The contact owns a 2026 GMC Sierra 3500. The contact stated that while driving 2 MPH, the steering wheel failed to function as intended. The contact stated that while making a right turn, the vehicle hesitated. The dealer was contacted by phone and made aware of the failure. The vehicle was taken to the dealer and the contact was informed that the vehicle was operating as designed. The contact stated that the failure was not present when the vehicle was purchased. The manufacturer was contacted, and a case was filed. The failure mileage was approximately 4,000.
The worst 2026 GMC Sierra 3500 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Transmission2
- Wheels2
- Brakes1
- Electrical1
- Fuel system1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Transmission2
- Wheels2
- Brakes1
- Electrical1
- Fuel system1
- Steering1
Recalls 2
Fuel system, gasoline: delivery: fuel pump: control/drive module
- What is wrong
- General Motors, LLC (GM) is recalling certain 2025-2026 Chevrolet Silverado 3500, and GMC Sierra 3500 vehicles with gasoline engines and dual fuel tanks (RPOs L8T and N2N). The rear fuel pump may not transfer adequate fuel to the front tank, causing an engine stall.
- Risk
- An engine stall increases the risk of a crash.
- Remedy
- The vehicle's engine control module (ECM) will be updated by a dealer or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed April 8, 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 N262544420. Vehicle Identification Numbers (VINs) involved in this recall became searchable on on March 5, 2026.
Recall number 26V129000 · Recall details
Equipment: other: owners/service/other manual
- What is wrong
- General Motors has decided that certain 2027 Chevrolet Bolt EV, 2025-2026 Cadillac OPTIQ, Chevrolet Colorado, Equinox EV, GMC Canyon, 2026 Buick Enclave, Envision, Cadillac CT5, Escalade, Escalade ESV, Escalade IQ, Escalade IQL, LYRIQ, VISTIQ, Chevrolet Blazer EV, Corvette Convertible, Corvette Coupe, Corvette Convertible E-Ray, Equinox, Silverado 1500, 2500, 3500, Silverado EV, Suburban 1500, Tahoe, Traverse, GMC Acadia, Hummer EV Pickup, Hummer EV SUV, Sierra 1500, 2500, 3500, Sierra EV, Terrain, Yukon, and Yukon XL vehicles. The radio may not have been set to the correct status to download the electronic owner's manual during production. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, “Occupant Protection.”
- Risk
- Without an owner's manual to consult, owners may not know how to safely use and operate the vehicle, increasing the risk of injury in a crash.
- Remedy
- Dealers will reset the vehicle radio, which will facilitate automatic download of the electronic owner’s manual, free of charge. Owner notification letters were mailed April 16, 2026. Owners may contact GM customer service at 1‑866‑467‑9700, Chevrolet customer service at 1‑800‑222‑1020 or Cadillac customer service at 1‑800‑333‑4223. The manufacturer's number for this recall is N252540430. Vehicle Identification Numbers (VINs) involved in this recall became searchable on on February 26, 2026.
Recall number 26V114000 · Recall details
Technical service bulletins for the 2026 GMC Sierra 3500 174
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Unknown or other
- Unknown or other
- Unknown or other
- This PI is to instruct dealer on diagnostic procedures that need to be completed prior to replacing a...
- Customer Satisfaction Program
- Unknown or other
- Unknown or other
- Unknown or other
- Unknown or other
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
What 2026 GMC Sierra 3500 owners say
Most recent owner complaints, unedited.
The vehicle was delivered from the factory with a severe size mismatch between its primary rolling stock and its emergency spare tire. The truck features factory-installed 20-inch wheels and tires but was manufactured and shipped with an undersized 18-inch spare tire assembly secured underneath the bed. On a heavy-duty 3500-series truck built for heavy towing and hauling, utilizing a drastically different tire diameter during an emergency road event forces the rear differential and transfer case to spin at mismatched speeds. This creates an immediate risk of sudden mechanical drivetrain failure, loss of vehicle control, or compromised braking stability while operating under load on public highways. Consumers relying on factory equipment during emergency roadside scenarios should not be exposed to hidden mechanical hazards due to factory assembly omissions. Upon discovering the factory defect, the local dealership attempted remediation by supplying a shop take-off wheel and an aged, three-year-old tire (DOT 2223). This highlights that while individual dealerships scramble to fix these factory omissions with makeshift inventory, consumers purchasing new heavy-duty vehicles are still absorbing compromised, aged safety equipment due to lack of manufacturing quality control. I have also filed a complaint with GM and have requested immediate remediation with a correct new tire and wheel and am waiting for a response.
The vehicle was delivered from the factory with a severe size mismatch between its primary rolling stock and its emergency spare tire. The truck features factory-installed 20-inch wheels and tires but was manufactured and shipped with an undersized 18-inch spare tire assembly secured underneath the bed. On a heavy-duty 3500-series truck built for heavy towing and hauling, utilizing a drastically different tire diameter during an emergency road event forces the rear differential and transfer case to spin at mismatched speeds. This creates an immediate risk of sudden mechanical drivetrain failure, loss of vehicle control, or compromised braking stability while operating under load on public highways. Consumers relying on factory equipment during emergency roadside scenarios should not be exposed to hidden mechanical hazards due to factory assembly omissions. Upon discovering the factory defect, the local dealership attempted remediation by supplying a shop take-off wheel and an aged, three-year-old tire (DOT 2223). This highlights that while individual dealerships scramble to fix these factory omissions with makeshift inventory, consumers purchasing new heavy-duty vehicles are still absorbing compromised, aged safety equipment due to lack of manufacturing quality control. I have also filed a complaint with GM and have requested immediate remediation with a correct new tire and wheel and am waiting for a response.
The contact owns a 2026 GMC Sierra 3500. The contact stated that while driving at 35-40 MPH on the interstate and towing a loaded trailer, the vehicle experienced reduced braking performance. No warning lights illuminated. The local dealer was contacted and informed that the brakes performed differently. Additionally, the dealer stated that the transmission was not downshifting. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 500.
Have been driving it on four separate occasions and the engine will start running rough and shut off leaving me with no power brakes or power steering. Once when I was going about 30 miles an hour the other three times when I was coming to a stop with a trailer on just took it in Kendall Chevrolet for the first time they are still working on it but unable to duplicate the problem this is a very serious safety concern for myself and possibly for others that have the same issue
Compare the 2026 GMC Sierra 3500
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Questions about the 2026 GMC Sierra 3500
Is the 2026 GMC Sierra 3500 reliable?
Owners have filed 5 complaints about the 2026 GMC Sierra 3500, fewer than a typical Sierra 3500 model year.
What is the most common problem with the 2026 GMC Sierra 3500?
Transmission and drivetrain, with 2 complaints. Next is wheels (2).
How many recalls does the 2026 GMC Sierra 3500 have?
2 recalls, covering fuel system, gasoline and equipment.
What year does the GMC Sierra 3500 have bad transmission?
The GMC Sierra 3500 model years with the most transmission complaints are 2020 (19 complaints), 2023 (14 complaints) and 2024 (13 complaints).
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