2024 GMC Sierra 3500HD Problems: 4 Known Issues
2024 model year · 120+ owner reports · Updated November 2026
According to Au7o's analysis of 120+ owner reports, the 2024 GMC Sierra 3500HD has 4 documented known issues, with 2 rated critical. The most serious are Power steering assist loss / reduced assist warnings (new body style) and Diesel Injector Failure Causing White Smoke and Rough Running ($600-$5,000 repair). The most commonly reported issue is Power steering assist loss / reduced assist warnings (new body style) with 120 owner reports. Across all issues with published estimates, repair costs range from $400 to $5,000. DIY maintenance guides at au7o.io.
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All 4 Known Issues
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Frequently Asked Questions
What are the most common GMC Sierra 3500HD problems?
According to Au7o's analysis of 120+ owner reports, the 2024 GMC Sierra 3500HD has 4 documented issues. The most frequently reported are: Power steering assist loss / reduced assist warnings (new body style), Diesel Injector Failure Causing White Smoke and Rough Running, Exhaust Manifold Cracking and Warping (Duramax L5P/LML). Of these, 2 are rated critical and should be addressed promptly.
Is the GMC Sierra 3500HD reliable?
The 2024 GMC Sierra 3500HD has 4 known issues documented across 120+ owner reports. 2 issues are rated critical: Power steering assist loss / reduced assist warnings (new body style) and Diesel Injector Failure Causing White Smoke and Rough Running. 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 3500HD problems?
Repair costs for known GMC Sierra 3500HD issues range from $400 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2020-2024 GMC Sierra 3500HD Power steering assist loss / reduced assist warnings (new body style)?
On 2020+ Sierra 3500HD (T1 platform) with GM's electronically controlled hydraulic Digital Steering Assist, owners report intermittent loss of steering assist and warning messages such as "Steering Assist Reduced". NHTSA complaints and GM service information commonly point to pow… Severity: high.
What is the 2015-2024 GMC Sierra 3500HD Diesel Injector Failure Causing White Smoke and Rough Running?
The fuel injectors on the Duramax LML (Bosch piezoelectric) and L5P (Denso solenoid) engines can fail due to contaminated fuel, high-mileage wear, or internal electrical faults. A failed injector causes white smoke on startup, rough idle, misfires on the affected cylinder, and fu… Repairs typically run $600-$5,000. Severity: high.
What is the 2011-2024 GMC Sierra 3500HD Exhaust Manifold Cracking and Warping (Duramax L5P/LML)?
The cast iron exhaust manifolds on the Duramax diesel engine are prone to cracking and warping due to extreme exhaust gas temperatures and thermal cycling. Cracks typically develop at the manifold-to-head mounting points, causing exhaust leaks that produce a ticking noise on cold… Repairs typically run $800-$2,500. Severity: medium.
What is the 2015-2024 GMC Sierra 3500HD Steering Gear Box Leak and Excessive Play?
The recirculating ball steering gear box on the Sierra 3500HD develops fluid leaks at the input shaft seal and sector shaft seal, leading to power steering fluid loss and increased steering play. The heavy-duty application and large tires accelerate wear on the steering box inter… Repairs typically run $400-$1,500. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.