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2015–2025 GMC Sierra Denali FAQ
How do I start the vehicle when the remote key battery is low?
2025
Place the remote key in the transmitter pocket or insert, then select P (Park) or N (Neutral), press the brake, and press ENGINE START/STOP; replace the battery soon.
Page 19 in the 2025 manual →What should I do when the transmission hot message appears?
2025
The message means automatic transmission fluid is too hot; stop and idle the engine until the fluid cools, or driving may damage the vehicle.
Page 225 in the 2025 manual →2015–2020
Change the automatic transmission fluid and filter at the scheduled maintenance intervals, using the fluid listed in Recommended Fluids and Lubricants.
Page 344 in the 2020 manual →When do the automatic headlights turn on?
2025
With the exterior lamp control in AUTO and darkness outside, the headlamps turn on automatically.
Do not cover the light sensor on top of the instrument panel, or the headlamps may turn on unnecessarily.
Page 147 in the 2025 manual →How do I switch between low and high beams?
2025
Push the turn signal lever toward the instrument panel for high beams; pull or push it to return to low beams.
Page 147 in the 2025 manual →Can the fuel cap cause the check engine light to turn on?
2025
Yes. A wrong replacement fuel cap may not fit properly, turn on the malfunction indicator lamp, and damage the fuel and emissions systems.
Page 278 in the 2025 manual →Should I adjust the spark plug gap on my 6.6L V8?
2025
For the 6.6L V8 (L8T), use the manufacturer-preset 0.95-1.10 mm (0.037-0.043 in) gap; do not re-gap it because this can damage the spark plug.
Page 408 in the 2025 manual →2023–2024
For the 6.6L V8 (L8T), the manufacturer presets the spark plug gaps and does not recommend re-gapping because it can damage the plugs.
Page 405 in the 2024 manual →How long does remote start run before it shuts off?
2025
A remote start runs for 15 minutes, or until the remaining 30-minute total is used; after 30 total minutes, start and turn off the vehicle before using it again.
Page 22 in the 2025 manual →How do I switch between low- and high-beam headlamps?
2023–2024
Push the turn signal lever toward the instrument panel for high beams; pull or push it to return to low beams.
Page 147 in the 2024 manual →How do I reset the engine oil life system?
2023–2024
- Display the oil life percentage on the Driver Information Center.
- Press the steering-wheel thumbwheel, or the trip odometer reset stem without DIC controls, for several seconds.
- When the confirmation message appears, select YES; the oil life changes to 100%.
How do I replace the passenger compartment air filter?
2015–2020
- Open the lower glove box door completely, then push the dampener arm left until it releases the glovebox.
- Press the glovebox door sides inward and rotate the door downward to remove it.
- Pull the filter-door lever left, slide the door left, remove the door, and take out the old filter.
- Install the new air filter, reinstall the filter door, and reverse the steps to reinstall the glove box.
GMC Sierra Denali complaints to NHTSA
Complaints that owners filed with NHTSA for each model year. They are unverified reports and are not adjusted for how many vehicles were sold.
| Year | Complaints | Crashes / fires / injuries | Most reported areas |
|---|---|---|---|
| 2025 | 0 | 0 / 0 / 0 | None reported |
| 2024 | 525 | 7 / 3 / 10 | Engine (205), Power train (111), Electrical system (90) |
| 2023 | 545 | 11 / 2 / 4 | Engine (214), Power train (125), Structure (88) |
| 2020 | 11 | 0 / 0 / 0 | Engine (6), Forward collision avoidance (2), Service brakes (2) |
| 2019 | 26 | 0 / 0 / 1 | Service brakes (8), Steering (7), Unknown or other (5) |
| 2018 | 17 | 0 / 0 / 1 | Engine (5), Structure (4), Service brakes (4) |
| 2017 | 479 | 23 / 7 / 9 | Power train (153), Service brakes (140), Engine (72) |
| 2016 | 132 | 6 / 2 / 7 | Service brakes (27), Steering (27), Engine (20) |
| 2015 | 937 | 35 / 16 / 17 | Service brakes (251), Exterior lighting (162), Power train (124) |
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All GMC Sierra Denali manuals
| Year | Generation | Pages | File |
|---|---|---|---|
| 2025 | 2025 | 442 pages | 29.8 MB |
| 2024 | 2023–2024 | 440 pages | 9.7 MB |
| 2023 | 2023–2024 | 430 pages | 13.9 MB |
| 2020 | 2015–2020 | 501 pages | 8.0 MB |
| 2019 | 2015–2020 | 472 pages | 9.4 MB |
| 2018 | 2015–2020 | 505 pages | 8.7 MB |
| 2017 | 2015–2020 | 511 pages | 7.2 MB |
| 2016 | 2015–2020 | 399 pages | 5.8 MB |
| 2015 | 2015–2020 | 439 pages | 4.9 MB |
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