GMC Sierra 2500HD Problems: 5 Issues Every Owner Should Know
2011-2025 model years ยท 2,880+ owner reports ยท Updated April 2026
According to Au7o's analysis of 2,880+ owner reports, the 2011-2025 GMC Sierra 2500HD has 5 documented known issues, with 4 rated critical. The most serious are CP4.2 High-Pressure Fuel Pump Catastrophic Failure ($8,000-$18,000 repair), LML Duramax EGR Cooler and EGR Valve Failure ($1,200-$3,500 repair), Allison 1000/2000 Transmission TCM Failure and Harsh Shifting ($300-$4,500 repair) and 6.0L V8 Excessive Oil Consumption and AFM Lifter Wear ($400-$7,000 repair). The most commonly reported issue is CP4.2 High-Pressure Fuel Pump Catastrophic Failure with 920 owner reports. Across all issues, repair costs range from $300 to $18,000. DIY maintenance guides at au7o.io.