2021 Chevrolet Suburban problems & reliability
195 owner complaints filed with NHTSA for the 2021 Chevrolet Suburban, alongside 12 safety recall campaigns. Last verified Sep 23, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several components.
2 complaints report injuries (5 injured).
Federal crash records (FARS 2020–2023): 2021 Chevrolet Suburban vehicles were involved in 14 fatal crashes with 2 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Engine → | 85 | 44% |
| Power Train → | 36 | 18% |
| Fuel/propulsion System → | 22 | 11% |
| Electrical System → | 18 | 9% |
| Unknown / Other | 13 | 7% |
| Forward Collision Avoidance → | 11 | 6% |
| Engine and Engine Cooling | 9 | 5% |
| Fuel System, Gasoline | 9 | 5% |
| Service Brakes | 8 | 4% |
| Exterior Lighting | 7 | 4% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 24 reported components →Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Among the 31 complaints that included a usable odometer reading, the median reported incident mileage was 70,000 miles (middle 50% between 34,000 and 92,355 miles).
Complaints by incident year
What owners report
“Our Chevy Suburban High Country suffered sudden engine failure resulting in the vehicle to shake and smoke while driving on a busy intersection. The dealership diagnosed internal engine mechanical failure at only 46,000 miles. I believe this is directly tied to the known GM 6.2 L87 engine issues.”
Engine · filed Sep 19, 2026
“Sudden Loss of Power & Shaking: The misfire itself causes a drastic drop in acceleration. If you are merging onto a highway or trying to pass another vehicle, the sudden loss of power can leave you stranded in the path of oncoming traffic. No Stability Assistance: Because StabiliTrak and Traction Control are…”
Engine · filed Sep 15, 2026
“The radio control unit that controls all the interior features of the car failed due to an over the air update. We can no longer use the radio, gps, hot and cold on the screen or what the rear climate is at, there is no sounds from any of the blinkers or emergency lights.”
Electrical System · filed Sep 15, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Loss of motive power due to engine failure post recall remedy
Engineering Analysis EA26005 · opened Aug 20, 2026 · open
- Loss of motive power due to engine failure post recall remedy
Recall Query RQ26001 · opened Jan 16, 2026 · closed Aug 20, 2026
- Loss of motive power due to engine failure
Engineering Analysis EA25007 · opened Oct 23, 2025 · open
- Loss of motive power due to engine failure
Preliminary Evaluation PE25001 · opened Jan 16, 2025 · closed Oct 23, 2025 · led to recall 25V274
- Air Bag Malfunction
Preliminary Evaluation PE21010 · opened Apr 9, 2021 · closed Aug 24, 2023
Technical service bulletins
1,366 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2021 Chevrolet Suburban. The 10 most recent:
This preliminary information communicates diagnostic tips for air leveling suspension system.
PIT5801F · Service Bulletin/Repair Instructions · issued Sep 10, 2026
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
PIP4902W · Service Bulletin/Repair Instructions · issued Sep 4, 2026
This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues
PIC6551C · Service Bulletin/Repair Instructions · issued Aug 20, 2026
PI to help diagnose A/C concern
PIT5099J · Service Bulletin/Repair Instructions · issued Jul 21, 2026
This PI provides diagnostic tips for diagnosing electric trailer brakes issues.
PIT5509N · Service Bulletin/Repair Instructions · issued Jul 21, 2026
This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and how to reset/clear the message.
PIT5966F · Service Bulletin/Repair Instructions · issued Jun 23, 2026
This PI provides diagnostic tips for diagnosing electric trailer brakes issues.
PIT5509M · Service Bulletin/Repair Instructions · issued May 14, 2026
Pi created to provide GM dealers with information on gathering information for projection issue
PIC6423A · Service Bulletin/Repair Instructions · issued May 11, 2026
This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues
PIC6551B · Service Bulletin/Repair Instructions · issued May 11, 2026
Certain vehicles may have a condition that could cause the cylinder 2 glow plug to fail. If this failure occurs, the Malfunction Indicator Light (Check Engine Light) will illuminate and a diagnostic trouble code will…
N262552620 · Service Campaign · issued May 11, 2026
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2021 Chevrolet Suburban has 12 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2021 Chevrolet Suburban?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Among complaints with usable mileage, the median reported incident mileage was 70,000 miles. This does not predict when a particular vehicle will develop a problem.