2021 Chevrolet Suburban electrical system problems
17 owner complaints filed with NHTSA name the electrical system on the 2021 Chevrolet Suburban — 9% of all complaints for this model year.
What owners report
“Had an engine replacement in dec of 2025 and had to pay for it since wasn’t under warranty or recall. And now my replacement engine which has a warranty now. Just failed in March 2026 which about 3 months later. Had metal shavings in engine and multiple cylinders misfiring. And now I don’t have a…”
filed Apr 4, 2026
“I am submitting this complaint to report a serious safety issue involving my 2021 Chevrolet Suburban equipped with the 3.0L Duramax diesel engine. The vehicle has experienced a recurring problem related to the engine wiring harness. While driving, the vehicle will unexpectedly stall without…”
filed Mar 20, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Suburban years
| Year | Reports | Share |
|---|---|---|
| 2024 Suburban | 4 | 11% |
| 2023 Suburban | 13 | 11% |
| 2022 Suburban | 18 | 17% |
| 2020 Suburban | 8 | 19% |
| 2019 Suburban | 7 | 9% |
| 2018 Suburban | 16 | 20% |
| 2017 Suburban | 21 | 15% |
| 2016 Suburban | 26 | 12% |
| 2015 Suburban | 58 | 14% |
| 2014 Suburban | 7 | 12% |
| 2013 Suburban | 14 | 12% |
| 2012 Suburban | 10 | 10% |
Other reported problem areas on the 2021 Chevrolet Suburban
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.