2021 Chevrolet Silverado 3500 Other or unknown Problems
- Complaints
- 5about this part
- Share
- 12%of 41 total for the year
- Median mileage
- —not reported
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 5 complaints about the other or unknown of the 2021 Chevrolet Silverado 3500, 12% of the 41 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.
“My 2021 chevy 3500hd diesel had the engine light come on and the service emissions system popped up in the info screen. It said in so many miles speed would be limited. I took it to the dealer and they said the def tank would need replaced because the tank wiring connector overheated and would cost me over $2k.”
NHTSA complaint #11716547, filed 2026-02“July 20, we were driving the 2021 3500HD to church w/our single axle trailer w/mower on it when we were stopped at a yield sign and proceeded to pull forward, our truck made a loud boom noise and immediately stopped. Warning lights on the dash began coming on, when the gas pedal was pressed it made a loud RPM sound of engine revving, following by barely coasting action. We were able to drift into the turn lane & get out of danger. We had to be towed to Capital Chevrolet bc something isn't functioning properly. …”
NHTSA complaint #11605693, filed 2024-07“Our tailgate would open on its own intermittingly. We haul our fifth wheel camper and this could cause damage to the RV and our vehicle. There have been recalls on one year older trucks and one year newer but not for the 2021Chevrolet Silverado. A Chevrolet dearlership in Florida looked at it for us. They said cause : checked for codes and bulletins. Found code B153D. Completed circuit check. Also found tailgate hatch out of adjustment. Corrctionj: Rec. replace switch and adjust latch. We were charged $486.05 for this. We feel this should be a recall problem. Please advise.”
NHTSA complaint #11658907, filed 2025-05“While towing my 5th wheel rv trailer, the rear wheels locked up numerous times while at highway speeds(60-70mph). Hope our didn't cause any internal/ structural damage to my trailer. Scheduled a service with the dealer(Gamblins Chevrolet, Enumclaw, WA) for them to diagnose. The dealer found no issue or cause. Left the dealer for the same thing to occur the following week. Brought back to the dealer for this issue and others to determine the torque converter had failed, dealer replaced converter, at a later date rear wheels locked up at highway speeds again. Been ongoing with no solution.”
NHTSA complaint #11625523, 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 | 3 | 25% |
| 2024 | 6 | 12% |
| 2023 | 1 | 6% |
| 2022 | 5 | 19% |
| 2021 | 5 | 12% |
| 2020 | 2 | 5% |
| 2019 | 4 | 18% |
| 2018 | 2 | 11% |
| 2017 | 1 | 8% |
| 2016 | 4 | 8% |
| 2015 | 5 | 10% |
| 2014 | 1 | 10% |
| 2013 | 5 | 19% |
| 2012 | 1 | 4% |
| 2011 | 4 | 14% |
| 2009 | 2 | 20% |
| 2008 | 4 | 13% |
| 2007 | 1 | 3% |
| 2006 | 2 | 4% |
| 2004 | 1 | 2% |
| 2003 | 1 | 2% |
| 1999 | 2 | 4% |
| 1998 | 1 | 1% |
| 1997 | 3 | 5% |
Other parts of the 2021 Chevrolet Silverado 3500
13 complaintsTransmission and drivetrain
7 complaintsLatches, locks and linkages
6 complaintsBody and structure
6 complaintsBrakes
5 complaintsFuel system
5 complaintsEngine
3 complaintsAir bags
2 complaintsSteering
2 complaintsExterior lighting
1 complaintsForward collision avoidance
1 complaintsLane departure
1 complaints
← All problems reported for the 2021 Chevrolet Silverado 3500
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 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