2026 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2026 GMC Sierra 3500HD has 2 documented known issues, with 2 rated critical. The most serious are Electronic Owner-Manual Download Recall and Dual-Tank Fuel-Transfer Software Recall. DIY maintenance guides at au7o.io.
Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2026 GMC Sierra 3500HD has 2 documented issues. The most frequently reported are: Electronic Owner-Manual Download Recall, Dual-Tank Fuel-Transfer Software Recall. Of these, 2 are rated critical and should be addressed promptly.
The 2026 GMC Sierra 3500HD has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 2 issues are rated critical: Electronic Owner-Manual Download Recall and Dual-Tank Fuel-Transfer Software Recall. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
NHTSA campaign 26V114 covers certain 2026 GMC Sierra 3500HD trucks. The radio may not be configured to download the electronic owner manual, violating the federal occupant-protection information requirement. Severity: high.
NHTSA campaign 26V129 covers certain 2025-2026 gasoline GMC Sierra 3500HD trucks with dual fuel tanks. The rear pump may not transfer enough fuel to the front tank, causing an engine stall. Severity: high.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
