Collection: 2020-2026 GMC Sierra 3500HD Tuners, Modules & Monitors

Performance tuners, modules, and monitors built for the 2020-2026 GMC Sierra 3500HD. Covers both the 6.6L L8T gas V8 and the L5P Duramax diesel, with options from Edge, Bully Dog, Banks, and EZ Lynk.

Will a tuner void my Sierra 3500HD powertrain warranty? Yes, GM can deny powertrain claims tied to ECM modifications, which is why we stock CARB-compliant and 50-state-legal monitor-only options that read data without flashing the ECU.

Verified fitment on every listing -- no guesswork at checkout.