2017 GMC SIERRA 1500 Complaints

#1 While merging onto the highway, the vehicle began to shake violently and have a sudden lose of power due to a misfire on cylinder 6 and 4. I was unable to merge onto the highway as the vehicle would not accelerate almost causing me to be hit from behind. I was able to get the vehicle off to the shoulder to avoid an accident as it was barely able to stay running and the CEL was flashing. The failed parts (AFM lifters/push rods and VLOM) have been removed from the engine and saved for review. #2 My family's safety was put at risk as the vehicle had a sudden lose of acceleration while trying to merge on the highway almost causing us to be hit from behind. #3 I spoke with my local GMC dealer and explained the situation and diagnosis that I have completed on the vehicle. That wanted me to pay out of pocket to tow the vehicle in and would not cover anything as the vehicle is barley out of powertrain warranty (72695 miles). I have been an engineer in the automotive industry for almost 10 years and can properly diagnose a vehicle and the issue it has. Trouble codes were provided along with pictures and videos as evidence. I understand when something is a safety issue and needs to be addressed as this is a common issue with GM 5.3l and 6.2l engines. I then spoke to GM corporate (Mandy, case# 9-12424996557) and once again they wanted me to pay for everything out of pocket even though this is clearly a safety concern with their product and the diagnosis had already been completed. This vehicle has all the maintenance records since it rolled off the showroom floor, proving that the failure is not related to neglect or poor maintenance of the vehicle. There is very clearly a design issue or manufacturing issue on this components. #4 Components are available for inspection by mfg. #5 There were not warning lights or any other indicators prior to the failure. Oil pressure was at 40PSI and engine temp was ~200F. All within the normal operating windows of the vehicle.

The contact owns a 2017 GMC Sierra 1500. The contact stated that on several occasions while driving at low speeds, the brake pedal was depressed, and the pedal remained on the floorboard. Additionally, the vehicle failed to slow down as intended. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 50,000.

In January 2024, I parked my truck in my garage and shortly after I smelled an electrical burning smell in our house. When I opened the garage, it had smoke throughout the garage and a very strong odor of electrical burning smell. I moved my vehicle outside and tried to find the source, but it was too strong to narrow it down, and the garage smelled like burnt electrical for days. I took the truck to a service shop and they could not find anything wrong at the time. Today, May 2024, I was having trouble getting my trailer lights working. Upon further inspection, I discovered the 7-way interface wiring harness on my vehicle had electrically shorted out and melted a hole in the plastic housing and left melted plastic on the truck frame. The tag on the wiring harness states TAG #138359 7-WAY INTERFACE HARNESS W/O 134971. I believe this electrical short/fire should be part of the NHSTA Recall 18E-014. That recall states those are aftermarket harnesses, but the harness on the vehicle in this complaint is original to the vehicle and was installed by the manufacturer. I plan to take the vehicle back to the dealer to have the harness replaced, but I am expecting pushback since the NHSTA recall states this is only aftermarket harnesses.

Experienced hard shifting in my transmission a couple before it all of the sudden it made a thing noise and didn’t want to move forward to easy. Babied it home and by then it was whining and whistling all the time. I Quit driving it immediately and had it towed. Being only a 2017 I can’t believe this happened. Plus I had a 2014 prior to this and I had the same issue but traded it off before it went all the way out. After going to social media I am finding out that so many people with mid to late model 2000s have had this same issue, even family. Plus I was told by 2 different transmission places this is very common in these with Chevy and GMC model trucks. How could this be going on? I am assuming because people don’t know to report. Being on disability and a fixed income this took a hit to my bank account, actually a home equity loan.

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.

I purchased the vehicle in November or December 2022. Since then I’ve had problems with my transmission. The torque converter was replaced 2 times, it’s been in the shop 5-6 times and nothing fixed under the warranty when I purchased it. Finally the dealer I purchased from said they won’t take the vehicle back and won’t spend any more money on fixing the truck. Now it has become on my dime to figure it out since I gave up trying to have a shop diagnose and fix it. The last shop said I would have to pay to have the transmission removed and possibly have the valve body replaced since the dealer I purchased it from gave the second shop one chance to get it right. The transmission downshifts hard and clunks since the first day of purchase. Makes a weird wining noise still til this day. I have spoken with the owners of the dealership and they did not seem to care about my problem.

on [XXX], i remote started my vehicle about 10 minutes prior to leaving work. when i left and walked out to my truck i opened the driver side door and noticed smoke in the vehicle and an odd smell. upon looking around the truck i heard a loud pop and the passenger side of the rear sliding back glass shattered. upon further investigation this has been an ongoing issue with gm trucks and even 159,000 have been recalled in Canada and there has been no recall issued in the United States. the major safety concern is that in the back seat of my vehicle i have two car seats for each of my toddler aged sons. i am just thankful that neither one of them were in the vehicle when this happened. i brought the vehicle to the dealership and they told me that there was indeed a short in the wiring going to the back sliding window and defroster but there was nothing they could do other than replace the glass. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Truck has always shifted rough, now with only has 102,000 miles has been serviced regularly exclusively at the dealership. It started slipping gears and I was just informed by the dealer that the torque converter detonated and the entire transmission must be replaced.

The transmission is shuddering, hard shifting, shuddering and lunging into gear. It is the 6L80 transmission Also has little to no power, took it to the dealership for diagnosis and they say the transmission is bad, torque converter is also bad sending metal throughout the rest of the transmission.

Started truck for 10-15 minutes with front and rear defrost on to remove ice from glass. Upon entering the truck, there was a smell of wiring/plastic burning. Smoke was coming from the bottom corner of the rear sliding window. I immediately shut off rear defrost and then shut my truck off. Then the driver side rear glass panel popped and shattered completely.