Dorman 904-138 Fuel Injection Harness

Dorman 904-138 Fuel Injector Harness

This Dorman fuel injection harness is a standard replacement for restoring injector circuit function on select GM trucks. It is built to match the original harness fit and electrical operation, with insulated connectors that help resist corrosion in demanding engine-bay conditions.

• Direct replacement fuel injector harness for OE-style fit and function
• Fits 2004-2005 Chevrolet Silverado 2500 HD, cylinders 2 and 7
• Fits 2004-2005 Chevrolet Silverado 3500, cylinders 2 and 7
• Fits 2004-2005 GMC Sierra 2500 HD, cylinders 2 and 7
• Fits 2004-2005 GMC Sierra 3500, cylinders 2 and 7
• 10-inch harness length with 4-wire construction
• Male plug/connector type with heat shield
• Controls 2 fuel injectors

Detailed Product Overview

Dorman 904-138 is a replacement fuel injector harness for 2004-2005 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 applications listed for cylinders 2 and 7. It is made as a standard replacement part to restore proper injector system operation when the original harness is damaged, corroded, or no longer maintaining a reliable electrical connection. The insulated electrical connectors are designed to help reduce corrosion at the connection points, while the integrated heat shield adds protection in high-temperature engine areas. This part cross-references OE-style replacement number 98017958 for the same application.

Common Problems This Part Can Address

• Intermittent injector signal caused by damaged wiring
• Corrosion at injector connector terminals
• Heat-related harness deterioration near the engine
• Rough running from poor injector electrical contact
• Injector circuit faults affecting cylinders 2 and 7

Installation Notes and Tips

Verify the vehicle application by year, make, model, and cylinder location before installation. Inspect the injector connectors, routing path, and nearby wiring for heat damage or abrasion before replacing the harness. Confirm secure connector engagement and proper harness routing away from hot or moving components after installation. Dorman 904-138 is a direct-fit replacement intended for the listed GM truck applications.

Quality Assurance

Dorman manufactures this harness as a standard replacement component to match OE fit and function. The insulated connectors and heat shield support dependable electrical connection performance in the engine compartment.