Vehicle Speed Control Problems of GMC Sierra 1500 - part 1

I am writing to express my extreme disappointment and serious concern regarding a critical safety failure I experienced with my 2025 GMC Sierra 1500 denali unlimited (VIN: [xxx] ), which I purchased brand new in April 2025 from cavender GMC, san antonio, TX. On Friday, [xxx], with fewer than 9,000 miles on the vehicle, I was driving on the highway at about 65 mph, with my minor son in the vehicle when the dash suddenly displayed a traction control (trc) fault message, followed immediately by "acceleration is limited. " the truck experienced a severe and unexpected power loss, severely restricting my ability to accelerate or maintain safe highway speeds. I was forced to pull off the road abruptly to avoid a potentially dangerous situation. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Driving on the highway under normal driving condition, my check engine light came on and said service transmission. This then put the truck into "limp mode" and I was stuck going 60mph in a 75mph zone. Dealership scanned and found that the coolant sensor control flow valve is faulty. This part is in such demand for these vehicles that it is unknown when the part will be in.

See all problems of the 2023 GMC Sierra 1500 🔎.

I am the original owner of a 2018 GMC Sierra 1500 with the 6. 2l l86 engine and 8-speed 8l90 transmission. I began experiencing severe transmission shuddering and harsh shifting, especially at lower speeds or under light acceleration. When the issue occurs, I press the gas and the engine revs up to 6,000 rpm without reaching 20 mph, making it extremely difficult — and dangerous — to merge into traffic or cross intersections. This issue has worsened over time and is now a critical safety concern, especially with children in the vehicle. I have researched this issue and found that many owners report the same transmission defect, and there is an open class action lawsuit and a gm technical service bulletin (TSB #18-na-355) describing the exact symptoms. The vehicle has become unsafe to drive. GMC should issue a recall or mandatory repair program for this known defect before someone is injured or killed.

See all problems of the 2018 GMC Sierra 1500 🔎.

I was driving with my wife about to merge into traffic on the interstate when I had a huge power loss. It was a busy part of the interstate where I could have been ran over. There was a lot of traffic and was fortunate the semi driver was alert and slowed down. I was not aware of any failures of this motor or received any notices from gm. After conducting research I found that this was a know issue that gm failed to report. My truck has been serviced regularly and until that point had not given any signs of a upcoming failure, I have read that gm is looking into other years such as 2019 which mine is. I have had no luck with gm customer care with the only response being I need to crunch the numbers from my claim advisor. I have the 6. 2 l87 motor and know of the clip failure do to poor assembly and parts and debris getting into the motor causing the failure. I am looking to report this and request any assistance available. My first stop was the dealership, then gm customer care.

See all problems of the 2019 GMC Sierra 1500 🔎.

During a turn in the parking lot my vehicle would not allow me to turn something with traction control came up on the screen. The past few days the car got stuck at 0 rpms while driving and did not feel I had adequate power and other times has stalled.

See all problems of the 2014 GMC Sierra 1500 🔎.

The engine coolant flow control valve position sensor is faulty. I brought mt truck in to my dealership and I have been waiting for over a month to get the issue fixed because “the part is on backorder”. This issue makes my truck sound like a jet engine because it makes the truck think overheating and causes the fan to come on at full blast. After drivinf for awhile it goes into “ reduced engine power mode” which is totally unsafe because it reduces the horse power to that of a lawn mower. It takes about 30 seconds to get from 0-60, so merging onto freeways or in conditions where you need extra speed its completely useless and increases the scenario of being rear ended, immensely.

See all problems of the 2021 GMC Sierra 1500 🔎.

Total loss of power while in motion on highway going 70 when first happened, got video of problem for shop while going lower speeds. Truck will loose all power the dash will turn off and then turn back on sometimes the engine will cut out completely.

See all problems of the 2017 GMC Sierra 1500 🔎.

The steering assist fails, power and steering is reduced at driving speeds. Steering wheel locks and vehicle looses voltage and stalls while driving at low speeds and have been close to collision. Vehicle was inspected by group one GMC in el paso texas. They did not fix recall because it "did not pertain to my VIN" . There is a recall for the steering assist on all GMC 2015 1500, but not for my GMC 2015 1500 for some reason. Whether it was manufactured in the us or the moon its still a GMC 2015 1500 with faulty steering assist system from the manufacturer with an open recall. Thanks for your help.

See all problems of the 2015 GMC Sierra 1500 🔎.

The vehicle was traveling over a hill, and it failed to shift gears downwards when traveling over the hill. The vehicle’s rpm’s shot up to 4000+ and jolted the truck forward without pressing the gas pedal. The vehicle made a loud noise and would not accelerate in the middle of the road. The vehicle would only accelerate after giving it minimal gas from the pedal. The truck then failed to accelerate on the entire drive to the destination and failed to enter reverse upon arriving to my destination.

See all problems of the 2024 GMC Sierra 1500 🔎.

I have experienced several occurrences of unintended acceleration while operating the vehicle at low speed. Two recent examples; 1) the truck accelerated rapidly while I was driving into my garage, and 2) the truck accelerated suddenly when pulling forward out of a parking spot in the morning shortly after starting the vehicle. In all cases, a hard application of the brake pedal slowed the vehicle. I considered whether this was operator error, possibly engaging cruise control inadvertently while turning the steering wheel, but the incident this morning does not support that potential cause. I have not spoken to the dealer about this issue.

1. During December 2024, noticed the wrap or called grill part at the back of the truck detached 2. On 5th February, got a warning :reduce acceleration with caution, when I pressed gas pedal, could not go faster than 35mph, the truck was shaking really hard. It has been in the dealership waiting for valve body until today 13th March, still no idea when it will be fixed.

While driving on the interstate, my vehicle started losing speed. I pulled over to the shoulder of the interstate and put in neutral so I could coast further to the exit ramp where I would be in a safer location. My vehicle has 14037 miles on the odometer and has now gone through 2 engines. It has always been serviced by gm.

The contact owns a 2025 GMC Sierra 1500. The contact stated while driving approximately 4 mph and turning left into a parking spot, the vehicle independently accelerated. The contact stated that the brake pedal was depressed. The contact stated there was no warning light illuminated. The contact stated that the failure was intermittent, but the failure occurred while slowing down under 5 mph and turning to the left. The contact had taken the vehicle to a local dealer; however, the failure was not duplicated. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 17,000.

On the morning of 1/19/25, my 2021 GMC sierra 6. 2l at4 went into limp mode heading south on hwy 207 in leavenworth, wa at approximately 60 m. P. H. Fortunately, I was able to avoid a rear end collision. I quickly turned the truck off in the middle of the road and restarted it with a cel. When I returned home almost 180 miles away, my local mechanic diagnosed a code p0303 and cleared it. Since, the truck has continued to shutter at various speeds without throwing a code. It is currently at haselwood GMC in bremerton, wa being scanned, recorded, and findings set to gm waiting for resolve. I have notes, exact dates, times, call records, return voice mail messages, and dealership personnel spoken to, etc. The dealer’s lead technician and I were able to replicate the shutter on a road test together on 1/27/25 at 3 p. M. After having driven just 10 miles. During my visit on the morning of 1/30/25, the lead technician stated he has since been able to replicate the shutter seemingly getting worse. I was strongly encouraged by the service manager, service writer, and lead technician their collective “personal recommendation” was to not take the truck back. Haselwood has had the truck since 1/27/25. Still awaiting a response and resolution.

When accelerating it will over rev and then slip and then punch foward I had a diagnostic did and the sensor in the transmission aren't working properly and then when just driving my etrak also randomly went out and I can no longer active cruise controll.

The contact owns a 2019 GMC sierra. The contact stated that while driving on the highway at 40 mph the vehicle proceeded to jerk and shift into the lower gears, the vehicle's acceleration speed was reduced to 15 mph. The service parking brake and the esc light were illuminated. The contact proceeded to drive to their residence, whereupon parking the vehicle the contact proceeded to inspect the vehicle from outside, the contact noted that there was a distinct smell of something burning, and upon inspecting the rims of the vehicle they were very hot. The vehicle was taken to a local dealer where the vehicle was diagnosed the contact was advised that there was nothing to be found wrong with the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 58,000.

Tried to accelerate and heard a loud pop and the truck didn’t accelerate. Pretty much went idle in the middle of the road. The check engine light, the traction control light, and the abs light all came on. I would press on the gas and it would rev but nothing would happen till a few seconds later the rpm’s would shoot up and you could tell it was trying to get going but didn’t very slowly and I would hear a clicking noise every time it was around the second gear. It put my children and myself in danger because traffic was heavy with vehicles going 70+mph merging into one lane. Took it to a dealership and they stated it was the the push rod and camshaft were damaged and all 16 lifters should be replaced and camshaft also. No, the vehicle has not been inspected by any of those except a car dealership and a mechanic. This problem first appeared the day it happened and continued after. Even took it to a mechanic and had all 16 lifters changed and problem still persists. Spent over $6,000 on a brand new truck and it is still undrivable because every time you get in to drive it the cylinder #2 misfires.

My brakes failed 2 times. One time I almost got into a horrible wreck with my daughter in the truck. "brake system failure" " max speed 43mph" I have not had any brake work or anything done. The dealer is trying to charge me to replace the whole brake system when [xxx] this says to reprogram. Still waiting on GMC to tell me if it's covered under warranty. From my own research this has been a major problem for hundreds of people if not more. I could have died because of a faulty brake system or a bad software update. I need help with this and so do the countless other 2020 gm owners. There is a recall on the 2019 for the exact problem but not the 2020s. Gm safety recall n192268090 please advise information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2020 GMC Sierra 1500 🔎.

System/component: service brakes, hydraulic summary: recurrent loss of brake performance and vibration in a 2024 GMC Sierra 1500. Front pads wear to 1–2?mm and front rotors become “very warped” within short mileage intervals; right?front caliper previously seized; pad?sensor circuit fault also documented. Multiple dealer repairs under 30k miles; condition recurs. Increased stopping distance and steering vibration at speed. Chronology (dates / approx. Mileage): 09/06/2024 (~10,437): front brake repair; 01/13–14/2025 (~16,239): rf caliper seized repaired; 05/05–06/2025 (~20,734): pads 1–2?mm and rotors very warped; 08/15–18/2025 (~27,574): pads again ~2?mm and rotors very warped. ( emissions soot collection and engine deceleration is another issue in the diagnostics. ) dealer: Chevrolet Buick GMC of bellevue, wa. Status: defect continues after multiple repairs; safety concern due to stopping distance and vibration.

To whom it may concern, this is a brand new 2024 GMC sierra at4 diesel truck with 4,000 miles. The first incident occurred when I was doing about 5 mph. The truck maintained its speed without my foot on the gas pedal and the cruise control was not on. Then when I tapped the gas pedal, everything return to normal. The second incident was about 2 weeks later in which the same thing happened. The third incident which was about one week later, I was doing about 5 mph and the truck accelerated on its own. I let the truck accelerate to approximately 28 mph. At that point I hit the brakes to stop the vechicle and pulled over. The truck was idling very high so I turned off the engine. All the ignition lighting remained on, but the truck would not restart. Even after removing the keys from the vehicle the ignition lighting remained on. At that point the truck had be towed back to the dealership which is rainbow Buick, GMC in covington, louisiana. I've been told by the rainbow service department that they do not know what's wrong with the truck. It's been sitting there for 10 days now was a dead battery. My salesman who I don't really believe, said he has the exact same truck and it happen to his tuck at 30,000 miles. I file a claim with GMC customer support but have yet to hear from them. I'm obviously very disappointed with my new truck, my salesperson, and service department. If there's anything you can do to help please let me know! thank you, [xxx] cell: [xxx] email: [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Driving on the highway coming home from brother in laws house and the truck suddenly popped check engine, brake service and esc lights came on dashboard while engine power was reduced causing sluggish performance. Made it home and put a scan tool and pulled a cylinder 3 misfire. Replaced spark plug and confirm it’s not an ignition coil problem. Brought to dealer and was confirmed the dod lifter failed in other words afm. Overwhelmed and couldn’t do anything but to pay and get truck back to working order told go ahead for replacement of parts for nearly $6k.

The vehicle would shudder when trying to accelerate. I almost was hit by a semi truck trying to merge onto the freeway. Made an appointment with the mechanic then a couple days later I was at a stop sign and the vehicle would not accelerate at all. I placed in park the tried shifting back into drive and still nothing. I had to turn the vehicle on and off twice before I was able to shift it in drive an it actully would accelerate. Even then it would shudder and not accelerate fully. Very dangerous. Just hit 100k miles. GMC certified mechanic said the transmission is shot and needs to be replaced. Cost to replace over $6,000. 00 bought the truck in 2020 for $35,500 and just paid it off.

The contact owns a 2015 GMC Sierra 1500. The contact stated while driving 75 mph, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. Additionally, the contact stated that there was an abnormal squeaking sound coming from the vehicle. The vehicle was driven to the shoulder of the roadway. The contact stated that the failure reoccurred while hauling a trailer full of horses. The vehicle was towed to the contact's parent's residence. The vehicle was diagnosed by an independent mechanic and was diagnosed with a failed torque converter. The contact was informed that the torque converter needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 129,000.

Back window frame crack led to water intrusion which flooded electric module controlling speedometer and adaptive settings. Extremely unsafe driving with faulty electrical components unknown to me. Insurance and dealership told me this is a common GMC occurrence. Cost is near $10,000 to make truck drivable.

Shuttering while in motion at a speed of 35mph or above. My 2020 GMC Sierra 1500 at4 carbonpro while driving at or above speeds of 35mph experiences a hesitation and severe shuttering while trying to maintain any speed of 35mph or above. The hesitation causes extreme vibrations and hesitation when lifting or applying foot to the accelerator. This happens in any drive mode also with cruise control on or off as well as shifting into low and being in any gear trying to prevent it. It also does this on any road and condition. It feels like a slip in the transmission or torque converter, possibly could be the rear end or variable valve timing as well. And when taking of from a red-light or stop sign it slips as if the truck has lost traction, but it hasn't. This is very dangerous and could be the cause of a serious accident when trying to accelerate. If your traveling at hwy speeds it feels as if the brakes are being applied and the tires are going over a washboard which could cause a collision, tire wear, or driveline damage.

The contact owns a 2024 GMC Sierra 1500. The contact stated that while coasting at speeds of approximately 1- 3 mph, and gently pressing the accelerator, the vehicle suddenly surged forward and accelerated quickly. The accelerator pedal was released, and the brake pedal was depressed, allowing the vehicle to come to a stop. The failure had occurred approximately 5 times within a year and a half. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 3,000.

2018 GMC seirra 1500 8 speed transmission. Making unsafe conditions while driving transmission tends to make hard shifts, jerks, hesitation when moved into gear, gets worse when stopping momentarily at stop lights and then trying to accelerate vehicle will not move. Makes hard shift and jerks then will accelerate in an unsafe manner.

Traveling at 70 mph on cruise control, tapped breaks to turn off, multiple warning lights flashed, vehicle lost power, and breaks with multiple messages including “break system failure, top speed 62 mph”. I lost all breaking control on the highway and nearly crashed into other vehicles due to inability to stop. Was able to pull over, turn off vehicle, and turn back on, when the breaks were working again but the vehicles acceleration was very slow. Currently at authorized repair shop. When dropped off, there were 8-9 active codes.

When I turn the steering wheel, the ac turns off, lights turn off, the computer screen turns off, steering wheel gets hard and does a jerking movement. The truck turns off too and then suddenly turns on. This can cause a death. If this happens in a highway or a street where speed is high this can easily cause a death. . Fortunately this has happened going at 30 mph and no one close at the time and also at a drive through fast food restaurant. It has not been confirmed by the dealer but I will soon have to take it. The only light that comes up is the stabilitrak. . But it only lights up when it happens and then it goes away.

The contact owns a 2023 GMC Sierra 1500. The contact stated while driving approximately 60 mph, the vehicle inadvertently decelerated to approximately 30 mph and went into limp mode. The check engine warning light, the service power steering warning light, the service transmission warning light, the low tire pressure warning light, and the traction control warning light were illuminated. The contact stated that a message was displayed on the instrument panel to “service 4-wd and “reduce acceleration - drive with care. The contact stated that the climate control system increased to 76 degrees. The vehicle was taken to the dealer where it produced codes: p00ff, p1789, p25a2, u0073, u0402, u0418, u1610, u1643; however, the failure could not be duplicated. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 5,000.

Over the last 3 years we have had ongoing issues with our truck going into limp mode. We have spent thousands of dollars at dealerships and mechanics trying to troubleshoot the issue. Several occasions while trying to merge onto the freeway the truck would slip into limp mode causing us to have other drivers slam on their breaks almost hitting us. We had 2 cars in January of 2023 veer off the side of the road. We pulled over and thankfully they missed hitting one another. We just couldn't speed up to get out of their way. We cant believe their hasnt been a safety recall on the tcm for these trucks. GMC started doing service bulletins in 2013 about the tcm causing the limp mode issues. There are dedicated facebook groups with over a 1,000 followers who are experiencing the same issues with these tcm's. Someone is going to die if they havent already. Several collisions, involving the years affected, are being re-investigated to determine why the vehicle slowed abruptly causing a fatal accident. A class action lawsuit is gaining momentum because gm will not do anything about the tcm.

See all problems of the 2010 GMC Sierra 1500 🔎.

I was stopped at a red light and when the light turned green I accelerated and the vehicle shut off and then came back on. When the vehicle came on I had a service esc light and a system break failure warning telling me not to exceed 62mph. I made it back to my house driving with extreme caution. The breaks were very delayed while driving.

Dashboard instrument panel all lights and gauges goes out while driving down the road when vehicle is turned off a clicking noise is made in the dash. This issue causes when driving down the road, not knowing the speed because the speedometer is out or how much gas the vehicle has, or any other readings, and at night all lights go out, not able to see while driving down the road.

See all problems of the 2009 GMC Sierra 1500 🔎.

Just purchased this used vehicle in December 2022 with high miles (202000) with a dealers extended warranty. Problem has happened twice in 2 weeks. While backing up slowly and turning my wheel the vehicle stalled and service stabilitrak came across the dash as it died. Then upon restarting it told me to roll drivers window down and up and the memory seat function cleared as did my clock. Like it had a battery replacement and reset to factory. Took into a GMC service shop where they found code p0700 and p0711. They were able to replicate my concern. Telling me to replace the transmission harnesses and that it is not covered under my extended warranty for powertrain. Going to cost me $1500 in repairs. After extensive research I see this is a common problem yet no recall has been issued for my 2016 GMC sierra crew cab. Very frustrating!!.

See all problems of the 2016 GMC Sierra 1500 🔎.

Sensor temperature transmission.