2015 Gmc Sierra Denali problems, complaints & recalls
Most-reported problem areas: Service Brakes (7) · Power Train (5) · Structure:body:roof And Pillars (1)
🧭 Reliability snapshot
Compared against other Gmc Sierra Denali model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (1,814)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-09-26 · PIT5698F · Service Bulletin/Repair Instructions
this pi provides diagnostics tips on how the lin bus works and how to diagnosis it.
Unknown Or Other 2026-09-04 · PIP4902W · Service Bulletin/Repair Instructions
this preliminary information advises a dealer on how to email gds2 session logs into technical assistance.
Unknown Or Other 2026-07-21 · PIT5099J · Service Bulletin/Repair Instructions
pi to help diagnose a/c concern
Unknown Or Other 2026-04-01 · PIT3271Q · Service Bulletin/Repair Instructions
this preliminary information communicates information about how to determine if a wheel and tires size change is available.
Unknown Or Other 2026-03-09 · PIP6104 · Service Bulletin/Repair Instructions
this preliminary information communicates the steps on how to save a gds2 session log and upload to a technical assistance case in cx connect.
Unknown Or Other 2026-03-09 · PIP4902V · Service Bulletin/Repair Instructions
this preliminary information advises a dealer on how to email gds2 session logs into technical assistance.
Showing the 6 most recent of 1,814 bulletins. Search all of them free at nhtsa.gov.
What owners report
2025-12-01 · Fuel System, Diesel · 160,000 mi“the contact owns a 2015 gmc sierra 2500 denali. the contact stated that while driving at 65 mph, the vehicle lost motive power with the “engine power failure” warning light illuminated. the vehicle was towed to the residence. the vehicle was later towed to an independent mechanic, where it was diagnosed and determined that the fuel system had faile…”
2025-05-22 · Engine And Engine Cooling“see attached document for complaint. …”
2024-03-08 · Power Train“the contact owns a 2015 gmc sierra 1500 denali. the contact stated that while shifting the vehicle from park(p) to drive(d), the vehicle hesitated and then jerked into gear. the contact stated that the entire vehicle was shaking when it jerked into gear. the contact stated that the failure was also occurred while shifting the vehicle into reverse(r…”
2020-12-30 · Service Brakes · 30,000 mi“4 months ago the display portrayed a message stating, trailer brake warning, have system checked. since that time i have attempted on numerous to have my vehicle checked. but as of this date i have not been to have any dealership look at my vehicle. i have been told by dealership that the vehicle computer shows a history but no current error cod…”
2020-08-18 · Unknown Or Other · 57,000 mi“ac blows hot air qont gold freon for longer then week and half and is back to hot air..lead to believe its the ac condenser has failed…”
2020-02-09 · Service Brakes · 39,500 mi“i was backing up at very low speed the brake pedal got very hard and the vehicle acted like it did not want to stop i had to keep pushing extremely hard on to the break to get the vehicle to stop i tried it again in drive and the vehicle did this exact same thing this time i noticed after paying particular attention that the brakes while they were …”
2019-12-05 · Power Train · 3,977 mi“transmission is not able to be fixed. three repairs and gm can't fix. transmission jerks, slips, clunks. uncomforable to drive. i am stuck with subpar vehicle. gm has been horrible to work with. 17 recalls? why cant gm make a solid reliable vehicle after 100 years in business?…”
2019-02-26 · Service Brakes · 49,000 mi“hard brake pedal with increased effort needed to depress the brake pedal. feels like truck will not stop. had to have truck towed. reported back on 11-24-18 to nhtsa: ( #1115347). brake vacuum pump was replaced @ gm dealer on 11-14-18, same situation happened again on 02-19-19. gm tsb # pit5361d needs to be a recall.…”
2019-02-17 · Power Train · 55,000 mi“when coming to a stop, applying a steady amount of brake pressure the transmission shifts and loses all forms of engine braking causing the truck to speed up and overshoots the stopsign.…”
2019-01-07 · Service Brakes · 77,000 mi“poor brake performance. the brake pedal gets stiff at a low speed and causes the truck to not brake completely…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.