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Chevrolet · Known Issues

1991 Chevrolet C/K 1500 Problems: 3 Known Issues

1991 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 1991 Chevrolet C/K 1500 has 3 documented known issues. None of the listed issues is rated critical; this is not a complete reliability assessment. Across all issues with published estimates, repair costs range from $20 to $900. DIY maintenance guides at au7o.io.

In This Article

  • C/K 1500 Engine1
  • C/K 1500 Electrical1
  • C/K 1500 Fuel System1
  • FAQ
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In This Article

  • Engine1
  • Electrical1
  • Fuel System1
  • FAQ

All 3 Known Issues

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ALL YEARS19981997199619951994199319921991199019891988

On the 1988-1998 Chevrolet C/K 1500, the oil pressure sender on C/K 1500 trucks (especially 5.0L and 5.7L V8s) fails frequently, showing false low-pressure or erratic readings. The sensor can also leak oil through its electrical connector. Aftermarket replacement sensors often have shorter lifespans (60-90k miles). The issue is worse on high-mileage trucks where heat cycling degrades the sensor diaphragm.

This issue also affects: Chevrolet Express

Common Symptoms

  • Oil pressure gauge reading zero or erratic at idle
  • Low oil pressure warning light flickering
  • Oil leaking from sensor connector
  • Gauge bouncing at different RPMs
  • No unusual engine noise despite zero reading

How to Fix

Typical repair cost:$30 - $200

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Community Reported
Medium Confidence

On the 1988-1995 Chevrolet C/K 1500, the speedometer on 1988-1995 C/K trucks uses a mechanical cable and nylon drive gear that wears out. The nylon gear teeth round off or the retaining clip falls off, causing the gear to freewheel. Later models (1992+) with electronic speedometers suffer from Vehicle Speed Sensor (VSS) and DRAC module failures causing intermittent or dead speedometer readings.

Common Symptoms

  • Speedometer not working or reading intermittently
  • Speedometer works when dashboard is struck
  • Odometer stops counting miles
  • Transmission may not shift properly (linked to VSS)
  • Cruise control inoperative

How to Fix

Typical repair cost:$20 - $300

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On the 1990-1998 Chevrolet C/K 1500, the in-tank electric fuel pump fails frequently on C/K trucks, especially in hot weather. Low fuel levels accelerate pump failure as the fuel cools and lubricates the pump. The pump module sender unit also fails, causing inaccurate fuel gauge readings.

This issue also affects: Chevrolet Blazer, Chevrolet Express, Chevrolet S-10

Common Symptoms

  • Engine stalling
  • Hard starting
  • Loss of power at highway speeds
  • Whining from fuel tank
  • Inaccurate fuel gauge

How to Fix

Confirm low fuel pressure before replacing parts by testing pressure at the TBI or CPI rail and checking pump current draw, fuel pump relay operation, wiring at the tank connector, and frame ground integrity. If pressure is below spec or the pump is noisy/intermittent, replace the complete in-tank fuel pump module/sender assembly rather than the pump alone, install a new fuel strainer and external fuel filter, and inspect the tank for contamination or overheating damage to the harness connector. Because sender failure is common, replacing the full module usually restores both fuel delivery and gauge accuracy; typical parts cost is about $100-$300 for an aftermarket module or $250-$450 for higher-quality/OE-style parts, with total installed cost commonly $400-$900 depending on bed removal vs. tank drop labor.

Typical repair cost:$400 - $900

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Frequently Asked Questions

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

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1991 Chevrolet C/K 1500 has 3 documented issues. The most frequently reported are: Oil Pressure Sensor/Sending Unit Failure, Speedometer Cable and Drive Gear Failure, In-Tank Fuel Pump Failure. None are rated critical, but regular maintenance is recommended.

Is the Chevrolet C/K 1500 reliable?

The 1991 Chevrolet C/K 1500 has 3 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Chevrolet C/K 1500 problems?

Repair costs for known Chevrolet C/K 1500 issues range from $20 to $900, 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 1988-1998 Chevrolet C/K 1500 Oil Pressure Sensor/Sending Unit Failure?

The oil pressure sender on C/K 1500 trucks (especially 5.0L and 5.7L V8s) fails frequently, showing false low-pressure or erratic readings. The sensor can also leak oil through its electrical connector. Aftermarket replacement sensors often have shorter lifespans (60-90k miles). Repairs typically run $30-$200. Severity: medium.

What is the 1988-1995 Chevrolet C/K 1500 Speedometer Cable and Drive Gear Failure?

The speedometer on 1988-1995 C/K trucks uses a mechanical cable and nylon drive gear that wears out. The nylon gear teeth round off or the retaining clip falls off, causing the gear to freewheel. Later models (1992+) with electronic speedometers suffer from Vehicle Speed Sensor (… Repairs typically run $20-$300. Severity: medium.

What is the 1990-1998 Chevrolet C/K 1500 In-Tank Fuel Pump Failure?

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.

The in-tank electric fuel pump fails frequently on C/K trucks, especially in hot weather. Low fuel levels accelerate pump failure as the fuel cools and lubricates the pump. The pump module sender unit also fails, causing inaccurate fuel gauge readings. Repairs typically run $400-$900. Severity: medium.