GMC · Known Issues

2024 GMC Sierra 3500HD Problems: 5 Issues Every Owner Should Know

2024 model year · 120+ owner reports · Updated June 2026

According to Au7o's analysis of 120+ owner reports, the 2024 GMC Sierra 3500HD has 5 documented known issues, with 3 rated critical. The most serious are Electric power steering (EPS) assist loss / reduced assist warnings (new body style), Diesel Injector Failure Causing White Smoke and Rough Running ($600-$5,000 repair) and Rear Leaf Spring Breakage Under Heavy Loads ($400-$1,500 repair). The most commonly reported issue is Electric power steering (EPS) 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.

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 5 documented issues. The most frequently reported are: Electric power steering (EPS) assist loss / reduced assist warnings (new body style), Diesel Injector Failure Causing White Smoke and Rough Running, Rear Leaf Spring Breakage Under Heavy Loads. Of these, 3 are rated critical and should be addressed promptly.

Is the GMC Sierra 3500HD reliable?

The 2024 GMC Sierra 3500HD has 5 known issues documented across 120+ owner reports. 3 issues are rated critical: Electric power steering (EPS) assist loss / reduced assist warnings (new body style) and Diesel Injector Failure Causing White Smoke and Rough Running and Rear Leaf Spring Breakage Under Heavy Loads. 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 Electric power steering (EPS) assist loss / reduced assist warnings (new body style)?

On 2020+ Sierra 3500HD (T1 platform) with electric power steering, owners report intermittent loss of steering assist and warning messages such as "Steering Assist Reduced". NHTSA complaints and GM service information commonly point to EPS module/software issues, wiring/connector… Severity: high.

What is the 2015-2024 GMC Sierra 3500HD Diesel Injector Failure Causing White Smoke and Rough Running?

The Bosch piezoelectric fuel injectors on the Duramax L5P and LML 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 fuel dilution of the… Repairs typically run $600-$5,000. Severity: high.

What is the 2015-2024 GMC Sierra 3500HD Rear Leaf Spring Breakage Under Heavy Loads?

The rear leaf spring packs on the Sierra 3500HD are prone to breaking or cracking under sustained heavy loads, particularly when used for frequent towing, hauling, or with fifth-wheel hitches. The main leaf or secondary leaves fracture at the spring eye or center bolt area. Broke… Repairs typically run $400-$1,500. Severity: high.

What is the 2015-2024 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.

2024 GMC Sierra 3500HD Problems: 5 Issues Every Owner Should Know

All 5 Known Issues

2020-2024 GMC Sierra 3500HD: Electric power steering (EPS) assist loss / reduced assist warnings (new body style)#

Common Symptoms

How to Fix

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2015-2024 GMC Sierra 3500HD: Diesel Injector Failure Causing White Smoke and Rough Running#

Common Symptoms

How to Fix

Owner tips & cautions

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2015-2024 GMC Sierra 3500HD: Rear Leaf Spring Breakage Under Heavy Loads#

Common Symptoms

How to Fix

Owner tips & cautions

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2015-2024 GMC Sierra 3500HD: Exhaust Manifold Cracking and Warping (Duramax L5P/LML)#

Common Symptoms

How to Fix

Owner tips & cautions

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2015-2024 GMC Sierra 3500HD: Steering Gear Box Leak and Excessive Play#

Common Symptoms

How to Fix

Owner tips & cautions

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Other GMC Models

Frequently Asked Questions

What are the most common GMC Sierra 3500HD problems?

Is the GMC Sierra 3500HD reliable?

How much does it cost to fix common GMC Sierra 3500HD problems?

What is the 2020-2024 GMC Sierra 3500HD Electric power steering (EPS) assist loss / reduced assist warnings (new body style)?

What is the 2015-2024 GMC Sierra 3500HD Diesel Injector Failure Causing White Smoke and Rough Running?

What is the 2015-2024 GMC Sierra 3500HD Rear Leaf Spring Breakage Under Heavy Loads?

What is the 2015-2024 GMC Sierra 3500HD Exhaust Manifold Cracking and Warping (Duramax L5P/LML)?

What is the 2015-2024 GMC Sierra 3500HD Steering Gear Box Leak and Excessive Play?