Used and remanufactured engines that fit the 2021 GMC Sierra 2500. Each unit below is matched to this vehicle, warranty-backed, and shipped with freight quoted at checkout from EP Engines.
Rule of thumb: a engine replacement is usually worth it when the installed cost stays under 45% of what the 2021 GMC Sierra 2500 is worth — most units below beat that comfortably.
As a general rule of thumb, an engine replacement on a 2021 GMC Sierra 2500 (full-size truck segment, vehicle value roughly $17,571–$22,363) is usually worth it when the installed cost stays under about $8,985 — roughly 45% of what the vehicle is worth.
Based on vendor-verified fitment data across 8 listed engines, remanufactured and new engines for this model cover the 1999–2004 model years. Always confirm your exact VIN or engine/transmission code before ordering, since fitment can vary by submodel or engine.
