What are the most common GMC C/K 1500 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1990 GMC C/K 1500 has 2 documented issues. The most frequently reported are: Steel Brake Line Corrosion and Failure, Oil Pressure Sending Unit Failure. Of these, 1 is rated critical and should be addressed promptly.

Is the GMC C/K 1500 reliable?

The 1990 GMC C/K 1500 has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Steel Brake Line Corrosion and Failure. 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 C/K 1500 problems?

Repair costs for known GMC C/K 1500 issues range from $30 to $600, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Steel Brake Line Corrosion and Failure, typically costs $200-$600 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 1990-1998 GMC C/K 1500 Steel Brake Line Corrosion and Failure?

Factory steel brake lines corrode from road salt exposure, especially along the frame rails where debris traps moisture. Corroded lines can burst under braking pressure, causing sudden loss of braking on one or both circuits. Repairs typically run $200-$600. Severity: high.

What is the 1988-1998 GMC C/K 1500 Oil Pressure Sending Unit Failure?

Same oil pressure sensor issue as Chevrolet C/K 1500. The sending unit fails, giving false zero or erratic oil pressure readings. Oil can leak through the electrical connector. Aftermarket sensors have shorter service life. Always verify actual oil pressure with a mechanical gaug… Repairs typically run $30-$200. Severity: medium.

GMC · Known Issues

1990 GMC C/K 1500 Problems: 2 Known Issues

1990 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1990 GMC C/K 1500 has 2 documented known issues, with 1 rated critical. The most serious is Steel Brake Line Corrosion and Failure ($200-$600 repair). Across all issues with published estimates, repair costs range from $30 to $600. DIY maintenance guides at au7o.io.

1990 GMC C/K 1500 Problems: 2 Known Issues

All 2 Known Issues

1990-1998 GMC C/K 1500: Steel Brake Line Corrosion and Failure#

Common Symptoms

How to Fix

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1988-1998 GMC C/K 1500: Oil Pressure Sending Unit Failure#