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Your vehicleHome›GMC›Sierra 3500HD› 2020
GMC · Pickup truck

2020 GMC Sierra 3500HD

Heavy-duty pickup
0 EPA-rated configurations
Data refreshed 2026-10-26
F
Safety Signal
35 / 100 from the NHTSA recall record
Recalls5 critical 8
Complaints4 crash · 2 fire · 4 injured reported 51
Crash ratingnot rated by NHTSA —
20262025202420232022202120202019201820172016

The 2020 GMC Sierra 3500HD is a pickup truck; vehicles over 8,500 lb GVWR are not certified for fuel economy by the EPA, so this page is built from NHTSA's recall, complaint and investigation records. NHTSA lists 8 recall campaigns for this model year, 5 rated critical, which gives it a Safety Signal grade of F. Owners have filed 51 complaints, most often about the power train.

GMC Sierra — photograph via Wikimedia Commons
GMC Sierra · Photo: Ethan Llamas · CC BY-SA 4.0 · Wikimedia Commons

Specs & fuel economy

Source: EPA fueleconomy.gov

No EPA fuel-economy record: the EPA does not certify vehicles over 8,500 lb GVWR. Recall, complaint and investigation data below come from NHTSA.

Specifications filed with NHTSA

Source: NHTSA vPIC

Dimensions Exterior

Body stylePickup
Doors4
GVWR classClass 3: 10,001 - 14,000 lb (4,536 - 6,350 kg)

Engine Basics

Cylinders8
Displacement6.6 L
Engine configurationV-Shaped

Fuel Economy

FuelDiesel

Seating

Seat rows2
Seating capacity6 seats

Transmission

Drivetrain4WD/4-Wheel Drive/4x4
TransmissionAutomatic
Transmission speeds6

Driver assistance

Standard: Anti-lock brakes, Automatic emergency braking, Backup camera, Blind-spot monitoring, Electronic stability control, Forward collision warning, Lane departure warning, Lane keeping assist, Parking assist, Rear cross-traffic alert

Filed by the manufacturer with NHTSA under the federal vehicle-identification rule and decoded from the VIN pattern — not a manufacturer press kit, so it describes the configurations we could identify rather than every trim (seen: AT4, Denali, Fleet/Base, LT). Figures for the trim you are looking at may differ.

Dimensions & weight

Source: Transport Canada
Length235.4–266.1 in
Width (body, without mirrors)81.9 in
Height79.9–80.7 in
Wheelbase141.7–172.0 in
Track, front67.3 in
Track, rear68.1 in
Curb weight6,338–7,172 lb
Weight distribution, front/rear57/43

Measured by Transport Canada for its Canadian Vehicle Specifications database, which covers the North American versions of each model — here 14 configurations: Crew Cab L/Box Drw 2WD, Crew Cab L/Box Drw 4X4, Crew Cab L/Box Srw 2WD, Crew Cab L/Box Srw 4X4, Crew Cab M/Box 2WD, Crew Cab M/Box 4X4 …. Where a range is shown, those versions differ. Width is the body without mirrors, which is why it can read narrower than a brochure figure. Before we used it we checked it against the US manufacturer press kits we hold (27 Sep 2026): wheelbase agreed within 1% on every vehicle we could compare, length on 98%, and the curb weight fell inside the manufacturer's range on 96%. Source dataset. Contains information licensed under the Open Government Licence – Canada. Licence.

Also on file Beside the 2020 Sierra 3500HD
Other years The 2025 Sierra 3500HD Recalls GMC recalls
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Factory warranty running out?

The 2020 GMC Sierra 3500HD is in the years where transmission, electronics and drivetrain repairs land on the owner. What an extended plan does and does not cover is worth reading before a dealer quotes you one.

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Recalls (8)

Source: NHTSA recall database
!critical

Power Train

N252516560
1,055 vehicles 60% reported repaired built Dec 8, 2019 – Dec 8, 2019
Problem General Motors, LLC is recalling certain 2020 Chevrolet Silverado 2500, 3500, GMC Sierra 2500, 3500, and 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles that may have been repaired incorrectly under recall 24V797. The transmission control valve may fail and cause the rear wheels to lock up. Risk Rear wheel lock up increases the risk of a crash. Fix Dealers will inspect the vehicles and update the transmission control software, free of charge. Owner notification letters were mailed March 6, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252516560. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on February 12, 2026.
Filed with NHTSADefect report PDFOwner letter PDFRemedy instructions PDF
NHTSA campaign 26V083000 reported Feb 12, 2026 General Motors, LLC the full filing, and every vehicle covered →
!critical

Power Train

N242454440
463,295 vehicles 78% reported repaired
Problem General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Silverado 1500, 2500, 3500, GMC Sierra 1500, 2500, 3500, 2021 Cadillac Escalade, Escalade ESV, Chevrolet Tahoe, Suburban, GMC Yukon, and Yukon XL vehicles equipped with diesel engines. The transmission control valve may fail and cause the rear wheels to lock-up. Risk Rear wheel lock-up can increase the risk of a crash. Fix Dealers will install new transmission control module software, free of charge. GM will provide a special coverage program to cover the repair of transmissions that are identified by the remedy software as containing a defective control valve. Owner notification letters were mailed December 12, 2024. Owners may contact GM customer service at 1-888-988-7267, Cadillac customer service at 1-800-458-8006, GMC customer service at GMC 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020.
Filed with NHTSADefect report PDFOwner letter PDFRemedy instructions PDF
NHTSA campaign 24V797000 reported Oct 24, 2024 General Motors, LLC the full filing, and every vehicle covered →
▲high

Latches/Locks/Linkages

N232426400
570,434 vehicles 74% reported repaired
Problem General Motors, LLC (GM) is recalling certain 2020-2024 Chevrolet Silverado 2500, 3500, GMC Sierra 2500 and 3500 vehicles equipped with power-unlatching tailgates. The tailgate's electronic gate-release switch may short circuit due to water intrusion, which can result in the tailgate inadvertently unlatching while the vehicle is in park. Risk An unlatched tailgate may open while driving and result in a loss of unsecured cargo, creating a road hazard and increasing the risk of a crash. Fix Owners are advised to check that the tailgate is closed and latched before driving. Dealers will replace the exterior touchpad switch assemblies, free of charge. Owner notification letters were mailed May 17, 2024. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is N232426400.
Filed with NHTSAOwner letter PDFRemedy instructions PDF
NHTSA campaign 24V060000 reported Feb 1, 2024 General Motors, LLC the full filing, and every vehicle covered →
▲high

Seat Belts

N202314670
624,216 vehicles 90% reported repaired
Problem General Motors, LLC (GM) is recalling certain 2019-2021 Chevrolet Silverado 1500 and GMC Sierra 1500, 2021 Chevrolet Suburban and Tahoe and GMC Yukon XL and 2020-2021 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles. The seat belt brackets may not be secured to the seat frame in the front-row center seating position. Risk If a seat-belt bracket is not secured, the seat belt may not properly restrain an occupant in the front-row center seat position, increasing the risk of injury in a crash. Fix GM will notify owners, and dealers will inspect left-side and right-side front-row center seat-belt bracket attachments and reassemble it correctly as necessary, free of charge. The recall began January 26, 2021. Owners may contact GMC customer service at 1-800-462-8782, Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N202314670.
Filed with NHTSAOwner letter PDF
NHTSA campaign 20V792000 reported Dec 17, 2020 General Motors, LLC the full filing, and every vehicle covered →
▲high

Air Bags

N202305380
769 vehicles 93% reported repaired
Problem General Motors, LLC. (GM) is recalling certain 2020 Buick Enclave, Cadillac XT5 and XT6, Chevrolet Blazer, Silverado 1500, 2500 and 3500 and Traverse and GMC Acadia and Sierra 1500, 2500 and 3500 vehicles. The diffuser component of the Roof-Rail Air Bag (RRAB) inflator may not have been properly crimped to the inflator and could separate from the inflator during air bag deployment. Risk If the diffuser separates from the inflator during deployment, RRAB performance may be degraded, increasing the risk of injury in a crash. Fix GM will notify owners, and dealers will replace the suspect RRAB modules, free of charge. The recall began September 3, 2020. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-333-4223, or Buick customer service at 1-800-521-7300. GM's number for this recall is N202305380.
Filed with NHTSAOwner letter PDF
NHTSA campaign 20V446000 reported Jul 30, 2020 General Motors LLC the full filing, and every vehicle covered →
!critical

Structure

N202306490
272 vehicles 72% reported repaired
Problem General Motors LLC (GM) is recalling certain 2020 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles previously recalled under 20V-142. Some of the vehicles in 20V-324 were not part of Recall 20V-142 but received defect parts during another service (typically during collision repair). The hood-latch striker wires on replacement hoods installed for Safety Recall 20V-142 may not have been heat-treated properly, possibly causing them to fracture. Risk If a striker wire fractures, the hood may open unexpectedly while driving, increasing the risk of a crash. Fix GM will notify owners, and dealers will replace the hood assembly, free of charge. For hoods sold over the counter, dealers will contact customers with instructions for hood replacement. The recall began July 7, 2020. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-888-988-7267. GM's number for this recall is N202306490.
Filed with NHTSADefect report PDF
NHTSA campaign 20V324000 reported Jun 4, 2020 General Motors LLC the full filing, and every vehicle covered →
!critical

Latches/Locks/Linkages

N192284960
1,909 vehicles 90% reported repaired
Problem General Motors LLC (GM) is recalling certain 2020 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles. The hood-latch striker wires may not have been heat-treated properly, possibly causing them to fracture. Risk If a striker wire fractures, the hood may open unexpectedly while driving, increasing the risk of a crash. Fix GM will notify owners, and dealers will replace the hood assembly, free of charge. The recall began April 13, 2020. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-888-988-7267. GM's number for this recall is N192284960.
NHTSA campaign 20V142000 reported Mar 12, 2020 General Motors LLC the full filing, and every vehicle covered →
!critical

Seat Belts

N192270600
556,399 vehicles 95% reported repaired built Jan 28, 2019 – Oct 31, 2019
Problem General Motors LLC (GM) is recalling certain 2019-2020 Chevrolet Silverado 1500 and GMC Sierra 1500, and 2020 Silverado 2500, Silverado 3500, Sierra 2500, and Sierra 3500 vehicles equipped with carpet floor covering. When the front seat belt pretensioners deploy, hot gas may vent through an opening in the pretensioner bracket, possibly igniting the carpet. Risk A vehicle fire could result if materials ignite inside the vehicle. Fix GM will notify owners, and dealers will close off the opening in the pretensioner bracket, free of charge. The recall began December 13, 2019. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-888-988-7267. GM's number for this recall is N192270600.
Filed with NHTSAOwner letter PDF
NHTSA campaign 19V814000 reported Nov 14, 2019 General Motors LLC the full filing, and every vehicle covered →

These are vehicle campaigns — the ones the automaker filed against this model. NHTSA also records equipment recalls, filed by a parts maker against a component (a tyre, a child seat, an aftermarket part), and those are not listed here or counted above. nhtsa.gov/recalls shows both for a VIN.

NHTSA defect investigations

Air Bags:Srs Malfunction Warning Lamp/Light — Air Bag Malfunction closed

On April 9, 2021, the Office of Defects Investigations (ODI) opened PE21-010 to investigate instances of air bag malfunction indicator light (MIL) illumination and potential for frontal air bag non-deployment in several vehicles manufactured by General Motors (GM). The vehicles included model year (MY) 2020 through 2021 CT4 and CT5 passenger cars, Sierra and Silverado trucks (1500/2500/3500 models), XT4 and MY 2021 Escalade, Suburban, Tahoe, Yukon SUVs. Technical Service Bulletin (TSB) 21-NA-005, issued in March 2021, addresses air bag MIL illumination with diagnostic trouble codes (DTCs) B0001-1B or B0012-0D. It cites rust particles in the connection terminal interface of the driver air bag

Opened Apr 9, 2021 · closed Aug 24, 2023 · action PE21010 · the investigation’s page →

Whether any of this applies to one specific Sierra 3500HD

A campaign covers a build range, not a model year, so two identical-looking cars from 2020 can differ. Both of these check a VIN against the manufacturer’s own list, free, in about ten seconds. GMC publishes its own lookup because federal rule 49 CFR 573.15 requires it to, and to keep it current to within seven days.

NHTSA VIN check →GMC’s own VIN lookup →

Hear about a recall before the letter does

The manufacturer’s letter is the last step of a recall: it has up to 60 days after filing to mail owners, at the address on the registration. We email you the day NHTSA posts a recall on the 2020 GMC Sierra 3500HD, with what to do next. Nothing else, ever — no newsletter, no marketing, one-click unsubscribe in every message.

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Parts & accessories for the 2020 GMC Sierra 3500HD

Search by fitment on eBay Motors — OEM take-offs, aftermarket, and the trim pieces dealers no longer stock. The listing and the price are the seller's.

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Owner complaints

Source: NHTSA complaint database
51complaints filed

4 involved a crash · 2 a fire · 4 injuries · 0 deaths reported

25 per 10,000 built · GMC reported 20,662 Sierra 3500HD built (its Early Warning production report to NHTSA)

Filed per year: 2019: 1 · 2020: 2 · 2021: 5 · 2022: 8 · 2023: 5 · 2024: 13 · 2025: 15 · 2026: 2

Most-cited components

Power Train 19
Electrical System 9
Service Brakes 7
Engine 7
Unspecified 6
Fuel/Propulsion System 6

In owners' own words

Filed with NHTSA by the people who own these cars, one per problem area. Quoted as written, with anything identifying removed.

There is a current safety recall N232426400 on GMC pickups including the year of my truck. GMC is saying that my VIN is not covered by the recall. However, I have the multi-pro tailgate and it came open about 6 months ago on its own as i was backing up and it caused me to run into my trailer with the tailgate.
Structure Aug 1, 2024 NHTSA owner report · ODI 11605969
driving 65mph on interstate, attempted to change lanes to pass slower vehicle and pressed upon accelerator pedal...truck violently skidded to a stop and sent me onto shoulder, many vehicles behind me swerved to avoid my vehicle. GM wont repair and says since they cant replicate its not really happening.
Power Train Jul 15, 2024 NHTSA owner report · ODI 11602485
Vehicle will not start due to known GM issues. This failure left my family stranded in cold dark unsafe area once already. If we were in the flow of traffic or had to leave an area immediately we would have been unable too. Known GM issue, engine fault code P12A6 fault code. Bulletin: PIP5719A discusses this issue.
Electrical System Feb 6, 2024 NHTSA owner report · ODI 11570194
The contact owned a 2022 GMC Sierra. The contact stated that while her husband was driving at an undisclosed speed, the vehicle collided head-on with another vehicle that ran a red light. The air bags did not deploy. No warning lights were illuminated. A police report was filed.
Air Bags at 24,000 miles Aug 21, 2023 NHTSA owner report · ODI 11539857
The contact owns a 2020 GMC Sierra 3500 equipped with Goodyear Tires, Tire Line: Wrangler Trail Runner, Tire Size: LT275/65/R20), DOT Number: (NA). The contact stated that while driving approximately 40-45 MPH, the vehicle exhibited the death wobble, causing the vehicle to become difficult to steer.
Tires at 29,400 miles May 17, 2023 NHTSA owner report · ODI 11522434
The computer lite up the dash and reduced power, plus took the trailer brakes off line. This happened while loaded. To reset the system you have to pull over and turn the vehicle off. This happens 2-3 times per day. This was a problem at 600 miles. The transmission shifted from 10 gear to 5th gear while driving 75 miles per hour.
Service Brakes May 26, 2021 NHTSA owner report · ODI 11418595

Complaint counts are raw owner reports to NHTSA, not verified defects, and scale with how many were sold. Use them to spot patterns, not to rank.

Reported by GMC itself: 8 death-or-injury claims on this model year in its quarterly Early Warning reports to NHTSA (49 CFR 579.21): 14 injured, as claimed, not verified — about 39 per 100,000 built. Every Sierra 3500HD model year, by year and system → Dated and by system, they are exhibit F of the defect dossier.

Crash ratings

Source: NHTSA NCAP

NHTSA has not published 5-Star crash ratings for this model year.

Service bulletins & campaigns

Source: NHTSA manufacturer communications
Extended coverage on file 4 filings by the manufacturer with NHTSA naming this model year

The term and the vehicles it covers are the manufacturer’s, as NHTSA’s summary of each filing states them; a dealer checks one particular car by its VIN. Every GM warranty extension (33) → · Every warranty extension on file, all makes →

Communicationsfiled with NHTSA 906
Most recentmanufacturer date 2026-09-26
Kindsas classified by NHTSA 898 service bulletins, 6 service campaigns, 1 warranty extension

Most often about: Engine, Equipment, Electrical System, Unknown Or Other, Power Train.

  • PIT5698F Service bulletin
    2026-09-26 · Unknown Or Other
  • This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
  • PIP4902W Service bulletin
    2026-09-04 · Unknown Or Other
  • This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
  • PIP6127A Service bulletin
    2026-08-27 · Unknown Or Other
  • This document assists GM dealer technicians with diagnosing torque converter concerns to ensure torque converter replacement is necessary. The torque converter part number will be placed on order restriction, and the technician will be asked to follow 25-NA-148 before requesting a part through PQC.
  • PIT6031B Service bulletin
    2026-08-07 · Unknown Or Other
  • This Preliminary information communicates an issue where an aftermarket autostop device or rear taillights is causing a dead battery.
  • PIT5680B Service bulletin
    2026-07-23 · Unknown Or Other
  • This PI provides information to repair the door water deflector which is not sealed properly allows water into the door jam/sill area.
  • PIT5099J Service bulletin
    2026-07-21 · Unknown Or Other
  • PI to help diagnose A/C concern
  • PIT5509N Service bulletin
    2026-07-21 · Unknown Or Other
  • This PI provides diagnostic tips for diagnosing electric trailer brakes issues.
  • PIT6473F Service bulletin
    2026-07-17 · Unknown Or Other
  • This PI was created to help avoid unnecessary front camera module replacements

A service bulletin is the manufacturer telling its dealers how to diagnose or repair a known condition. It is not a recall, not a finding that the vehicle is defective, and the work is not automatically free — though a bulletin is often what a dealer works from when you describe a symptom, so quoting the document number can save a diagnosis. The count is every communication filed; the list shows the most recent, one entry per campaign, because a single campaign is usually filed as several documents on the same day. The summaries are NHTSA's; the full documents come from the manufacturer.

Diagnostic trouble codes on file

Source: NHTSA manufacturer communications and complaints

Codes documented against this model year in the federal record. A code appearing here does not mean this vehicle will set it — it means the code is part of this nameplate-year's documented history.

CodeWhat it meansMost often filed underWhere it appears
P12A6
P12A6 on GMC →		Manufacturer-defined — the meaning is set by the automaker, not the standard.Engine11 bulletins · 1 owner report
P2463
P2463 on GMC →		Soot has built up in the diesel particulate filter beyond the allowed limit.Engine8 bulletins
P0747
P0747 on GMC →		Manufacturer-defined — the meaning is set by the automaker, not the standard.Power Train6 bulletins · 1 owner report
P0442
P0442 on GMC →		A small leak in the evaporative emissions system.Engine · Gas cap →6 bulletins
P0455
P0455 on GMC →		A large leak in the evaporative emissions system — often a fuel cap left off.Engine · Gas cap →6 bulletins
P20EEThe selective catalytic reduction catalyst is not reducing NOx to standard.Equipment5 bulletins · 1 owner report
P0446
P0446 on GMC →		A fault in the evaporative vent control circuit.Engine · EVAP vent valve →5 bulletins
P0449
P0449 on GMC →		A fault in the evaporative vent valve or solenoid circuit.Engine · EVAP vent valve →5 bulletins
P129F
P129F on GMC →		Manufacturer-defined — the meaning is set by the automaker, not the standard.Engine4 bulletins · 1 owner report
B2B0D
B2B0D on GMC →		Manufacturer-defined — the meaning is set by the automaker, not the standard.Electrical System · Battery →4 bulletins
B2B0E
B2B0E on GMC →		Manufacturer-defined — the meaning is set by the automaker, not the standard.Electrical System · Battery →4 bulletins
P16F3Manufacturer-defined — the meaning is set by the automaker, not the standard.Electrical System · Battery →4 bulletins

Generic codes (the second character is 0 or 2) mean the same thing on every vehicle sold in the United States. Manufacturer-specific codes (1 or 3) mean whatever the automaker assigned, and no honest source can define them for you — which is why the ones here carry the evidence instead of a definition. A code is a link when enough separate federal documents name it across the catalogue to be worth a page of its own; the rest are listed here, where the vehicle is the context that makes them mean something.

Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.

Sierra 3500HD by model year

all years, side by side →
Year Safety Recalls Complaints
2026 B 2 5 2025 A 1 17 2024 C 3 50 2023 A 1 28 2022 D 3 32 Park outside2021 F 5 20 Park outside2020 this page F 8 51 2019 F 7 13 2018 F 6 14 2017 F 7 13 2016 F 7 19

Common questions about the 2020 Sierra 3500HD

Source: EPA, NHTSA and manufacturer press kits

Does the 2020 GMC Sierra 3500HD have any recalls?

NHTSA has posted 8 recall campaigns for the 2020 GMC Sierra 3500HD, 5 of them rated critical. The most serious on file is 26V083000, covering Power Train. Check your own VIN at nhtsa.gov/recalls; a recall applies to specific build ranges, not every car.

How safe is the 2020 GMC Sierra 3500HD?

NHTSA has not published a crash-test rating for the 2020 GMC Sierra 3500HD yet. On the recall record WhichTrim grades it F (35/100), which measures open and severe recalls rather than crash protection.

What are the dimensions of the 2020 GMC Sierra 3500HD?

Transport Canada measured it at 235.4–266.1 in long, 81.9 in wide (body, without mirrors), 79.9–80.7 in tall, on a 141.7–172.0 in wheelbase. Curb weight: 6,338–7,172 lb depending on configuration. Those are its measurements of the North American versions; every figure is in the table above.

What do owners complain about on the 2020 GMC Sierra 3500HD?

Owners have filed 51 complaints with NHTSA about the 2020 GMC Sierra 3500HD, most often about power train, electrical system, service brakes. Of those, 4 involved a crash, 2 a fire, 4 reported injuries. Complaints are unverified owner reports, so treat the pattern as a signal and the individual report as an anecdote.

Are there service bulletins for the 2020 GMC Sierra 3500HD?

The manufacturer has filed 906 service bulletins and related communications with NHTSA for the 2020 GMC Sierra 3500HD, most often covering engine, equipment, electrical system. The most recent is dated 2026-09-26. A bulletin is not a recall: it is the repair procedure a manufacturer sends its dealers for a condition it knows about, and the work is not automatically paid for. It is still worth knowing — if the symptom matches, quoting the bulletin number at the service desk can save a diagnosis. The document numbers and summaries are listed above.

What we hold, and what an empty row means

Paid vehicle-history reports will not tell you the difference between “nothing happened to this car” and “we never received that record” — both of the big two say as much in their own help pages. Most of what is on this page comes from complete federal registers, so we can tell you which is which, row by row.

DataHeldSourceWhat it covers — or what empty means
Fuel economy & configurationsnoneEPA certification recordsThe EPA does not certify vehicles rated over 8,500 lb GVWR, so heavy-duty nameplates have no entry at all.
Emission certificatesnoneEPA emission certificatesThe EPA published no certificate we could match to a configuration on this page.
Recalls8NHTSA recall campaignsA complete federal register: every campaign covering this model year, with severity and advisory flags.
Owner complaints51NHTSA complaint databaseAlso complete, but unverified: these are reports owners filed, not findings. Counts scale with how many were sold.
Crash ratingsnoneNHTSA NCAPNHTSA has not tested this model year. Cars are selected for testing, so untested is not unsafe.
Service bulletins906NHTSA manufacturer communicationsEverything the manufacturer told its dealers about a defect or malfunction, short of a recall.
Investigations1NHTSA Office of Defects InvestigationOpen and closed defect investigations, with the agency's own narrative.
Driver-assist crash reportsnoneNHTSA Standing General Order 2021-01No report has been filed. Only entities named in the order report, and only crashes they hear of — so this is also what an unequipped car, or a manufacturer without telematics, looks like.
Specifications filed with NHTSA12 fieldsNHTSA vPIC, decoded from VIN patternsWhat the manufacturer filed under the federal VIN rule — a configuration, not the full trim ladder.
Measured dimensions7 fieldsTransport Canada, Canadian Vehicle SpecificationsLength, width, height, wheelbase, track and curb weight, measured on the North American versions.
Trims, pricing & equipmentnoneManufacturer press kitWe have not transcribed a press kit for this model year yet. This is our gap, not the manufacturer's — the one row here where an empty cell means we are behind.

Rebuilt nightly; this page was generated 2026-10-26. Every figure above is traceable to the source named beside it, and the JSON for this page carries the same values with their identifiers.

Where to go next

pages beside this one
Other years The 2025 Sierra 3500HD The Sierra 3500HD model year with the cleanest record on file — grade A, 1 recall.Recalls Every GMC recall on file All campaigns filed against GMC vehicles, newest first, with the manufacturer's own number.Recall Watch Watch this Sierra 3500HD by VIN Give it the VIN and you hear the night a campaign is filed — from $29 a month for a lot, free for ten.

Sources & method

Safety Signal starts every model-year at 100 and subtracts points per open NHTSA recall campaign by severity: critical 15 (fire risk, park-outside or do-not-drive advisories), high 8 (brakes, steering, airbags, loss of drive power, structure, battery), moderate 6, minor 3 (software, labels, lighting fixed by an update). The most serious recall counts in full and each further one counts 85% of the one before, because a vehicle sold in millions is recalled more often than a rare one without being more dangerous — and because a flat subtraction bottomed the scale out, scoring a vehicle with 22 recalls within a point of one with six. A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, otherwise F. Read it as what it counts: recall campaigns on the federal record, weighted by severity. The damping reduces the sales bias by roughly 40% but does not remove it: like our complaint counts, this is not normalized by how many were sold, so a best-seller still scores somewhat worse than an obscure model with the same real risk. NHTSA crash ratings, do-not-drive and park-outside advisories, and the crash, fire, injury and death counts in owner complaints are reported separately on every page and never blended into the letter — a vehicle can hold five stars and a poor letter at once, and where that happens we say so rather than leave you to notice. Because the scale subtracts from a clean sheet, a model year too new to have been recalled, complained about or bulletined scores full marks on an empty record; we label those grades provisional rather than present them as earned.

EPA figures come from fueleconomy.gov vehicle records. Recalls, complaints, investigations and crash ratings come from NHTSA's public flat files, refreshed nightly.

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