2023 GMC Sierra 1500 Problems

Code P1098 came up today 80k on the truck. Coolant Control Valve failure. Second time this has failed, first at 45k. Speed reduction activated.

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving 70 MPH, the engine seized, causing the vehicle to stall and lose motive power in the middle of the interstate. The vehicle was unable to restart and was towed by OnStar service. The vehicle was towed to the dealer, where it was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was scheduled to be repaired by the dealer. The manufacturer was made aware of the failure by the dealer.

Truck rear wheels locked up while going between 45 - 50 mph nearly causing accident. Driver behind me had to lock-up their breaks to avoid collision. This is happening every time I drive the truck for more than 30 minutes. It is happening multiple times a day now. I cannot drive truck - too unsafe to drive. Tried getting serviced, but local GMC dealer said they are backed up with truck transmission issues and can't get mine in until Sep 15 - 3 weeks after first reporting. No warning signs. The locking of rear wheels takes me by surprise.

Purchased above listed vehicle new in XXX. Immediately noticed a 'coolant' smell in cab. brought vehicle in for coolant smell issue on XXX and XXX. We were told that there was no issue until finally on XXX we were told the radiator needed to be replaced at OUR expense. XXX we received a letter from GMC advising the "engine coolant control valve" may fail. In XXX while driving on mountain roads (we live in [XXX]) the check engine light came on and while at 50 mph, the vehicle went into "limp mode" we lost power and speed was immediately reduced. We now know that a symptom of that valve failure is coolant smell in the cab of the car, a problem we had attempted to address with GMC from the beginning. We could have had a serious accident driving on a busy mountain road when this failure occurred. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

A trim piece under my hood and above my grille on my 2023 GMC Sierra SLT 1500 flew off and over my windshield this morning during a heavy wind and rain storm. There was no previous damage to the front of my vehicle.

Upper bezel of front grille blew off driving down the hwy landing in oncoming lane of traffic. This is a known problem to GMC on late produced 2022 model year and issued a safety recall #XXX to replace the bezel and reinforce mounting points. I bought my 2023 GMC XXX and it was made in [XXX] so good chance it was made in 2022 and I could of had one of the faulty grilles. If not GMC still has a problem with upper grilles detaching while driving. I have talked to my dealer and GMC customer satisfaction with no help offered. I have bought a new grille and installed it. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving 35 MPH, the vehicle lost power steering functionality. The "Service Power Steering" message was displayed and ESP warning light was illuminated. The dealer was contacted and diagnosed the vehicle with a short circuit in the module used to control the rack-and-pinion system, which had blown the fuse. The manufacturer was contacted by phone and made aware of the failure. The failure mileage was approximately 83,000.

The front grille trim moulding failed and flew off on the highway. Also, the forward collision light on vehicle from the front camera not working and needing to be replaced.

Addendum to previous submission # 11760415. At 15,033 mileage again multiple codes present along with a rough running engine. Dealership service dept confirmed on 9/17/2026 verification of 10 active codes , 2 pending codes triggering check engine light. Onstar notification as well of engine issue. Prominently codes P0016 & P0340 lead the list. PICO testing was stated to have failed two out of 3 parameters. Officially stated now as an engine defect which is being directed to be replaced with a remanufactured , not new , motor. Very fortunate to not have experienced dramatic failure ( loss of propulsion ) at highway speeds far from home. Even though this vehicle warning's persisted prior to this ultimate conclusion it was insisted that ultimate failure was necessary before any resolution would be instituted. A safety conundrum if you will. A high probability safety risk of continued use ( based on historical data on this known engine failure risk ) to ‘ prove ‘ it would fail like many others already have. A fair assessment of my personal experience.

The truck shut off and would just crank. It threw the code P129F. And wouldn’t start up until after 15 minutes.

The truck shut off and would just crank. It threw the code P129F. And wouldn’t start up until after 15 minutes.

The front grille trim moulding failed and flew off on the highway. Also, the forward collision light on vehicle from the front camera not working and needing to be replaced.

My 2023 GMC Sierra 1500 SLT 4WD currently at 67659 miles was taken in to the dealer because of excessive jerk when accelerating or trying to reverse, diagnostic scan failed for check engine and ABS trouble codes. The scan return code PO747 indicating transmission pressure control solenoid “A” was stuck on for a predetermined period of time. The recommended repair is replacement of automatic transmission, solenoid control valve body. I’m aware that GM has issued a TSB 25–NA-255 and special coverage N24245441–02 addressing this exact failure on the GM 10 speed and that GM previously issued a related recall N242454440 addressing this exact failure on the GM 10 speed transmissions, and that GM previously issued a related recall for this citing rear wheel lock up risk associated with transmission valve condition. My vehicle scan showed an ABS failure at the same time as a transmission. code, consistent with the safety risk. GM has already acknowledged and its own recall documentation however I was told to contact NHTSA to document the safety risk and request investigation of the scope of this defect across affected models years and vehicles as mine seems to have fallen short. I previously owned a 2021GMC vehicle same model that experience the identical transmission valve body failure that vehicle could not be repaired in a reasonable time and I ultimately experience financial loss and had to replace a vehicle now I’m experiencing the same defect on the vehicle purchased (this one) with significantly fewer miles than would be expected for a major transmission failure, indicating that this may be a reoccurring manufacturing design defect rather than an isolated incident. Thank you for your time and I hope this issue can be resolved as I do love the truck otherwise however safety first. Thank you

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed; however, the brakes failed to respond as needed. The vehicle was towed to the dealer to be diagnosed. The vehicle was diagnosed with an inoperable battery, which caused the brake module to fail, preventing the brakes from operating as intended. The vehicle was repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 29,000.

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving 35 MPH, the vehicle lost power steering functionality. The "Service Power Steering" message was displayed and ESP warning light was illuminated. The dealer was contacted and diagnosed the vehicle with a short circuit in the module used to control the rack-and-pinion system, which had blown the fuse. The manufacturer was contacted by phone and made aware of the failure. The failure mileage was approximately 83,000.

This vehicle has water intrusion for the power steering harness. The system went out one day. Vehicle has 40K miles on it. i bought it less than a year ago as a used vehicle with 30K miles on it. Less than a year later i end up with a $6,500 bill for it.

1 - The Engine or something electrical, possibly the ECM, failed or malfunctioned, and yes, it is available for inspection. 2 - The vehicle lost power, reduced speed, was hard to steer, and I couldn't put the hazard lights on; this occurred twice while driving on the highway, once I was driving at approx 75 mph. The results could have been catastrophic not only to myself but to others on the road. These two events are not the only times the truck did this. 3 - No. 4 - No. I filed a claim with GM, but it has been approximately a month, and I've received no updates. 5 - No. Further: This event has occurred 6 times. I've taken it to the dealership three. They cannot duplicate the issue, so no repairs have been done. Apparently, approximately 100 codes come up, but they cannot diagnose the problem.

While driving in the rain, the windshield wipers were on the highest intermittent setting and the high beam headlights were also on, automatic highbeams were not. The high beam lights dimmed to low, and the windshield wipers stopped in the middle of the windshield in the middle of navigating a sharp right hand turn at 35mph. The wipers stopped for approximately 30 seconds and then resumed operation. When the wipers resumed operation, the headlights also turned back on high with no input from the driver.

The plastic upper rail glass guide frame on the rear sliding window assembly of my 2023 GMC Sierra developed structural micro-cracks during normal vehicle operation. This manufacturing defect is a known issue tracked internally by the manufacturer under Technical Service Bulletin (TSB) #18-NA-383.This structural failure allows severe water intrusion into the passenger cabin. The leaking water runs straight down the inside back wall of the cab, completely flooding and corroding sensitive, factory-installed electronic safety modules mounted directly beneath the leak path.This continuous water intrusion caused the catastrophic electrical failure and corrosion of the video processing control module located behind the rear seat. The sudden failure of this module completely disabled the rearview digital mirror camera and the 360-degree perimeter driver assistance cameras, creating immediate blind spots and an active driving safety hazard while operating the vehicle.The vehicle was inspected and repaired by an authorized dealership, confirming the rear window leak as the direct cause of the electronic destruction. The out-of-pocket cost to replace the water-damaged safety components was $2,747.00. Because the manufacturer refused to cover the replacement of the defective rear glass assembly, the structural leak remains unresolved. This active water intrusion continues to flood the cabin, creating a health hazard via mold growth and guaranteeing that the newly replaced safety cameras will inevitably short-circuit and fail again.

While driving in the rain, the windshield wipers were on the highest intermittent setting and the high beam headlights were also on, automatic highbeams were not. The high beam lights dimmed to low, and the windshield wipers stopped in the middle of the windshield in the middle of navigating a sharp right hand turn at 35mph. The wipers stopped for approximately 30 seconds and then resumed operation. When the wipers resumed operation, the headlights also turned back on high with no input from the driver.

On several occasions this Saris Superclamp bike rack has dropped from an upright position to a tilted position when there is a bump/dip in the road. A driver following has later reported to me that the rack/bikes falling quickly startled him and led to him braking. The bikes have not fallen from the rack when it drops down but I am concerned about the possibility. I have contacted the manufacturer and they will send me parts to repair if I can provide the original sales slip which I can not find. The part is available for purchase for $200 which is nearly half the cost of the rack. I have communicated to the manufacturer that this defect is a safety hazard and they should rectify the issue at no cost. They have refused.

My 2023 GMC Sierra 1500 SLT 4WD currently at 67659 miles was taken in to the dealer because of excessive jerk when accelerating or trying to reverse, diagnostic scan failed for check engine and ABS trouble codes. The scan return code PO747 indicating transmission pressure control solenoid “A” was stuck on for a predetermined period of time. The recommended repair is replacement of automatic transmission, solenoid control valve body. I’m aware that GM has issued a TSB 25–NA-255 and special coverage N24245441–02 addressing this exact failure on the GM 10 speed and that GM previously issued a related recall N242454440 addressing this exact failure on the GM 10 speed transmissions, and that GM previously issued a related recall for this citing rear wheel lock up risk associated with transmission valve condition. My vehicle scan showed an ABS failure at the same time as a transmission. code, consistent with the safety risk. GM has already acknowledged and its own recall documentation however I was told to contact NHTSA to document the safety risk and request investigation of the scope of this defect across affected models years and vehicles as mine seems to have fallen short. I previously owned a 2021GMC vehicle same model that experience the identical transmission valve body failure that vehicle could not be repaired in a reasonable time and I ultimately experience financial loss and had to replace a vehicle now I’m experiencing the same defect on the vehicle purchased (this one) with significantly fewer miles than would be expected for a major transmission failure, indicating that this may be a reoccurring manufacturing design defect rather than an isolated incident. Thank you for your time and I hope this issue can be resolved as I do love the truck otherwise however safety first. Thank you

The contact owns a 2023 GMC Sierra 1500. The contact stated that while her husband was driving at various speeds, the rear liftgate door erroneously opened. The vehicle was taken to the local dealer who diagnosed that the exterior touchpad switch assembly was faulty and needed to be replaced. The touchpad switch assembly was replaced, and the vehicle was repaired. The manufacturer was notified of the failure and informed the contact that the VIN was not included in NHTSA Campaign Number: 24V060000 (LATCHES/LOCKS/LINKAGES). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 35,000.

The contact owns a 2023 GMC Sierra 1500 equipped with a Roll-N-Lock tonneau cover. The contact stated that the tonneau cover failed to lock and latch securely since the vehicle was purchased brand new. The vehicle was taken to the dealer, where unknown repairs were performed; however, the failure persisted. Additionally, the contact stated that the latching part of the tonneau cover was missing an inch-long piece. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was unknown.

Leaking Diesel fuel, Leaking oil from the rear of the transfer case, making a claunking noise at the rear suspension, My safety is at risk for a possible fire and a crash from the Leaking oil. The vehicle was diagnosed with this problems on [XXX] at Caguas Chevrolet & GMC, also called United Collection Auto. parts were ordered on that date but not arrived. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

There is a clunking and popping noise on the rear suspension or spring leaf when going between 5-20 mph, there is no active recalls for this but there is a lot of people complaining about this problem and the dealer does not wants to take responsibility for this issue need help. They are forums online all over the country complaining about this issue.

Subject: Safety Complaint Regarding Steering Airbag Trim and Steering Axle Issues Dear National Highway Traffic Safety Administration (NHTSA), I am writing to formally file a complaint regarding serious safety issues with my GMC vehicle. Specifically: 1.The steering airbag trim has begun to crack, which raises concerns about its structural integrity and potential interference with airbag deployment in the event of a collision. 2.The steering axle is making unusual noises due to loose bolts and worn bushings, posing a potential risk to steering control and overall vehicle safety. I recently took the vehicle to an authorized GMC dealership for inspection and repair. However, the dealership refused to address these issues despite their clear impact on safety and their apparent connection to manufacturing defects. Given the critical nature of these problems, I urge the National Highway Traffic Safety Administration (NHTSA) to investigate this matter thoroughly. These defects not only compromise the safety of the vehicle but also endanger the lives of the driver, passengers, and others on the road. Thank you for your attention to this matter. I am happy to provide any additional information or documentation required for your investigation.

Warning light stated “Vehicle Restraint System requires Service”. Dealership looking into warning light.

The infotainment system loses all audio through the speakers intermittently. when this happens I also lose the Safety warning chimes as well. shutting off the vehicle for an extended period of time resets something and it resumes normal function. I have contacted GM customer service and spoke to 3 different representatives and requested an escalation to a Senior Advisor, which i was told could take up to 4 days to hear back. the vehicle has 800 miles and is 1 month old, this has occurred 4 times. it has not been looked at by the manufacturer as i am waiting for return communication. Other than no sound, everything else on the touch screen seemed to be working normal, but im no technician to determine that. i feel this is a safety concern as i travel with my 13 month old daily.

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving on several occasions at speeds above 30 MPH, the vehicle shuddered abnormally. There was no warning light illuminated during the failures. The vehicle was taken to a dealer, where it was diagnosed, and determined that the valve body needed to be replaced. The vehicle was repaired, but the failure recurred approximately six months later. The manufacturer was notified of the failure. The failure mileage was 81,000.