2018 Gmc Sierra Denali problems, complaints & recalls
Most-reported problem areas: Steering (3) · Structure:body (2) · Power Train (2)
🧭 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 (948)
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 948 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-04-02 · Power Train · 87,000 mi“the contact owns a 2018 gmc sierra denali 1500. the contact stated that on several occasions while driving at speeds over 30 mph, the vehicle started shaking abnormally. the contact stated that the vehicle stalled while driving on three separate occasions and stalled twice while slowing down. there was no warning light illuminated. the vehicle was …”
2026-03-11 · Structure · 107,000 mi“the contact owns a 2018 gmc sierra 1500 denali. the contact stated that while driving at an undisclosed speed, and while the vehicle was parked, the running boards unexpectedly lowered. additionally, there was oil leaking from the vehicle, and the check engine warning light was illuminated. the vehicle was taken to the dealer, where it was diagnose…”
2023-06-29 · Structure:body · 35,000 mi“the contact owns a 2018 gmc sierra 1500 denali. the contact stated while exiting a parking lot, the passenger’s side running board detached from the vehicle causing minor damages to the passenger’s side of the vehicle. there was no warning light illuminated. the dealer was contacted but provided no assistance and advised the contact that the runnin…”
2021-04-14 · Service Brakes · 73,890 mi“certain 2018 gmc sierra 1500 denalis were issued a recall for the "electronic brake control module". for my vin, it doesn't show that that issue needs to be fixed (i just purchased this truck last week), but it indeed does. when coasting at a low speed on a small hill, brakes almost feel non existent. gmc recalled many of their vehicles to get this…”
2021-04-05 · Structure:body · 61,000 mi“hood vent fell off while driving normal speeds on the highway and hit the car behind me. i feel that the cheap plastic is defective and could cause a problem with the part going airborne at high speeds and hitting other cars.…”
2020-12-28 · Power Train“driving down the highway about 65mph it made a loud clunk and i took it in to service department and they told me i would have to pay about $400.00 to drain the transmission fluid and replace it. i told them m pick up only has less than 15,000 miles on it i don't think this is fair, the service gu said the don't pay for it and other gmc denali cu…”
2020-10-26 · Steering · 14,700 mi“on the morning of oct 26, 2020 @ 845am... i was heading south on 287 in mansfield tx. it was raining hard so i was only going 60 mph. the car in front of me was going 55 or so. when the rain and wind picked up, the car in front of me abruptly hit its brakes. that's when my truck brakes locked and i began sliding or being pulled to the right. i was …”
2020-10-26 · Steering · 14,700 mi“i nearly died when my brakes failed on my 2018 gmc denali this morning. i was only going 60 mph when another driver cut in front of me, and hit their brakes but when i tried to stop, i could not! i then began swerving from lane to lane because it was raining. thank god i didn't die and that the person on the right slowed down and moved out the way.…”
2020-07-06 · Steering · 47,000 mi“while driving highway speed (75mph) the steering went out as i was trying to go thru a curve., i had to use both hands and force the wheel to turn to exit highway. luckily it was only a slight turn i was trying to navigate! it threw service code'c0475, they say it's the steering gear! $2700 fix i believe it's electronic error.…”
2020-06-21 · Wheels · 26,000 mi“while getting my truck inspected the shop owner told me about a bulge on right front tire. he asked me if they sold that to me like that i proceeded to tell him yes. he said it should be reported so that is what i'm doing. i'm not sure if this is covered. i considered it a safety when vehicle was purchased in tennessee and going to upstate ny, and …”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.