<p>Includes: - Relay for GMC Sierra 2500 HD</p> <p>Fits Models: - GMC Sierra 2500 HD</p> <p>Model Years: - 2001–2006, 2020–2025</p> <p>Submodels: - Common trims include WT (Work Truck), SLE, SLT, Denali; body styles are Crew Cab, Extended Cab, Regular Cab; chassis codes are GMT800 (2001–2006) and GMT900 (2020–2025).</p> <p>Engine Options: - Common engine sizes include 6.0L V8 (LQ4), 6.6L Duramax Diesel (LB7, LMM), and 5.3L V8 (LM7); engine codes may vary by year.</p> <p>Description: This relay is designed for the GMC Sierra 2500 HD, ensuring reliable electrical connections for various vehicle systems. It is compatible with both the earlier and newer model years, providing versatility for repairs and replacements.</p> <p>Features: - Direct fit for GMC Sierra 2500 HD models - High-quality construction for durability - Easy installation with no modifications required - Compatible with multiple engine options - Ensures optimal performance of electrical systems</p> <p>Part Numbers: - 66852SXMS</p>