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1999 GMC Sierra 2500HD Problems: 1 Known Issue

1999 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1999 GMC Sierra 2500HD has 1 documented issue, with 1 rated critical. The most serious is Brake Line Corrosion and Rupture on GMT800 Trucks in Road-Salt States ($400-$1,500 repair). Across all issues with published estimates, repair costs range from $400 to $1,500. DIY maintenance guides at au7o.io.

In This Article

  • Sierra 2500HD Brakes1
  • FAQ
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In This Article

  • Brakes1
  • FAQ

All 1 Known Issue

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On the 1999-2003 GMC Sierra 2500HD, the steel brake pipes routed along the frame rails of 1999-2003 Sierra 2500/2500HD trucks corrode from the outside in where road salt, debris and moisture collect against them. The line eventually perforates and dumps hydraulic pressure, giving the driver a pedal that sinks to the floor with little or no braking on the affected circuit. NHTSA opened an investigation (PE10-010, later upgraded to engineering analysis EA11-001) covering roughly six million 1999-2003 GM full-size trucks and SUVs and received 890 consumer complaints, 761 of them from salt-belt states. The agency closed the probe in April 2015 without ordering a recall, advising owners instead to wash the undercarriage - which means there is no free remedy and this remains an owner-paid inspection item.

Common Symptoms

  • Brake pedal sinking toward the floor
  • Sudden loss of braking on one circuit
  • Brake warning lamp
  • Brake fluid loss with visible wet spots or drips at the frame rail
  • Rust flaking along the brake pipes

How to Fix

There is no recall. Have the brake lines inspected on any salt-belt truck of this era, particularly along the frame rail and over the rear axle. Replace corroded sections with pre-bent stainless or nickel-copper (NiCopp) lines rather than plain steel - patching one leaking section on a rusted system usually just moves the failure. Wash the underbody regularly through winter as NHTSA advised.

Typical repair cost:$400 - $1,500

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Frequently Asked Questions

What are the most common GMC Sierra 2500HD problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1999 GMC Sierra 2500HD has 1 documented issue. The documented issue is: Brake Line Corrosion and Rupture on GMT800 Trucks in Road-Salt States. Of these, 1 is rated critical and should be addressed promptly.

Is the GMC Sierra 2500HD reliable?

The 1999 GMC Sierra 2500HD has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Brake Line Corrosion and Rupture on GMT800 Trucks in Road-Salt States. 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 $400 to $1,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Brake Line Corrosion and Rupture on GMT800 Trucks in Road-Salt States, typically costs $400-$1,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 1999-2003 GMC Sierra 2500HD Brake Line Corrosion and Rupture on GMT800 Trucks in Road-Salt States?

The steel brake pipes routed along the frame rails of 1999-2003 Sierra 2500/2500HD trucks corrode from the outside in where road salt, debris and moisture collect against them. The line eventually perforates and dumps hydraulic pressure, giving the driver a pedal that sinks to th… Repairs typically run $400-$1,500. Severity: high.

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.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.