2012 GMC Sierra 2500 HD Parts and Accessories
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.
The parts we ship most for the 2012 GMC Sierra 2500 HD are water pumps and thermostats, exhaust manifolds, transfer case components, fifth wheel and gooseneck hardware and trailer brake controllers. Every part listed here is a genuine GM component with the factory part number, not an aftermarket reproduction. 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.
Fitment questions account for roughly a quarter of the OEM orders we handle, and almost all of them trace back to the same cause: one vehicle, several nearly identical parts, one correct answer. The VIN resolves it every time.
The 2012 Sierra 2500 HD sits mid-run, which usually means the parts catalog was settled, but option packages and trim still split part numbers within the model year. Heavy duty trucks split on cab and chassis configuration, single versus dual rear wheels, and gas versus diesel, and the catalog will often show several options for the same nominal part.
Send us your VIN before you order and our parts specialists will confirm the exact part number for your vehicle. Orders placed by 3pm Central usually ship the same business day from our Dallas warehouse, which keeps transit times short across most of the country. Parts for the 2011 Sierra 2500 HD and the 2013 Sierra 2500 HD are listed separately, because the differences between adjacent years are real.