The rear tail light sporadically quits working. There appears to be a short or malfunction in the led light structure. This occurs when stopped and in motion. Malfunctioning break lights are a serious safety concern.

- Olympia, WA, USA

Circuit boards in led tail lights failing. This results in sporadic functioning brake lights. The design of the bus bar in the tail light has resulted in creating weak spots in the bus bar that crack and unless replaced or repaired at substantial cost the brake lights may or may not function properly.

- Uvalda, GA, USA

Taillight is out on my vehicle. The lights are led and the car is only four years old. Replacement is $500-750 for a taillight!

- Escalon, CA, USA

Driver side break light works intermittently. After researching multiple owners in similar model years have noted the issue being inside of the light itself having an electrical issue. But the dealership wants $750 for a new one when the problem is wide spread, needs to be recalled and made right.

- Forest City, NC, USA

My brake lights on my 2015 Yukon dinali went out on the right side. I was informed by the dealership that they are not responsible for this and none of my warranties will cover it.

- Scottsdale, AZ, USA

Passenger side rear brake light suddenly stopped working. It is an led light which should never have to be replaced. Our local GMC service department said that it is the 'driver' attached to the led bulb that is faulty, but it cannot simply be replaced. They have to reinstall an entire tail light which apparently is pretty costly. I was quoted $925. Again, nothing wrong with the light bulb itself. Shouldn't cost $925 to fix.

- Belleville, IL, USA

Driver's side brake light not working. Apparently a common problem in these year Yukon, and GMC refuses to acknowledge the problem. Repair is exorbitantly expensive, and GMC should pay for the repairs. The vehicle only has 50,000 miles, and has never been in an accident.

- Glendale, CA, USA

Both brake lights are out. It's because of a defect in design. The metal bracket that holds the brake light leds is cracked and breaks the circuit, therefore the lights won't work. Led lights should work for quite a long time. Only way to fix it through the dealer is to replace the entire tail light assembly to the tune of approximately $1400 for both lights. It can be repaired by cutting the assembly open and soldering the crack in the led bracket. There are many instances of this being reported online. Dealers deny encountering the problem. GMC is not addressing the issue. There are reported cases online where GMC Yukon owners have of course had the repairs made within warranty with no cost but as soon as the warranty is out and the problem reoccurs, then the owner has to pay approximately $700 per light to replace the tail light assembly. This is a safety issue, no brake lights can cause serious wrecks and injury.

- Zachary, LA, USA

Both led tail light units on 2015 GMC Yukon failed within 6 months of each other. The led stripping no longer illuminates. Exact same problem on both driver and passenger sides of vehicle. Was informed by dealership the only option for repair is replacement of the entire light at a cost of over $900 per tail light.

- Kirkland, WA, USA

Brake lights wont work all of the time.

- Roseville, CA, USA

Over the life of owing this new car, from March 2016 to July 2019, the rear passenger and driver side tail light assembly have each failed once and were replaced by my own expense. Again for a third time total, this month the passenger side taillight assembly repeated its failure to have the break light to function. I feel this amount of part failure inside 3 years is too extreme and is due to poor design by the manufacturer. These failed parts happened at 16,000, 30,000 and 50,000 miles of vehicle use. None of the taillight parts were ever physically damaged before. The cost of the part alone is $795. That is even more rediculous considering a home led bulb lasts longer and costs much less.

- El Paso, TX, USA

Left tail light is intermittently faulty. Brake light only works intermittently.

- Austin, TX, USA

Rear led taillights work intermittently. Found several forums where this happens to a lot of people. If you tap the taillight it sometimes begins working again. Truck only has 60K miles and GM wants over $1200 to fix (replace both taillights). Evidently there's a circuit board that goes bad inside. I had this at GM to be fixed but because taillights were working at the time, they found no problem.

- Warm Springs, GA, USA

Rear tail/brake light failed after functioning intermittently for a month. GMC dealer replaced the entire assembly with a new GM part at a cost of over $800. GMC dealer explained that despite chronic failures of this particular part, GM refuses to recall. Failure appears to result from a faulty circuit board that cannot be replaced or repaired easily. Intermittent nature of the failure is an unsafe condition, especially at night or in foul weather.

- Dunnellon, FL, USA

Rear brake light assembly failing to light when brakes applied and there is not a notification to the driver. This is a manufacture flaw with the led light circuit inside the assembly. There is not a light out notification so the driver is not aware the brake light has failed. This is a safety issue and is an well known issue on the 2015-2019 Yukon. This is occurring often and GMC is having problems with supplying replacements because the demand is so high from the failure. GMC has also raised the price of the brake light by 30% from $425 to $675 not including labor. I called the dealer and they informed it was a high failing item and was on backorder and not sure when they would get one. Driving the vehicle without proper brake lights is a safety concern and not legal so left with little option but to stop driving the Yukon.

- Grapevine, TX, USA

Purchased vehicle (used) from dealer less than 2 years ago. Driver taillight went out. Not covered under warranty but is a safety issue that according to several forums in a known problem. The taillight is architected, engineered, and built in such a way as to be very expensive to replace, break often, and discourage diy or non-dealer repairs. The vehicle was stationary when the problem was noticed.

- San Marcos, CA, USA

Someone who was driving behind me told me my driver's side brake light was out. I checked it with the help of someone else a couple times afterwards and it worked. Then a week or so later a co-worker told me the same thing, that it was out. I checked it again later and it worked, so the problem was intermittent. When I took it to the dealer, the taillight assembly had to be replaced. I just purchased the vehicle 1/7/2019 and before it was offered for sale the passenger-side tail light assembly was also replaced.

- Charlotte, NC, USA

The contact owns a 2015 GMC Yukon. The contact stated that the rear driver's side brake light and passenger side tail light were burned out. The contact stated that the brake lights would not illuminate. The vehicle was taken to ed bozarth Chevrolet (2001 S havana St, Aurora, co 80014, (720) 746-2716) and john elway Chevrolet (5200 S broadway, englewood, co 80113, (720) 259-0391), but the parts were not available. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and provided a case number. The failure mileage was 81,000.

- Aurora, CO, USA

2015 GMC Yukon denali rear tail lights fail due to defected parts. GMC will not replace the failed parts which is a know safety issue. Numerous complaints online with the GMC Yukon 2015-2019 models.

- Las Vegas , NV, USA

Tail light malfunction intermittently. The tail lights and brake lights occasionally will go out and come back on randomly. GMC knows about the issue and replacements cost about $750 per unit which even these replacements have been known to fail within a year. The fact that this happens randomly and so intermittently this becomes a safety issue. I've had it in the shop and they said nothing was wrong because they were both working. I get home and they are not. Is there a way to have GMC replace these via a safety recall?

- Palm Beach Gardens, FL, USA