2015 Gmc Denali problems, complaints & recalls
Most-reported problem areas: Exterior Lighting (5) · Power Train (4) · Steering (2)
🧭 Reliability snapshot
Compared against other Gmc 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 (115)
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.
Structure 2023-06-30 · 99-08-51-001F · Service Bulletin/Repair Instructions
this service bulletin provides information on paintless dent repair process.
Engine And Engine Cooling 2023-06-30 · 01-06-01-011N · Service Bulletin/Repair Instructions
this service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
Power Train 2023-06-29 · 17-NA-066 · Service Bulletin/Repair Instructions
this service bulletin provides information for automatic transmission oil cooler flush and flow test.
Electrical System 2023-06-29 · 13-08-116-001I · Service Bulletin/Repair Instructions
the intent of this service bulletin is to identify aftermarket aldl or dlc interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
Equipment 2023-06-14 · 16-NA-158 · Service Bulletin/Repair Instructions
this service bulletin describes the u.s. dealer special tool loan program process.
Equipment:other:owners/Service/Other Manual 2023-06-08 · 23-NA-103 · Service Bulletin/Repair Instructions
this service bulletin provides information on submitting quality photos of various vehicle concerns to the gm technical assistance center (tac).
Showing the 6 most recent of 115 bulletins. Search all of them free at nhtsa.gov.
What owners report
2021-02-19 · Power Train · 148,000 mi“tl* the contact owns a 2015 gmc denali. the contact stated while driving 35 mph, the vehicle downshifted and was unable to upshift into the higher gears. the contact stated no warning light was illuminated. the contact called the local dealer sterling buick gmc (5853 frontage rd. i 49 south, opelousas, la 70570, (337) 942-3516) and made the dealer …”
2020-12-08 · Power Train · 118 mi“vehicle seems to be stuck in 4wd, unable to switch out of it. cannot turn vehicle.…”
2020-10-19 · Service Brakes · 73,000 mi · 💥 crash“tl* the contact owned a 2015 gmc denali. the contact stated that while their husband was driving approximately 45 mph, when the traffic came to a sudden stop causing the contact to apply the brakes to the vehicle. the driver had to depress the braking pedal excessively, however, the brakes did not stop and the brakes were floored. the vehicle ended…”
2020-08-29 · Steering · 64,000 mi“this has happened several time in the city crossing an intersection usually at slow speed braking and turning and all the sudden i lose everything. no steering electrical and braking. the park assist will sometimes start going off like crazy just before it happens, but not all the time. put in park and open the door it comes back on. then says roll…”
2020-07-12 · Power Train · 30,000 mi“my truck has 30,000 miles and has the 'chevy shudder'. why is this not a recall? gmc wants me to pay out of pocket for the transmission flush. when i am driving the truck it begins shuddering and shaking through certain shift points.…”
2020-05-05 · Structure:body · 71,000 mi“rear defroster started emitting smoke, overheated and cracked rear windshield. please see existing recall n192220470. although vehicle not located in canada, can assure you this is happening in united states as well. *tr…”
2020-03-28 · Unknown Or Other · 62,000 mi“have had my vehicle at the shop for transmission issues several times. two of the times, issues were duplicated and parts replaced, but same issues continue as soon as i get it back. my complaint when i take it in is always the same. normally when i accelerate from a dead stop forward or reverse, the transmission makes a thumping noise. it has stea…”
2020-02-18 · Steering · 72,000 mi“intermittent power steering failure turning at low speeds. almost hit a car while turning in a road due to lack of power steering working properly.…”
2020-02-14 · Fuel/Propulsion System · 130,000 mi“under normal driving conditions, my cp4 fuel injection system blew up. i had to have it towed to the nearest diesel repair shop, $14.000 later , i was back up and running…”
2019-12-20 · Vehicle Speed Control · 39,000 mi“while thankfully driving in the slow lane on the interstate in st. louis my stability light came on the truck then slowed down on its own then went into four-wheel-drive then revved up to 6000 rpms then every service light came on on the dash when pulling to the side of the road the car then would not drive forward it stayed in neutral regardless …”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.