe location and shut down truck for 1 hour. Upon restart power steering was operating normal. Proceeded back on the freeway and as soon as I hit a small bump with driver's side front tire the same thing happened again complete power steering loss. Drove to dealership and waiting for explanation. The truck is not safe due to inability to turn the wheel without power steering. For someone with less strength, this could be deadly on anything besides a straight road, needing to turn a corner, or to avoid a collision.

- Sloughhouse, CA, USA

The contact owns a 2018 GMC Sierra 1500. The contact stated that while pulling up to park the vehicle at approximately 2 MPH, the power steering failed causing the contact to use an excessive an extra amount of effort while maneuvering the steering wheel to park the vehicle. The power steering assist warning light was illuminated. The contact took the vehicle to the dealer to be diagnosed. The contact was informed that the steering assembly and steering gear needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure and filed a case. The approximate failure mileage was 39,000.

- Littleton, CO, USA

My truck has a severe vibration or shake extremely bad at 60mph and up.i have tried new tires, front end alignment, and several different shops have told me they don't know what it is drive shaft or axels

- Austin , TX, USA

On 2/26/22, approximately 24,000 miles on the vehicle, while traveling on the Interstate a warning popped up in the display that the power steering had failed and to operate the vehicle with caution. Immediately I noticed I had no power steering, and the vehicle was extremely hard to steer. I exited the interstate and turned the vehicle off. I conducted a visual inspection; no issues were immediately apparent. After several minutes I started the vehicle, and the power steering began functioning. I conducted an Internet search and learned this is a common issue for GMC trucks, previously resulting in numerous crashes and over one million vehicles being recalled. NHTSA campaign number: 18V586, GM-€™s number for the recall 18289. 3/1/22, I contacted GM customer care and was advised my vehicle was not part of the recall. I was advised to take the vehicle to a GM service center, at my cost. 3/1/22, I contacted Mossy GMC of Picayune, MS, and spoke with a technician, who advised the issue is usually due to a drop in voltage and advised me to replace the battery. 3/19/22, replaced the battery. 3/30/22, upon startup the power steering again failed. I turned the vehicle on and off several times, and the power steering began functioning. 3/30/22, went to Mossy of Picayune, spoke with a technician, who advised he was quite familiar with the issue, stating this is a common problem with GMC trucks, he advised to replace the battery. Told him I replaced the battery on 3/19/22, he stated I would likely need to have the steering module reprogrammed, at my expense $130, or replace the steering assembly, again at my expense $1,500. 4/3/22, while turning the power steering failed, and the vehicle was extremely difficult to steer. I turned the vehicle off and waited several minutes. Upon startup the power steering began functioning. The power steering failure is a MAJOR safety hazard and a recall needs to be issued before someone loses their life.

- Diamondhead, MS, USA

The contact owns a 2018 GMC Sierra 1500. The contact stated while driving at various speeds, the vehicle lost power steering assist causing the steering wheel to become firm. The steering wheel jerked while turning and the vehicle stalled on several occasions almost causing a collision. The vehicle was taken to the dealer and the dealer informed the contact that the failure was related to Technical Service Bulletin 18-NA-161. The vehicle was not repaired. The manufacturer was made aware of the failure. The manufacturer promised to provide a callback. The failure mileage was 47,184.

- Chicago, IL, USA

Power steering just goes out while driving (pulling into parking lot) and then comes back on causing an oversteering problem.

- Lessville, LA, 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

Vehicle was being driven when suddenly the power steering quit working and vehicle was very difficult to turn without extreme effort.

- Albion, NY, USA

Truck shift into gear very roughly. Shakes when driving through all speeds. Feels as if something is falling off the truck.

- Little Rock, AR, 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

The truck was being turned on to resume driving after brief stop. The vehicle engine turned on but vehicle steering locked, front and rear exterior lights went out. After truck turned off for 20 minutes. The steering wheel unlocked, the exterior lights turned back on. I called GMC roadside services-!they recommended towing vehicle to dealership.

- Ganado, AZ, USA

I was driving 70 mph down highway 75 in mckinney tx, when my steering completely locked up. Luckily I managed to get truck stopped and towed back to dealer. This could easily have been a fatality accident.

- Anna, TX, USA

When driving the vehicle it steers very hard like a lack of power steering than all of a sudden it feels like the power steering kiks in causing a over steering situation. Feels like you have no control. Have talked to other owner who has same issue. Pickup has 40 miles on it. It happens every time I drive it.

- Larimore, ND, USA

When in traffic at any speed the steering wheel will actually turn to the left. It takes you buy surprise and it's a strange feeling. I was told by the dealer their is no issues. Very scary! it happens at anytime and without warning.

- Bangor, ME, USA

Steering pulls to left when driving at any speed, and terrain. Pulls enough to turn you into oncoming traffic if you do not correct. Took to dealership and was told nothing was wrong with the truck. Steering problem continues and is definitely a safety issue.

- Sykesville, PA, USA

When driving vehicle at any speed it steers to the left or right. Not a simple alignment pull or wander I can feel the wheel as to which way it wants to steer at random. If not paying attention or if you were to let go of the steering wheel it will go off the road absolutly not safe to drive. While accelerating the vehicle feels like the brakes are being applied and does not accelerate I have to give excessive gas petal throttle to get up to speed. There have been times I have came home from as short drive and I can smell the brakes they smell burnt hot. One instance I was merging onto the highway and the truck struggled to get up to 60mph I had the petal floored and the truck would not go over 65mph the engine was @ 5000rpm maxed out it would not shift nor go faster than 65mph. Randomly transmission thunks thud and slams into gears when the automatic transmission is shifting at low speed below 50. While driving truck feels like the drive tran is bound up like brake is applied on individual wheel(s). I have had nothing but problems with this truck very weird issues that don't make mechanical sense. Also the instrument cluster gauges and infotainment screen don't light up just black screens after starting vehicle. Happened 2 times now. Radio was off while driving then came on full volume without touching anything. Service stability /steering warning came on once.I can hear front transfer case engage and disengage at low speeds randomly when in 2wd. Randomly stuck in low gear when accelerating from a stop. And you don't have to use the brakes much to stop you because as soon as you let off gas petal the vehicle nearly comes to a stop without applying brakes. And if you are turning it will at times come to a complete stop. Has been to dealer 6 times now they say everything checks out. There is a major computer issue or is hacked per all ive researched.

- Kennewick, WA, USA