GMC Sierra 2500HD Problems: 5 Issues Every Owner Should Know

What are the most common GMC Sierra 2500HD problems?

According to Au7o's analysis of 2,880+ owner reports, the 2011-2025 GMC Sierra 2500HD has 5 documented issues. The most frequently reported are: CP4.2 High-Pressure Fuel Pump Catastrophic Failure, LML Duramax EGR Cooler and EGR Valve Failure, Allison 1000/2000 Transmission TCM Failure and Harsh Shifting. Of these, 4 are rated critical and should be addressed promptly.

Is the GMC Sierra 2500HD reliable?

The 2011-2025 GMC Sierra 2500HD has 5 known issues documented across 2,880+ owner reports. 4 issues are rated critical: CP4.2 High-Pressure Fuel Pump Catastrophic Failure and LML Duramax EGR Cooler and EGR Valve Failure and Allison 1000/2000 Transmission TCM Failure and Harsh Shifting and 6.0L V8 Excessive Oil Consumption and AFM Lifter Wear. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common GMC Sierra 2500HD problems?

Repair costs for known GMC Sierra 2500HD issues range from $300 to $18,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, CP4.2 High-Pressure Fuel Pump Catastrophic Failure, typically costs $8,000-$18,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year GMC Sierra 2500HD is the most reliable?

Reliability varies across model years of the GMC Sierra 2500HD. Based on owner reports, issues are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2011-2025 GMC Sierra 2500HD with 5 documented issues from 2,880+ owner reports.

GMC Sierra 2500HD Problems: 5 Issues Every Owner Should Know

All 5 Known Issues

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Frequently Asked Questions

What are the most common GMC Sierra 2500HD problems?

Is the GMC Sierra 2500HD reliable?

How much does it cost to fix common GMC Sierra 2500HD problems?

What year GMC Sierra 2500HD is the most reliable?