2020 GMC Sierra 3500 Body and structure Problems
- Complaints
- 5about this part
- Share
- 10%of 51 total for the year
- Median mileage
- 50,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 5 complaints about the body and structure of the 2020 GMC Sierra 3500, 10% of the 51 complaints for this model year. Where a mileage was given, the median is 50,000 miles. 1 a fire, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Rear window leaking on 2020 gmc truck due to faulty rear window seal and plastic slide. Known issue in 2020 models with a service bulletin already in place. Headliner saturated and black mold showing. Rear back liner has been saturated multiple times and gmc would not refund the cost of a whole new window to be put in and reimbursed. GM bulletin # is 18-NA-383”
NHTSA complaint #11497794, filed 2022-12“The contact owns a 2020 GMC Sierra 3500. The contact stated that while driving 45 MPH with passengers seated in the rear seats, the passengers became aware that water was entering the vehicle between the window and frame. There were no warning lights illuminated. The vehicle was taken to the local dealer, who informed the contact of Technical Service Bulletin: 18-NA-383. The vehicle was not diagnosed or repaired. The manufacturer was contacted and confirmed that there was no special coverage or warranty coverage on the vehicle. The contact was referred to the NHTSA Hotline for assistance. …”
NHTSA complaint #11670439, filed 2025-07, 50,000 milesRelated service bulletins
- 11022868May 8, 2025This informational bulletin provides information on Anti-Chip Coating Appearance.
- 11016944Mar 11, 2025This service bulletin provides frame coating repair information to correct a customer concern of wax coating on frame peeling, metal shows corrosion/rusting (U.S. and Canada Only).
- 11015605Mar 4, 2025This technical bulletin provides a procedure to correct the condition of Suction Cup Marks on Window Glass.
- 11015146Feb 22, 2025This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regard to the outside rearview…
- 11015382Feb 20, 2025This informational bulletin provides a procedure on how to remove the paint stain that may present itself under the shipping film.
- 11014579Feb 19, 2025This technical bulletin provides repair information to correct a customer concern of Diagnostic Tips For Park Assist Off Message / Unwanted Or False Park Assist Alerts / No DTCs.
- 11014021Feb 1, 2025This technical bulletin provides repair information to correct a customer concern of vertical misalignment between cab and pickup box on driver side of vehicle.
- 11014171Jan 31, 2025This service bulletin provides information on proper use of floor mats.
- 11014238Jan 30, 2025This warranty administration service bulletin provides information about GM Accessories - Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.
- 11013352Jan 23, 2025This informational bulletin provides explanation of a normal condition of a loose fitting trailer hitch receiver in the gooseneck hitch ball.
Body and structure: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 2 | 12% |
| 2024 | 4 | 8% |
| 2022 | 3 | 9% |
| 2021 | 1 | 5% |
| 2020 | 5 | 10% |
| 2011 | 2 | 10% |
| 2008 | 1 | 4% |
| 2007 | 1 | 6% |
| 2004 | 1 | 4% |
| 2001 | 2 | 6% |
| 2000 | 3 | 12% |
| 1999 | 3 | 16% |
| 1998 | 1 | 8% |
| 1997 | 1 | 10% |
Other parts of the 2020 GMC Sierra 3500
19 complaintsElectrical system
9 complaintsBrakes
7 complaintsEngine
6 complaintsFuel system
6 complaintsOther or unknown
6 complaintsTires
4 complaintsVisibility (wipers, defrost, mirrors)
2 complaintsAir bags
1 complaintsEngine cooling
1 complaintsExterior lighting
1 complaintsForward collision avoidance
1 complaints
← All problems reported for the 2020 GMC Sierra 3500
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology