2015 GMC Denali Exterior lighting Problems
- Complaints
- 6about this part
- Share
- 33%of 18 total for the year
- Median mileage
- 50,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the exterior lighting of the 2015 GMC Denali, 33% of the 18 complaints for this model year. Where a mileage was given, the median is 50,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“We bought our 2015 Denali 1 year ago and have approx 50,000 miles and the passengers side tail light is out. After researching taillight problems for my make and model this seems to be a very common issue. This should be considered as a recall but when looked into, I see it is not. Its a shame to spend so much money on a vehicle to have the tail light out at 3 years (after factory warranty is already out) and you have to replace the whole tail light instead of one piece.”
NHTSA complaint #11172670, filed 2019-01, 50,000 miles“Rear taillights have moisture in them. The moisture is constant in one and intermittent in the other. Both have been replaced once by dealer 3 months ago. Problem still exists”
NHTSA complaint #10978631, filed 2017-04, 48,000 miles“Both back brake light work inconsistantly. While moving and at a complete stop. Local dealership charges at min 1200 per light to fix. Seems to be a common problem with the Denali's.”
NHTSA complaint #11207084, filed 2019-05Related service bulletins
- 10236041May 3, 2023This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines.
- 10232136Feb 15, 2023This service bulletin provides information for dealers/technicians on Exterior Lamp Condensation and Water Leaks and Replacement Guidelines.
Exterior lighting: other model years
Other parts of the 2015 GMC Denali
5 complaintsElectrical system
4 complaintsBrakes
2 complaintsSteering
2 complaintsElectronic stability control
1 complaintsEngine
1 complaintsFuel system
1 complaintsOther or unknown
1 complaintsBody and structure
1 complaintsSuspension
1 complaintsVehicle speed control
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2015 GMC Denali
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology