2021 Chevrolet Suburban problems & reliability
182 owner complaints filed with NHTSA for the 2021 Chevrolet Suburban, alongside 12 safety recall campaigns. Last verified Aug 7, 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 vehicles.
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 → | 76 | 42% |
| Power Train → | 35 | 19% |
| Fuel/propulsion System → | 22 | 12% |
| Electrical System → | 17 | 9% |
| Unknown OR Other | 13 | 7% |
| Forward Collision Avoidance → | 11 | 6% |
| Engine and Engine Cooling | 9 | 5% |
| Service Brakes | 8 | 4% |
| Exterior Lighting | 7 | 4% |
| Fuel System, Gasoline | 7 | 4% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 68,500 miles (middle 50% between 33,500 and 92,532 miles), based on 30 complaints that included mileage.
Complaints by incident year
What owners report
“The contact owns a 2021 Chevrolet Suburban used to tow a 30-foot trailer. The contact stated that while towing the trailer and driving 60 MPH up an incline with no shoulder, the vehicle shut off in a remote area. The contact was able to move the vehicle off the roadway. There were no warning lights illuminated. The…”
Engine and Engine Cooling · filed Jul 31, 2026
“The contact owns a 2021 Chevrolet Suburban. The contact stated that while driving on the highway, the vehicle experienced reduced engine power and failed to exceed 30 MPH. A message pertaining to the deceleration was displayed. The following Monday, the vehicle failed to exceed 35 MPH, and a friend followed the…”
Fuel System, Diesel · filed Jul 27, 2026
“Pulled out in 4 lane traffic. Got almost to 55mph. Vehicle lost all power, slowed down and auto shifted to neutral, vehicle stopped and went to park. Vehicle would not start back nor transition to Neutral to remove from highways. 2021 suburban with just 35,000miles. Shut down a lane on a 55mph highway. Code P129F”
Fuel/propulsion System · filed Jul 26, 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
Recall Query RQ26001 · opened Jan 16, 2026 · open
- 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
1,363 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2021 Chevrolet Suburban. The 10 most recent:
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
This Preliminary information communicates an issue with a replace or low FOB battery message
PIT6511 · Service Bulletin/Repair Instructions · issued Apr 25, 2026
This PI communicates information on a SPS programming issue causing Serial Data Authentication Configuration to fail.
PIT6507 · Service Bulletin/Repair Instructions · issued Apr 20, 2026
This preliminary information communicates information about how to determine if a wheel and tires size change is available.
PIT3271Q · Service Bulletin/Repair Instructions · issued Apr 1, 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.
- · Owners most often reported problems around 68,500 miles — budget accordingly if the car is approaching that mileage.