Truck will experience complete electrical failure while driving in motion at various speeds. Failure lasts between 5-10 seconds but causes severe difficulty as steering is affected. A web search reveals grounding issue as potential cause. Manufacturer has not notified me of this particular issue and or any recall effort and I know of no existing recall effort for this issue.

- Montgomery , AL, USA

While operation my 2015 GMC 1500 DENALI Pickup at normal conditions my vehicle produced a engine light. I was three blocks from my office so I proceeded there immediately to have my vehicle scanned for codes. This is where I found out that cylinder #7 had an issue. This cylinder is part of the AFM system. I had the vehicle towed to Galles Chevrolet for diagnostic services and an estimate for repairs. Up receiving the results (which) I will attach. Bank 1 and possibly Bank 2 lifters and springs have failed. Thus possibly cause damage to the cam shaft. While I am aware that my vehicle is out of powertrain warranty (5 years / 100,000 mile), my vehicle only has 52,000 miles on it and very very well taken care of at all times. I am also aware of a class action law suite that pertained to the same exact issue on gm products from 2004-2014. Also service bulletins were produced by GM pertaining to this issue. Now I have been out of service of my vehicle for 3 1/2 weeks not to mention a potential $7000 repair, that should have never been in the picture! Poor quality control on products for potential profit gains have cost many many customers pain, anguish, and money.

- Albuquerque, NM, USA

Incident has happened multiple time. When put on the computer to see if problem, does not show anything. Incident: 1)Driving on highway and truck completely loses power and electrical notification come on. Have limited power and electrical notification stayed on continually. Had to take in for repair. This happened May of 2018. 2)While driving on highway, used signal to change lanes and lost engine power. Had some electrical flickers and steering issue. Multiple times in last 6 months, sporadic. 3)When signaling and turning steering wheel, lost engine power. Also had problems with electrical/computer issues. Multiple times in last 6 months, sporadic 4)When slowing down, signaling, and turning steering wheel, after turn completed and start accelerating, transmission seem to be missing. This issue is sporadic and has been doing this since I have had the vehicle new. All these incidents have happened sporadically, with not pre-warning indicators and when having the truck check on the computer, with the exception of (#1) showed no issues.

- Hominy, OK, USA

At times my vehicle will lose power steering, turns off stabilizer traction control light comes on.There is no warning and does this more at low speed turning.you can't turn the steering wheel when this happens and the breaks hardly work.I have 30,000 miles on vehicle I had this vehicle towed to dealership in 2016 they charged me diagnosed but didn't tell me anything more it's only been to the shop for recalls I do my own maintenance

- Desmoines, IA, USA

Power steering goes out and at time turn truck power off whenever i attempt a slow tight turn like backing into my driveway or making tight turns going into parking lots and/or spaces. Most recently, when attempting a u-turn at a busy intersection, power steering went out and engine died. I had to coast to the side to avoid moving traffic. Each time this issue happens i hear 3 dings all my dash & screen lights flash off then on with clicking noises. Dash info changes from speedometer to radio setting. If i look at screen quickly enough when this happens i would sometimes read -??rear parking assist unavailable-?? or something like that. If air conditioning is on it would turn off then on. Doors will unlock then lock, all this happening simaltaneously while attempting to make a turn

- Woodbridge, CA, USA

I have noticed over the last few weeks I am losing radiator fluid. Its slow but noticeable. Engine temperature rises and fan stays on. My 2015 GMC Sierra 1500 only has 50,150 miles on it, and started well under 50,000. It looks like the leak is from upper contact points of Radiator and frame. I have come to find out that GMC has put a notice out on this issue and put a recall/repair out on the 2014 GMC Sierra 1500 for the same issue. Its a know defect. ( I WILL ATTACH COPIES ) I went to the dealer and was told they would fix the 2014 but have not issued a fix for the 2015. "Not enough complaints"? Its a very expensive fix for a KNOWN manufactured defect but GMC (AND CHEVY TRUCKS) want more complaints.... so here is my filing. Kind of a silly game they are playing when they know it should be a recall issue.

- Hampstead, NC, USA

Radiator coolant leak, replacement Radiator with 11000 miles has begun to leak now.. Fuel injectors had to be replaced at 60000 miles. Blue Paint is peeling off in sheets

- Turin , NY, USA

Radiator forms stress cracks from constant thermostat cycling. The resulting cracks cause the radiator to leak. GM has issued special coverages for certain models but doesn't acknowledge it is a very common problem on other models outside the coverage.

- Hemlock, MI, USA

I took vehicle to dealer for test drive for trade in purposes and was informed that my radiator leaked and it was a problem with 2015 GMC Sierra and needed replacing for $1400. There is a recall for same problem with 2014 year but not 2015 and this should be corrected because it is a known defect and consumer should not have to pay for defective part.

- Duluth, MN, USA

While driving down the streets, truck loses all electrical power, loses power steering, radio, gauge cluster power and engine dies. Happened several times today. It immediately all comes back on(so far) but could definitely be a safety concern if the conditions were right.

- Greenwood, AR, USA

Violent and erratic shifting during acceleration and deceleration... a simultaneous pop and jerk happens... also when accelerating and hitting passing gear the truck seems to stall out and then quickly engages to apply more power than expected... this can be dangerous for a driver attempting to merge onto highways/highways! the jerking occurs on a regular basis and at various speeds on various highways...

- Seymour, TN, USA

It has a problem with cycling of the thermostat that causes stress fractures on the radiator leading to coolant leaks. Attached are GM bulletins on the 2014 and 2015 models. As one can see they have provided special coverage. My radiator is leaking just like the service bulletin says. This needs to be recall.

- St. Cloud, MN, USA

The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving approximately 35-50 mph, the contact noticed a minor shaking coming from the vehicle. The contact took the vehicle to love Buick GMC (736 Saturn pkwy, columbia, SC 29212; (803) 732-6500) who flushed and refilled the transmission fluid however, the failure recurred. The contact returned the vehicle to the same dealer who performed another transmission flush however, the failure persisted. The contact stated that the vehicle drove rough and that the check engine warning light illuminated. The contact used a dtc scanner and retrieved a code related to the transmission control module and temperature sensor. The vehicle was then taken stokes trainor Chevrolet Cadillac Buick GMC (2004 wilson rd, newberry, SC 29108; (803) 792-4763) and the contact was informed that the internal wiring harness needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the issue and informed the contact that the VIN was included in a special coverage program. The approximate failure mileage was 75,000.

- New Berrry, SC, USA

When I was driving my truck off the highway onto the main road where I was going I noticed there was an issue with my truck. After coming to a stop at a red light once it turned I accelerated and suddenly felt a jerk from the truck and heard a loud whistling noise. It did this multiple times about 5-6 time every time I would accelerate from a speed of 30-40. I decided to drop it off at my local GMC to get it looked at. They called me the next day to pick it up since they ran it through diagnostics and didn't find an issue with the vehicle. Once I got there I demanded for the mechanic to come drive the truck with me to see what the issue was and they decided they needed to keep it for a couple of days to get it looked at. They then called two days after and said that the transmission was messed up and needed a new one totaling the cost to $5346.07 which is certainly not something we can afford right now! I don't understand how they didn't see the issue the first time they diagnosed it?? this is something that needs to get recalled I have seen many similar issues.

- Foley, AL, USA

The vehicle is stalling when braking and getting ready to turn. My truck is showing stabilitrak service intermittently and I've almost been in a crash 3 times because of this. The vehicle only restarts after placing in park. This is not safe when in traffic. There seems to be no recalls and no known cause. Someone is going to die if GM doesn't fix this. I've been on forums and it's a common problem. It should be fixed by GM if it is so common. This happens when approaching cross traffic at an intersection and I lose all control of steering braking and power to the truck.

- Gillette, WY, USA

The contact owns a 2015 GMC Sierra 1500. The contact stated that the radiator tube failed and allowed radiator fluid to leak. The vehicle was taken to broadway Chevrolet automotive (2700 ashland avenue, green bay, wi 53404, (920) 498-666), to be inspected. The mechanic replaced the radiator and thermostat. The vehicle was repaired. The manufacturer was notified of the failure. The contact was informed that the vehicle was no longer under warranty. The failure mileage was 78,000. The VIN was invalid.

- Green Bay, WI, USA

The contact owns a 2015 GMC Sierra 1500. While driving and turning into a shopping center, the entire vehicle shut off, including the engine, electrical system, and instrument panel. The steering wheel also seized along with the windows. When the contact stopped and restarted the vehicle, the control panel and odometer display delayed to show the correct reading and the clock had to be reset. The display instructed the contact to roll the window down and back up. The contact had to wait several minutes to get power to restart the vehicle. The failure had occurred three times every three months. The contact was able to restart the vehicle and drive home. The vehicle was taken to regal GMC (2615 lakeland hills blvd, bldg 3, lakeland, fl 33805, (863) 262-4222) for a recall repair. The dealer was unable to locate any failure codes. The contact was informed to schedule another appointment. The manufacturer assigned a case number to the contact and stated that an urgent senior representative would call the contact back. The failure mileage was 25,000. The VIN was unknown.

- Lakeland, FL, USA

Brakes wouldn't stop

- Fountain Inn, SC, USA

The contact owns a 2015 GMC Sierra. While driving low speeds, the vehicle violently vibrated and made an abnormal noise. Also, the stabilitrak and check engine indicators illuminated. The contact mentioned that the check engine indicator periodically illuminated and flashed. Also, while driving, extra force was needed to depress the brake pedal and stop the vehicle. The vehicle was taken to boulevard Buick GMC (2800 cherry ave, signal hill, ca 90755, (562) 492-1000) where the contact was informed that the vehicle misfired and the entire engine needed to be diagnosed. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 59,000.

- San Pedro, CA, USA

The contact owns a 2015 GMC Sierra 1500. While driving 70 mph, the vehicle lost power and turned off. Also, "lower driver window" appeared on the instrument panel. The contact was able to restart the vehicle and continue driving. The failure occurred seven additional times. The vehicle was taken to smail Buick GMC Cadillac (located at 5116 us-30, greensburg, pa 15601, (724) 798-0320) to be diagnosed, but they were unable to duplicate the failure. The vehicle was not repaired. The manufacturer was notified. The failure mileage was 53,000.

- Greensburg, PA, USA