2018 GMC Sierra Denali problems
The 2018 GMC Sierra Denali has 26 complaints on file with NHTSA. The largest share (19%) concerns engine. Next are brakes (15%) and body & structure (15%).
At a glance
- Complaints
- 26 filed with NHTSA
- Most reported
- Engine 19% of complaints
- Crashes and fires
- 0 and 0
- Injuries and deaths
- 3 and 0
- Typical mileage
- 26,000 miles 19 complaints with mileage
Source: NHTSA owner complaints
Where the complaints are
Share of this model year's complaints by the part of the car involved. One complaint can name more than one part, so the shares can add up to more than 100%.
When problems show up
View the numbers
| Mileage | Complaints |
|---|---|
| 0k to 20k miles | 9 |
| 20k to 40k miles | 4 |
| 40k to 60k miles | 1 |
| 60k to 80k miles | 2 |
| 80k to 100k miles | 1 |
| 100k to 120k miles | 2 |
| 120k to 140k miles | 0 |
| 140k to 160k miles | 0 |
| 160k to 180k miles | 0 |
| 180k to 200k miles | 0 |
| 200k+ miles | 0 |
What the data shows
Of the 19 complaints that include odometer readings, half describe a problem before roughly 26,000 miles.
Safety-related details: 3 injuries reported.
Looking only at complaints filed within five years of the model year (so older and newer years are comparable), the 2018 ranks 3rd most-complained-about out of 4 model years of the GMC Sierra Denali with enough data (23 complaints in that window).
What owners wrote
A few complaints as filed, shortened and with personal details removed. The first ones are among the most serious reports for this model year; the rest are typical.
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. The truck seemed to be pulling me to the right. Why I have no idea. But why is GM putting people lives at risk like this?
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.
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 running board needed to be replaced. The vehicle was not repaired. The manufacturer was contacted but provided no assistance. The failure mileage was 35,000.