2020 GMC Sierra 1500 fuel/propulsion system problems
24 owner complaints filed with NHTSA name the fuel/propulsion system on the 2020 GMC Sierra 1500 — 5% of all complaints for this model year.
What owners report
“I again have noticed intermittent pulsing at low to medium speeds. At roughly 1k-2k rpm the engine at or about 10-20 mph is pulsating or hesitating with an obvious pulse which you can see on the tachometer as well (bouncing.) It seems like there is either a computer, fuel flow or electric issue…”
filed May 29, 2026
“I started to notice changes in performance around 75k miles. Seemed like performance was subpar compared to what was the norm. Seemed to lose some power. Minimal at first, more so just recently around 90k. Oil consumption was starting to accelerate at each oil change at 75k, 80k, 85k, 90k. To the…”
filed Dec 26, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Fuel/propulsion System problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 4 | 6% |
| 2025 Sierra 1500 | 6 | 6% |
| 2024 Sierra 1500 | 17 | 5% |
| 2023 Sierra 1500 | 25 | 6% |
| 2022 Sierra 1500 | 21 | 4% |
| 2021 Sierra 1500 | 33 | 6% |
| 2019 Sierra 1500 | 21 | 3% |
| 2018 Sierra 1500 | 10 | 3% |
| 2017 Sierra 1500 | 7 | 2% |
| 2016 Sierra 1500 | 8 | 2% |
| 2015 Sierra 1500 | 13 | 2% |
| 2014 Sierra 1500 | 12 | 2% |
Other reported problem areas on the 2020 GMC Sierra 1500
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.