Rear tail/brake/turn lights randomly don't work. This issue is very common and complained about repeatedly on the internet. I have this issue with my left tail light.

- Hayden, ID, USA

Approximately 6 months after purchasing our 2015 GMC Yukon denali, having only driven under normal driving conditions on highways and surface streets for 15K miles, the passenger side tail / brake light went out. It was taken in for warranty and replaced by the dealer. Approx 6 months later the driver's side tail / brake light did the same thing, and was also replaced by the dealership. Now approximately one year later the rear passenger light is out again and dealer wants $600 to replace the faulty brake light lamp, but can't because they're in such demand based on the defective part, that they are backordered. A quick internet search indicates thousands of people having the same issues.

- Bermuda Dunes, CA, USA

Tail lights only work intermittently

- Jenks, OK, USA

Rear brake lights stop working intermittently, sometimes one doesn't work, sometimes both are out, sometimes both work. Seems worse in the hot weather. Taken it in multiple time, 1st 2 times couldn't duplicate the outage, 3rd time they said it needed both taillight assemblies replaces for $1200. Then they worked all winter, now not working consistently.

- Alexandria, VA, USA

Driver side rear taillight not working, was told it was a broken solid circuit by the dealership. They want close to $1000 to replace the entire assembly. This is a very well known problem that GM is not recalling!!!!

- Tampa, FL, USA

The rear brake lights have issues one side stopped working a few weeks ago and now the other side stopped working they are not cheap to repair and the car is not even got 40,000 miles on it I would expect that they would at least last about 80,000 miles.

- Roselle, IL, USA

Left taillight went out at around 82,000 miles, first flickered for a few months, then went completely out. Within one week, the right taillight went completely out also.

- Olney, MD, USA

Both brake lights work intermittently. If you tap hard on it they sometimes come back on but don't stay on. I took to GMC dealer where they informed me they've had a dozen Yukon's in recently with the same issue. Dealer indicated issue is faulty circuit board that overheats causing the lights to short out. I'm out of manufacturers warranty. Extended warranty does not cover lights. Dealer charges $800 per light (part only).

- Mesa, AZ, USA

Driver side rear brake light stopped working. Dealer wants $800 to replace brake light

- Franklin Park, IL, USA

Defective tail light assembly. Inadequate material/design defect leads to circuit connection failure. GM is aware of the problem but still charges $800-900 to repair the oem defect. Major safety issue having tail light failure. We have many Yukon in our fleet and all have had failures.

- Los Gatos, CA, USA

Taillight assemblies keep failing. Dealer replaced one under warranty, but other now failed and charging $800+ to fix. Defect in design/manufacturing of critical safety component. It's a common and known defect in the part. Our other Yukon's have the same issues.

- Los Gatos, CA, USA

Taillight failure. GM is aware of the problem, it's all over the internet. Now out of warranty and dealer wants $800+ each to fix.

- Los Gatos, CA, USA

My passenger side brake light went out a few months ago. Turn signal works. Now my driver side brake light is out. Turn signal does work. To get both fixed, I have to have the entire unit replaced which is quite expensive. I already replaced the front passenger unit due to the running light going out 2 years ago. Brake lights, are necessary for safety which is a problem. These led lights are supposed to have a longer functionality. And they cannot be replaced easily or cost-effectively.

- Hot Springs, AR, USA

Rear tail light went out and the only solution is to replace the tail light? this is nutts

- Portland, OR, USA

Passenger brake light does not work. We have had problems with it since day one. We took it back several times but still doesn't work.

- Las Vegas, NM, USA

Brakes don't work well when traveling at low rates of speed. Stopping requires brakes to be pressed to the ground and still may not stop. I have almost had several accidents even after having the issue 'repaired' last year. I've had the problem assessed at 3 different mechanics. I have had to throw my car into park to avoid hitting cars in front of me. Brakes fail while driving in places such as traffic jams, drive thru, school pick up, etc. This is a huge safety hazard and fear that my children may be hurt if this issue is not corrected by the manufacturer. Steering becomes nearly impossible when the brake issues occur. This is an ongoing problem for the last 1.5- 2 years. Also, the tail lights continue to go out even after paying hundreds of dollars for replacements.

- Lufkin, TX, USA

Passenger side brake light out. I see there are over 100 complaints, and no recall. Come on GMC, this is a serious safety hazard.

- Rockville Centre, NY, USA

Replaced passenger tail light due to led failure in 2017. Driver's side failed this week. Full replacement of housing is required, and nothing that I can find states any design improvements have been made to date. This means further replacements of the entire light (part alone is quoted at around $700) will be necessary throughout the life of the vehicle. It appears from a quick internet search that there are a large number of vehicles effected, yet the dealer claims there is not a design issue and no recall has been issued. Given this failure makes the tail light inoperable as well as the brake lights, this is a serious safety issue.

- Washington, MO, USA

Part of the circuit board in the tail lights was very poorly designed. It is a sealed assembly without serviceable parts. A very thin strip of metal, one at the top, and one at the bottom break due to thermal expansion and contraction. It gives no warning no lights nothing just all the sudden no tail or brake light. It's not right it isn't serviceable, and the dealership charges $400 plus for a new one. What happens if both fail at the same time. G.M. needs to be held liable, and do the right thing. After all they are supposed to be "professional grade".

- Longview, TX, USA

Driver side brake light stopped working on 2015 Yukon w 65K miles and no accidents. Dealer said it's a known issue and part is $800 to repair due to led assembly. GMC customer service offered a $100 voucher to go towards new part (if I took my car in and paid for a diagnostic test) which is a joke. As of today there are 278 complaints regarding 2015 Yukon and 60% of those are regarding exterior lighting. However GMC customer service would not admit faulty tail lights were a "known issue." Why isn't this a recall"! and why are consumers still be charged $800 for faulty tail light assemblies" GMC is profiting off of known wide-spread issues and needs to be held accountable. The brake light is on backorder due to the sheer number of others experiencing this same issue. My car has had shocks replaced at 15K miles, electrical issues with interior lights, ac problems, and now this all before 70K. Come on GMC....step it up or else I'll be trading my pos Yukon in for a Chevy.

- Mount Pleasant, SC, USA