A loud clunk is heard from the transmission when shifting from one gear to anther after having to reduce acceleration.

- Salinas, CA, USA

At slow speeds, multiple times, I have had the truck completely have an electrical failure and the engine shut off. I have replaced the negative battery cable and ensured all connections are good. This has happened on streets when turning and in parking lots. When this happens all of the screens in the truck flicker and the service stabilitrack light comes on and then everything goes out, to include the engine. Myself, my family, and other drivers have been out at risk when the truck completely shuts off on a street. The dealership has not been able to give me an answer. There are many forums online where the 2014-2018 year models of this and similar GM vehicles have had the same problem. We need a specific fix for this before someone gets seriously injured or killed.

- Little Rock, AR, USA

Transmission lost power

- Alliance , NE, USA

Transmission problems

- Johnston , RI, USA

I am losing engine power. My OBD2 gives me P2138 and P0700 codes. I have changed the accelerator and knock sensors.

- Ypsilanti, MI, USA

The contact owns a 2014 GMC Sierra 1500. The contact stated while driving 50 MPH, the transmission inadvertently shifted to neutral(N) and the vehicle stalled. No warning lights were illuminated. The contact related the failure to NHTSA Campaign Number: 14V374000 (Power Train). The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure. The failure mileage was 112,000.

- Tampa, FL, USA

My lifters bent and my valves collapsed. I have had the vehicle repaired twice. No engine light warning. Also in Nov of 2022 oil is leaking into my cylinders. Common problem on several GM forums.

- Bartlett, TN, USA

The contact owns a 2014 GMC Sierra 1500. The contact stated while his wife was driving approximately 65 MPH, the vehicle began to vibrate and made loud grinding sounds. The contact stated that the vehicle began to lose motive power. The contact's wife was able to exit the highway; however, the transmission was slipping out of gear. The contact stated no warning light was illuminated. The contact stated that the failure had become constant. The vehicle was not taken to a local dealer or independent mechanic to be diagnosed or repaired. The manufacturer had not been informed of the failure. The failure mileage was 94,302.

- Benton, AR, USA

Going under 15mph, applying the brake causes the pedal to become stiff and lock up and not work. This has caused me to almost hit someone in traffic. I immediately got off the road and got my vehicle to a safe location off the road. Communicating with a dealer today to confirm possible recall issue or potential repairs.

- Elgin, TX, USA

My truck goes into -??neutral-?? or doesn-??t have power while driving at times and can cause a car crash.

- Klamath Falls, OR, USA

My vehicle recently started "shuttering" while driving. Service report says it is a "common GMC issue with the Torque Converter", $3200. They also reported a "substantial leak" in the radiator, and again, says it is a very common fault of GMC Trucks. And another $2700. If these conditions are as common as they indicate, why are there no corrective measures?

- Kingsford, MI, USA

I was driving and was almost home when I heard a pop and started getting jerked back and forth and then just slowed down almost to a complete stop with vehicles approaching quickly almost causing a multiple vehicle pile up I-??ve heard multiple people complain about the particular transmission that is put in these gmc and chevy 1500s and am just confused with all of the problems I see on the internet and hear from peers in person why it has not been recalled yet if need be I will make a survey of gmc and chevy owners to let it be known that the transmissions on these vehicles were poorly built and need to be recalled before anybody has this problem that I had today

- Aragon, GA, USA

transmission shifting rough

- Tn Ridge, TN, USA

From time to time the vehicles power system will surge, blink, and generally act up. The priblem is intermittent. The check engine light will come in then go off, the engine has completely cut off several times while driving, the transmission acts up, radio will turn off, 120v outlet will turn off, occasionally the vehicle will fun for 5-15 seconds after being turned off and then sputter off. And 95% of the time the truck is absolutely fine.

- Olivet, MI, USA

The contact owns a 2014 GMC Sierra 1500. The contact stated while approaching a stop sign, the vehicle began to shake forcefully. The contact stated no warning light was illuminated. The vehicle was taken to the local dealer Liberty Buick GMC (9028 E independence blvd, matthews, nc 28105, (704) 708-8000) however, the mechanic was unable to duplicate the failure. The contact stated he continued to experience the failure. The contact also stated while driving at low speeds, there was an abnormal sound coming from the front driver's side wheel axle. The vehicle was taken back to Liberty Buick GMC where the mechanic was unable to duplicate the failure. The vehicle was then taken to griffin Buick GMC (2500 w roosevelt blvd, monroe, nc 28110, (704) 289-3135) where it was diagnosed with needing the front driver's side strut to be replaced. The vehicle was taken back to Liberty Buick GMC and the repairs completed. The contact also stated while driving at an undisclosed speed, he heard an abnormal sound coming from the vehicle. The contact stated he had the tires replaced and an alignment performed but continued to hear the abnormal sound. The vehicle was taken back to Liberty Buick GMC and the contact was informed that the gearbox needed to be replaced. The vehicle had not been repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 87,000.

- Wingate, NC, USA

The vehicle's transmission makes clunking sounds, and jerking movements when accelerating and decelerating (highway). When stopped on an incline the vehicle drifts backward, once your remove your foot off the brake (street). The vehicle has rolled backwards while it was fully parked and unoccupied.

- Bear, DE, USA

I was driving down the road and all of the sudden it was if my transmission disengaged and my car lost power. It then automatically came back on and the 'service stabilitrak' lights came on. I nearly avoided an accident and was able to pull off onto the side of the road.

- Crown Point, IN, USA

I have had to replace my condensing unit two different times. Once at 75,000 miles, which was covered by my extended warranty that I purchased, not by GM, and the other broke at 107,000 miles in the exact same spot, which I had to pay for. This is a joke! I have also had to replace my oil cooling lines two different times, which were also not covered under warranty.

- Carrollton, TX, USA

Took the truck to get a diagnostic check due to the truck in driveway would not go into reverse so husband put it in drive to pull up a little to see if it would help to then go into reverse, instead, the truck jerked so hard & almost threw my husband & son into the garage door that morning. Husband & son came back in all shook up. The scan diagnostic code-chck showed: Trans fluid-indeed full; but way burnt; needs transmission; front pump making noise in transmission; torque converter; exhaust shows signs of back pressure-and one running hotter than the other; the left side running 100+ hotter than the right - needs transmission assembly removed & repaired; reman GM trans; Y-pipe w/both converters; fluids flush nuts bolt gaskets. I was told it would not be a good idea to drive it. I am retired military and maintained the truck throughout my military career, but no warnings showed on the dash reader for something wrong with transmission. It is a 2014 GMC Sierra 1500 slt 5.3L V8. VIN#[xxx]. need help if this issue has ever been placed on the recall list? if not, it should be. This issue could kill someone if it were to jerk while driving on the road. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Saint Robert , MO, USA

2014-2015 GMC Sierra were produced with a known faulty A/C condenser with a bad weld that causes an A/C system leak requiring replacement. There has been an overwhelming failure of the product across the country, so bad so that it even made the news. GM became aware of this issue and sent new (properly produced) condensers to their production lines first, leaving hundreds of GMC owners without A/C over the summer. They put out a "special recall" on a very small number of vins saying it "may" happen in other vins. There is an overwhelming volume of complaints online (including myself) where GM is acknowledging this issue but refusing to cover the replacement cost of their faulty part for hundreds of owners having this issue. This repair cost me a little over $1300. In the same service visit for my ac condenser it was identified that my radiator was leaking. This was due to a faulty thermostat causing stress fractures in the radiator causing coolant to leak. This issue has also been identified by GM however only a select few VIN's received warranty recalls. My total repair cost to fix both issues was in excess of $4000. Both problems are known to GM yet they have not remedied the issue for everyone.

- Lowell, MI, USA