2020 GMC Sierra electrical problems
81 of the 479 complaints owners filed with NHTSA about the 2020 GMC Sierra name the electrical system (NHTSA’s “Electrical System” heading — wiring, modules, batteries, charging, infotainment and driver displays — NHTSA's broadest heading). Filed under the same heading: 452 manufacturer bulletins, 1 recall. Every figure below is a document in a federal file, linked; none is a failure rate, and none is a verdict on any one car.
What owners filed about the electrical system
Source: NHTSA complaint database0 of the 81 reports a crash · 2 a fire · 1 injury. Self-reported, unverified.
Filed per year: 2020: 15 · 2021: 11 · 2022: 2 · 2023: 6 · 2024: 8 · 2025: 27 · 2026: 12
Half of the 23 owners who gave an odometer reading reported the electrical problem between 2,000 and 32,000 miles. A median of reports, not the life of a part.
479 complaints in all about the 2020 GMC Sierra, 12 filed in 2026. The whole picture, every system →
Counts are owner reports to NHTSA, not verified defects, and scale with how many of these were sold; nothing here is a rate. NHTSA groups complaints coarsely, so “Electrical System” means the same area of the vehicle, not one fault.
Across model years: GMC Sierra electrical problems, every year on file →
In owners’ own words
Source: NHTSA complaint databaseFiled with NHTSA by the people who own these cars, about the electrical system. Quoted as written, with anything identifying removed; unverified reports — what was said, not a finding that it was true.
The contact owns a 2020 GMC Sierra Denali. The contact stated while driving 65 MPH at night, the vehicle stalled and the “Shift to Neutral and Restart Vehicle” message was displayed. The contact was unable to restart the vehicle and was unable to visibly see the roadway. The contact was able to park on the side of the road.
Keep getting "service safety restraint system " alerts. Vehicle only has 550 miles. Alerts are intermitent when driving. Contacted the dealer and was advised that unless it remains on they could not trace the issue
Display is dangerously too bright when backing up cannot see to back up vehicle safely
Vehicle does not start and flashing various codes service just about everything on the vehicle
The night time backup camera is really bright and blurry and it makes it hard to see when backing at night
What is on file about the electrical system
Source: NHTSA recalls, investigations and manufacturer communicationsRecall filed under this heading
- 19V888000 CriticalDec 12, 2019 · 350,371 vehicles
- General Motors LLC (GM) is recalling certain 2019-2020 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks. The battery positive (B+) cable rings may have been manufactured with excessive glue, potentially causing an intermittent electrical connection between the B+ cable and alternator.
452 manufacturer bulletins filed under this heading
The 0 newest are listed; every one is on the model year’s page. Quote the document number at a service desk — it is a diagnosis the maker has already written down.
Trouble codes named on this system
P12A6 P30BF P0300 P0442 P0455 P26BB B2B0D B2B0E
Codes a bulletin or an owner’s complaint about the 2020 GMC Sierra names on this model year; a code with a record of its own links it.
Other systems with a record on the 2020 GMC Sierra
Source: the same files- engine problems 260 complaints
- transmission and drivetrain problems 97 complaints
- brake problems 55 complaints
Common questions
Source: NHTSA complaint database, recalls and manufacturer communicationsAre electrical problems common on the 2020 GMC Sierra?
They are documented: NHTSA holds 81 owner complaints naming the electrical system on this model year (17% of everything owners filed about it), and 452 manufacturer bulletins, 1 recall are filed under the same heading. Whether it is a problem on one particular car is a diagnosis, not a count, and a count says nothing about how many were sold.
Is there a recall for the electrical system on the 2020 GMC Sierra?
Yes — one campaign is filed under this heading: 19V888000. A recall is matched by VIN; check yours at nhtsa.gov/recalls.
When do electrical problems show up on the 2020 GMC Sierra?
Owners who gave an odometer reading reported it at a median of 6,400 miles; half of them between 2,000 and 32,000. That is when reports cluster, not the life of a part.
What does NHTSA's "Electrical System" heading cover?
Wiring, modules, batteries, charging, infotainment and driver displays — NHTSA's broadest heading. Owners choose the heading when they file, so it says which area of the vehicle the complaint is about, not which part failed.