2020 GMC Sierra 2500HD V (GMTT1XX) Double Cab Standard Bed: Duramax 6.6L HD engine under hood with fluid reservoirs in engine bay

Close-up of a heavy-duty diesel engine with Duramax 6.6L HD branding, showing fluid reservoirs, wiring, and engine components inside the under-hood compartment.

View Dimensions of the 2020 GMC Sierra 2500HD V (GMTT1XX) Double Cab Standard Bed

View 25 images of the 2020 GMC Sierra 2500HD V (GMTT1XX) Double Cab Standard Bed

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