Driver side rear brake light working intermittently, approx. 10% of the time. Called dealership and said it is known issue with most denali brake lights. Was quoted to replace entire assembly $900. Each side for this known safety issue. This is a serious safety issue and known by GMC with no recalls available.
2015 GMC Yukon lighting problems
moderate 229 complaints filed with NHTSA · avg repair $250 · see lighting across all vehicles →
Failure mileage
Complaints
229
Recalls
0
Avg fix
$250
When does it fail?
Of the 229 lighting complaints filed for the 2015 GMC Yukon, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 5 model years of GMC Yukon we track for lighting problems, this one carries the most owner complaints on file — 229.
Lighting accounts for 43% of every owner complaint on file for this vehicle — the dominant problem area across 11 categories tracked.
The failure pattern owners describe
Buyer takeaway: Rear tail and brake lights on 2015 GMC Yukons fail frequently and unexpectedly at various mileages, creating a serious safety risk since failures occur without warning. Replacement costs run $600–$1,000+ per light, parts are backordered due to high demand, and GM's recall has mileage/age limits that exclude many owners.
Rear tail and brake lights on 2015 GMC Yukons fail intermittently or stop working altogether, often without any dashboard warning. Owners describe lights that work one moment and don't the next, stop working more in summer heat than winter cold, or only function when the assembly is tapped. Failures happen while driving and parked. Both driver and passenger sides fail, sometimes within days of each other. Mileages range from 16,000 to 81,000 miles.
Dealerships uniformly confirm this is a "known issue" and "common problem," replacing multiple units per week according to service advisors, yet GM corporate won't formally acknowledge widespread defect knowledge. Repair costs run $600–$1,000+ per light assembly, parts are heavily backordered, and the entire sealed unit must be replaced—you cannot replace just the bulb. Owners report internal circuit board metal connections crack under thermal stress, breaking the circuit. Some third-party shops repair the crack by soldering for less cost.
GM issued a Technical Service Bulletin around May 2014 and updated it in March 2016 to cover 2016–2017 models. A recall exists for intermittent brake light function but only covers vehicles under 72,000 miles or 6 years from service. Many owners exceed these limits and are denied coverage. Extended warranties typically exclude tail light failures. Dealerships request return of faulty lights, suggesting GM investigates defects, yet offer no broader fix or reimbursement.
Same GMC Yukon lighting reports on nearby years: 2016 · 2017
Failure modes owners describe
Rear tail/brake light intermittent operation or complete failure
Rear tail lights and brake lights fail intermittently or stop working entirely, often without warning. Failures occur while driving and stationary. Some lights flicker, work sporadically based on temperature or time of day (more in summer than winter), or work momentarily when tapped. Both driver and passenger sides affected, sometimes both failing within days of each other.
When: Across all mileages; owners report failures from 16,000 to 81,000 miles. Many failures occur while still under or shortly after factory/extended warranty expiration.
Symptoms owners cite: Rear brake lights non-functional; Rear tail lights non-functional; Lights intermittent, flickering; Lights work only when cold outside; Lights work only at night or in darkness; Lights come on momentarily when assembly is tapped; Both rear lights fail within short time frame; No dashboard warning indicator; Lights cycling on and off while driving
Repairs/costs cited: Dealerships charge $600–$1,000+ per light assembly. Parts are backordered due to high failure volume. Entire sealed light assembly must be replaced; individual bulbs cannot be serviced. Some owners report third-party repair shops repair by soldering internal circuit board cracks for less cost. Owner reports indicate internal circuit board cracks at metal connection points.
Recalls/TSBs owners mention: GM issued a Technical Service Bulletin (TSB) circa May 2014, updated March 2016 to include 2016 and 2017 models. GM recall issued for intermittent brake light function, but limited to vehicles under 72,000 miles or 6 years from service date. Many owners with higher mileage denied coverage. Extended warranties often do not cover tail light failures. Dealership service advisors confirm issue is 'known,' 'common,' and 'recurring,' but GM corporate denies widespread knowledge or offers minimal assistance ($100 voucher cited in one complaint). Parts department requests return of faulty lights, suggesting known defect investigation.
Headlight condensation and LED failure
Passenger and driver side headlight assemblies fill with internal condensation, causing bulb filaments to burn out prematurely. Turn signal indicators stop working. Sealed assemblies prevent individual bulb replacement; entire headlight assembly must be replaced. Condensation covers entire lens, reducing visibility.
When: Reported from 37,000 to 66,000 miles. One owner reported condensation at approximately 50,000 miles within ~2 years of purchase.
Symptoms owners cite: Condensation visible inside sealed headlight assembly; Turn signal/indicator stops working; Turn signal works intermittently after condensation appears; Reduced headlight brightness; Poor visibility at night; Corrosion suspected inside assembly due to moisture
Repairs/costs cited: Complete headlight assembly replacement required at $1,200–$1,462 per side (labor and parts). Bulb itself is non-serviceable within sealed assembly. Owner reports dealership noted corrosion inside, predicting failure of opposite side soon after.
Recalls/TSBs owners mention: GM issued Technical Service Bulletin circa May 2014, updated March 2016 covering 2015–2017 models. TSB notes that 'replacement of the lamp assembly may not correct this condition.' Extended warranty does not cover condensation-related failures; one owner cited being $600 miles short of warranty expiration.
Front LED strip failure in headlight
Front driver side LED strip in headlight assembly stops working or fails prematurely. LED lights are advertised as lasting 5+ times longer than incandescent bulbs.
When: Reported on vehicle approximately 3 years old with under 50,000 miles.
Symptoms owners cite: Front driver side LED strip non-functional; LED failure despite long-life marketing claims
Repairs/costs cited: LED strip replacement quoted at $1,900 (combined with rear panel repair). Extended warranty ($2,000) does not cover LED strip failure.
Synthesized from 229 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
Passenger side tail light stops working occasionally. This affect's the brake light and night driving. It has stopped working up to a week at a time, but then starts working again. It might be weather related.
Tail lights work inconsistently, dealership tells me it's common problem with my year and model.
We were stopped at a red light today by someone telling us our tail light was blinking and going out. Our vehicle only has 65000 miles! I would think a LED light should not go out yet. My vehicle sits under a carport when not in use. I have seen numerous complaints online for this same problem for same year model
Both tail lights fail. I just bought this vehicle at Ewald Automotive in Oconmowoc Wi a month ago with 100k and I know they were aware of the problem and so is GMC. I am not paying 900 bucks for each tail light. They are absolute junk. The left side someone already messed with it because there is electrical tape on it. Ewald laughed in my face.
Left rear tail light quit working, I was able to break the cover off and soldered the LED mounting strip,. Right side quit working so I broke the cover off but this time it was severely damaged. Soldered it. Left side quit working again so I replaced both sides with aftermarket units. Date below is just to fill the space. It was after warranty expired and over about 6 months time.
Had lighting trouble with your 2015 GMC Yukon?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the lighting problem on the 2015 GMC Yukon?
It's a documented issue but not catastrophic. 229 complaints have been filed. Repairs average $250 and most owners catch it before it causes a breakdown.
At what mileage does the lighting typically fail?
Across the 162 complaints that reported odometer mileage, most lighting failures cluster between 45,000 and 79,800 miles, with the median around 57,000. A quarter of owners report trouble before 45,000; a quarter make it past 79,800. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $250 for lighting repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to lighting?
No active recalls currently cover lighting issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2015/GMC/Yukon.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.