2020 GMC Sierra 1500 check engine light reports

56 NHTSA complaints describe persistent or recurring check-engine warnings on the 2020 GMC Sierra 1500 — roughly 13% of all complaints for this model year.

Check engine light reports

13%

share of complaints

72,225 mi

median mileage in check engine light reports (24 with odometer)

Components reported on this vehicle

Engine 213 Power Train 88 Electrical System 77 Service Brakes 48 Steering 37 Fuel/propulsion System 24

Check engine light in other Sierra 1500 years

2026 Sierra 1500	5
2025 Sierra 1500	7
2024 Sierra 1500	23
2023 Sierra 1500	35
2022 Sierra 1500	47
2021 Sierra 1500	90
2019 Sierra 1500	71
2018 Sierra 1500	15
2017 Sierra 1500	25
2016 Sierra 1500	14

Sierra 1500 check engine light by year →

Other symptoms owners describe on the 2020 GMC Sierra 1500

Loss of power 45 Vibration / shaking 42 Stalling 24 Clunking / rattling 23 Misfire / rough idle 20 Brake problems 14 Hesitation / surging 12

Symptom counts come from keyword analysis of complaint narratives. One complaint can describe several symptoms, and classification is approximate — read the underlying reports on the full 2020 GMC Sierra 1500 report before drawing conclusions.

Check engine light across all vehicles →