2021 GMC Sierra 3500 Other or unknown Problems
- Complaints
- 3about this part
- Share
- 15%of 20 total for the year
- Median mileage
- —not reported
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the other or unknown of the 2021 GMC Sierra 3500, 15% of the 20 complaints for this model year.
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.
“There is a known issue with these trucks with the infotainment screen blacking out, which renders the backup cameras inoperative. This is a huge safety risk and its astounding to me that this hasn't been recalled yet.”
NHTSA complaint #11660333, filed 2025-05“Vehicle is put into park after driving. Shift to Park warning comes on while vehicle is in park. Vehicle will not shut off due to this warning and must be left running unoccupied.”
NHTSA complaint #11647125, filed 2025-03“Multiple instances of diesel engine emissions system parts and software failure. While driving, towing or not, the DIC would randomly display a message that the DEF level is low and reduced speed will occur in x-amount of miles and that mileage would then begin a visible countdown on the DIC, sometimes much more quickly than the actual speed I was traveling. In other words, it might at first state 500 miles remaining, but then be counting down from 500 miles by one mile per second of time, or faster. …”
NHTSA complaint #11623109, filed 2024-11Related service bulletins
- 11037555Sep 26, 2026This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- 11037253Sep 4, 2026This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- 11036713Aug 27, 2026This document assists GM dealer technicians with diagnosing torque converter concerns to ensure torque converter replacement is necessary. The torque converter part number will…
- 11036392Aug 20, 2026This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues
- 11036196Aug 7, 2026This Preliminary information communicates an issue where an aftermarket autostop device or rear taillights is causing a dead battery.
- 11035350Jul 23, 2026This PI provides information to repair the door water deflector which is not sealed properly allows water into the door jam/sill area.
- 11035340Jul 21, 2026PI to help diagnose A/C concern
- 11035308Jul 21, 2026This PI provides diagnostic tips for diagnosing electric trailer brakes issues.
- 11035133Jul 17, 2026This PI was created to help avoid unnecessary front camera module replacements
- 11034977Jul 6, 2026The purpose of this PI is to inform dealer technicians of a normal cab pressure relief valve noise to avoid unnecessary part replacement
Other or unknown: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 2 | 12% |
| 2024 | 7 | 14% |
| 2023 | 3 | 11% |
| 2022 | 5 | 16% |
| 2021 | 3 | 15% |
| 2020 | 6 | 12% |
| 2019 | 2 | 15% |
| 2017 | 2 | 15% |
| 2015 | 3 | 10% |
| 2013 | 1 | 7% |
| 2012 | 2 | 22% |
| 2011 | 2 | 10% |
| 2008 | 1 | 4% |
| 2002 | 1 | 5% |
| 2000 | 1 | 4% |
Other parts of the 2021 GMC Sierra 3500
7 complaintsBrakes
5 complaintsElectrical system
4 complaintsEngine
3 complaintsFuel system
2 complaintsBack-over prevention (rear camera)
1 complaintsBody and structure
1 complaintsTires
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2021 GMC Sierra 3500
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 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