Shop Genuine 2020 GMC Sierra 2500 HD Parts
Select The Trim & Engine Of Your Vehicle Below
Getting parts right on a heavy duty pickup starts with knowing which generation you are working on. GMT900 HD through 2014, K2XX HD from 2015 to 2019, and the T1XX HD from 2020.
2020 is a carryover year for this vehicle. That makes sourcing simpler in the mechanical systems and no simpler at all in trim and body. GM made running changes mid-year on several heavy duty components, so the correct part can depend on build date rather than model year alone.
The parts we ship most for the 2020 GMC Sierra 2500 HD are steering linkage and drag links, brake rotors and calipers, turbo and charge air components, fuel injectors and lines and glow plugs and controllers. Everything on this page is a factory GM part, built to the original specification and carrying the original part number. On a heavy duty pickup these are the components that carry load and heat, and they are where an aftermarket substitute costs you the job twice.
Body and exterior parts are where fitment errors get expensive, because a panel that is close but not correct will not line up with the panels around it. Confirm those against the VIN before ordering rather than after.
If you are not certain which version you have, give us the VIN and we will confirm fitment before you check out. In stock orders placed by 3pm Central typically leave our Dallas warehouse the same day, so most of the country sees short transit times. Cross-shopping a related truck? The 2020 GMC Sierra 1500 is the closest thing in the lineup that year.