This Problem Across All Years
Start transmission was replaced by dealer at 75 miles. 2nd transmission was replaced at 175 miles transmission was humming and slipped at around 30 to35 mph this was around April of 2024 August 1 2025 while driving at 45 dash board lit up went flashing and suv slowed dramatically down to 30 mph Got to dealership and they kept the vehicle for about a week and returned it with it being supposedly fixed. About mid October while driving at 60 mph it shut down again almost causing a wreck went to 30 miles per hour again. Hurt my wife’s neck when it reduced speed so quickly. Took back to dealership and I told them this car is dangerous this was with about 20 k miles Been in shop was told it is scanning with 22 repair codes we have not had the car for 5 weeks and are trying to work with gm and dealer to get us out of it. But as of this report no progress. On interstate in city traffic this car will hurt or kill many people. I’m refusing to let my family or myself drive it. There is no warning when it will flash lights in dash and reduce speed. Also the front crash sensors went out and are currently not working we have all service records and paperwork that has been done including maintenance records We were given vehicle back with no warnings. I went to Nita’s and ran vin and it still shows issues. We are still making payments but driving a loaner car. The car is dangerous. I advised the dealer the first time it happened. I didn’t want it back. My wife went and got it and it sis it the second time and now she agrees it is dangerous contacted GM and they want to fix it but dealer implies they can’t ?..
Start transmission was replaced by dealer at 75 miles. 2nd transmission was replaced at 175 miles transmission was humming and slipped at around 30 to35 mph this was around April of 2024 August 1 2025 while driving at 45 dash board lit up went flashing and suv slowed dramatically down to 30 mph Got to dealership and they kept the vehicle for about a week and returned it with it being supposedly fixed. About mid October while driving at 60 mph it shut down again almost causing a wreck went to 30 miles per hour again. Hurt my wife’s neck when it reduced speed so quickly. Took back to dealership and I told them this car is dangerous this was with about 20 k miles Been in shop was told it is scanning with 22 repair codes we have not had the car for 5 weeks and are trying to work with gm and dealer to get us out of it. But as of this report no progress. On interstate in city traffic this car will hurt or kill many people. I’m refusing to let my family or myself drive it. There is no warning when it will flash lights in dash and reduce speed. Also the front crash sensors went out and are currently not working we have all service records and paperwork that has been done including maintenance records We were given vehicle back with no warnings. I went to Nita’s and ran vin and it still shows issues. We are still making payments but driving a loaner car. The car is dangerous. I advised the dealer the first time it happened. I didn’t want it back. My wife went and got it and it sis it the second time and now she agrees it is dangerous contacted GM and they want to fix it but dealer implies they can’t ?..
On 15 Aug 2025, I was driving this vehicle on Rte 151 in raccoon township with my 2 children when the vehicle suddenly and unexpectedly experienced a “loss of propulsion” with a corresponding uncommanded shift to “neutral”. Attempts to shift the car back into drive were met with a “parameters not safe” caution. I was fortunate enough that the vehicle behind me was able to slow and an accident was avoided. The thought that this could have happened with my family on the highway, during adverse conditions, or any other scenario is frightening to say the least. Other owners of affected models weren’t as fortunate.
On 15 Aug 2025, I was driving this vehicle on Rte 151 in raccoon township with my 2 children when the vehicle suddenly and unexpectedly experienced a “loss of propulsion” with a corresponding uncommanded shift to “neutral”. Attempts to shift the car back into drive were met with a “parameters not safe” caution. I was fortunate enough that the vehicle behind me was able to slow and an accident was avoided. The thought that this could have happened with my family on the highway, during adverse conditions, or any other scenario is frightening to say the least. Other owners of affected models weren’t as fortunate.
I had just backed the truck out of a parking space (while turning) and shifted the transmission into 'Drive' with my foot pressing the brake pedal (not the gas pedal). When I took my foot off the brake pedal in order to transfer it to the gas pedal the vehicle suddenly accelerated forward without my foot ever pressing the gas pedal. The vehicle traveled forward about 20 feet before I was able to stop it by pressing the brake pedal. I am a retired General Motors Safety engineer and I know I was not pressing the gas (accelerator) pedal when this sudden acceleration event occurred. I believe this type of event occurred one other time while I was driving this vehicle. However, I am not as clear about the circumstances surrounding this previous event.
I had just backed the truck out of a parking space (while turning) and shifted the transmission into 'Drive' with my foot pressing the brake pedal (not the gas pedal). When I took my foot off the brake pedal in order to transfer it to the gas pedal the vehicle suddenly accelerated forward without my foot ever pressing the gas pedal. The vehicle traveled forward about 20 feet before I was able to stop it by pressing the brake pedal. I am a retired General Motors Safety engineer and I know I was not pressing the gas (accelerator) pedal when this sudden acceleration event occurred. I believe this type of event occurred one other time while I was driving this vehicle. However, I am not as clear about the circumstances surrounding this previous event.
NHTSA Complaint: Campaign 25V274 Vehicle: 2024 GMC Yukon (VIN: [XXX] , 33,294 miles) GM Case #[XXX] Recall: N252494000 (NHTSA 25V274), issued April 24, 2025; related bulletins N252494001 (dealer inventory), N252494002 (engine replacement) Defect: Manufacturing defects in the 6.2L V8 (L87) engine’s connecting rod and/or crankshaft, risking engine failure and crashes. Issue: My vehicle has been at Royal Buick GMC, Inc. (355 Rte 23 N, Sussex, NJ 07461) since April 10, 2025 (104 days as of July 23, 2025). The recall remedy (inspection for DTC P0016, oil change to 0W-40 if passed, or engine replacement per N252494002 if failed) is unavailable, with no repairs performed per invoice RO# [XXX} (July 22, 2025). The dealership provided a lesser-value loaner, inadequate for a premium SUV. On July 23, 2025, at 5:03 PM EDT, the dealership texted, “Your vehicle is in the shop and should be done first thing tomorrow. I have it schedule for a wash tomorrow. I will follow up mid-afternoon on its status. ty!” Maggie stated they were waiting for the “new car shine to dry.” When asked if the engine was replaced, Maggie said it was “above her paygrade” and confirmed no solution exists, with no timeline for remedy availability. I instructed her I will not accept an unsafe vehicle and to relay this to the service manager. NHTSA.gov [XXX] ) confirms the recall is unrepaired, remedy not available. Communications with GM: July 15, 2025, 3:00 PM EDT: GM Customer Support Supervisor Rochelle confirmed no parts or resolution timeline. July 15, 2025, 3:30 PM EDT: SMS to Tom McGillis, service advisor, requesting update. No actionable GM response. July 23, 2025, 1:32 PM EDT: GM representative Cynthia stated GM had not heard from the dealership and escalated Case [XXX] to internal corporate resolution. No parts or timeline provided. Complaint: GM’s 104-day delay in providing a recall remedy (N252494000/N252494002), inadequate loaner, INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA Complaint: Campaign 25V274 Vehicle: 2024 GMC Yukon (VIN: [XXX] , 33,294 miles) GM Case #[XXX] Recall: N252494000 (NHTSA 25V274), issued April 24, 2025; related bulletins N252494001 (dealer inventory), N252494002 (engine replacement) Defect: Manufacturing defects in the 6.2L V8 (L87) engine’s connecting rod and/or crankshaft, risking engine failure and crashes. Issue: My vehicle has been at Royal Buick GMC, Inc. (355 Rte 23 N, Sussex, NJ 07461) since April 10, 2025 (104 days as of July 23, 2025). The recall remedy (inspection for DTC P0016, oil change to 0W-40 if passed, or engine replacement per N252494002 if failed) is unavailable, with no repairs performed per invoice RO# [XXX} (July 22, 2025). The dealership provided a lesser-value loaner, inadequate for a premium SUV. On July 23, 2025, at 5:03 PM EDT, the dealership texted, “Your vehicle is in the shop and should be done first thing tomorrow. I have it schedule for a wash tomorrow. I will follow up mid-afternoon on its status. ty!” Maggie stated they were waiting for the “new car shine to dry.” When asked if the engine was replaced, Maggie said it was “above her paygrade” and confirmed no solution exists, with no timeline for remedy availability. I instructed her I will not accept an unsafe vehicle and to relay this to the service manager. NHTSA.gov [XXX] ) confirms the recall is unrepaired, remedy not available. Communications with GM: July 15, 2025, 3:00 PM EDT: GM Customer Support Supervisor Rochelle confirmed no parts or resolution timeline. July 15, 2025, 3:30 PM EDT: SMS to Tom McGillis, service advisor, requesting update. No actionable GM response. July 23, 2025, 1:32 PM EDT: GM representative Cynthia stated GM had not heard from the dealership and escalated Case [XXX] to internal corporate resolution. No parts or timeline provided. Complaint: GM’s 104-day delay in providing a recall remedy (N252494000/N252494002), inadequate loaner, INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
I am filing a complaint regarding a potential safety defect in my 2024 GMC Yukon Denali (approx. 25,000 miles), which has been in the dealership’s service department for about 30 days due to a faulty valve body in the transmission system. There is currently no estimated date for repair completion due to a lack of available parts. This is the second time the vehicle has been in the shop for the same unresolved issue. Earlier in 2025, I brought the car in due to driveability concerns and error messages appearing on the dash, but the dealership dismissed it and claimed I had “turned the vehicle on wrong,” despite it having a push-button start. The problem persisted until June 2025, when they finally diagnosed the valve body failure. This issue directly affects drivability and vehicle safety, particularly during acceleration and gear shifting. I am concerned that General Motors is aware of widespread valve body and transmission failures in these vehicles, yet continues to produce and sell new units while failing to ensure parts are available to support timely repairs. It is unacceptable that a major safety-related transmission issue can sideline a relatively new vehicle for over a month with no resolution in sight. GM’s lack of urgency in addressing this defect suggests a disregard for consumer safety and reliability. I respectfully request that the NHTSA investigate this issue as a potential pattern of safety defects in GM’s full-size SUV transmission systems.
I am filing a complaint regarding a potential safety defect in my 2024 GMC Yukon Denali (approx. 25,000 miles), which has been in the dealership’s service department for about 30 days due to a faulty valve body in the transmission system. There is currently no estimated date for repair completion due to a lack of available parts. This is the second time the vehicle has been in the shop for the same unresolved issue. Earlier in 2025, I brought the car in due to driveability concerns and error messages appearing on the dash, but the dealership dismissed it and claimed I had “turned the vehicle on wrong,” despite it having a push-button start. The problem persisted until June 2025, when they finally diagnosed the valve body failure. This issue directly affects drivability and vehicle safety, particularly during acceleration and gear shifting. I am concerned that General Motors is aware of widespread valve body and transmission failures in these vehicles, yet continues to produce and sell new units while failing to ensure parts are available to support timely repairs. It is unacceptable that a major safety-related transmission issue can sideline a relatively new vehicle for over a month with no resolution in sight. GM’s lack of urgency in addressing this defect suggests a disregard for consumer safety and reliability. I respectfully request that the NHTSA investigate this issue as a potential pattern of safety defects in GM’s full-size SUV transmission systems.
The contact owns a 2024 GMC Yukon. The contact stated that while driving 55 MPH, the accelerator pedal was depressed and the vehicle failed to respond, with the vehicle sputtering. The contact stated that unknown warning lights were illuminated, and an unknown message was displayed. The contact pulled over to the side of the road as the transmission shifted into neutral. The vehicle was shifted into park and turned off. The contact then attempted to start the vehicle; however, the vehicle failed to restart. The contact then towed the vehicle to the dealer, and a diagnostic test was pending. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 11,000.
The contact owns a 2024 GMC Yukon. The contact stated that while driving 55 MPH, the accelerator pedal was depressed and the vehicle failed to respond, with the vehicle sputtering. The contact stated that unknown warning lights were illuminated, and an unknown message was displayed. The contact pulled over to the side of the road as the transmission shifted into neutral. The vehicle was shifted into park and turned off. The contact then attempted to start the vehicle; however, the vehicle failed to restart. The contact then towed the vehicle to the dealer, and a diagnostic test was pending. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 11,000.
The motor is randomly revving at braking so far only under 10 miles an hour. Yesterday it stalled twice on me and cut off braking under 10 miles an hour. I had to come to a complete stop while restarting the vehicle. Definitely has me worried if it happens on the highway or higher speeds.
The motor is randomly revving at braking so far only under 10 miles an hour. Yesterday it stalled twice on me and cut off braking under 10 miles an hour. I had to come to a complete stop while restarting the vehicle. Definitely has me worried if it happens on the highway or higher speeds.