Dorman 904-5601 Diesel Exhaust Fluid (DEF) Filler Cap

DEF Filler Cap for GM Diesel Applications

This Dorman DEF filler cap is a specific-fit replacement for select Chevrolet and GMC diesel vehicles. Built from plastic with a blue housing color, it matches the original cap’s fit and function for dependable sealing and everyday service.

Part number 904-5601 is designed for owners replacing a damaged, missing, or worn diesel exhaust fluid cap on Chevrolet Express, GMC Savana, Silverado HD, and Sierra HD models.

Key Features

• Specific-fit DEF filler cap for select GM diesel applications
• Plastic construction for durable, lightweight service
• Blue housing color for OE-style appearance
• Includes keys and retention ring
• Direct replacement for part number 904-5601
• Cross-reference: 572.3007, 22753134

Detailed Description

Dorman 904-5601 is a diesel exhaust fluid filler cap engineered to match the original cap on specified vehicles. It is built to restore proper DEF tank closure and maintain the intended fit on compatible Chevrolet and GMC diesel models. This replacement is a practical choice for service work on 2010-2021 Chevrolet Express 2500 and Express 3500, 2010-2021 GMC Savana 2500 and Savana 3500, and 2010-2019 Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and Sierra 3500 HD.

What This Part Helps Address

• Broken or cracked DEF filler cap
• Missing cap at the diesel exhaust fluid fill point
• Worn cap that no longer seats correctly
• DEF tank opening exposed to contamination
• Service issues caused by an incorrect replacement cap

Installation Notes and Tips

Verify vehicle year, make, and model before ordering. This is a specific-fit part, so confirm the DEF fill opening matches the original cap design on your Chevrolet Express, GMC Savana, Silverado HD, or Sierra HD. Inspect the sealing surface and surrounding fill area before installation to ensure proper closure.

Quality Assurance

Dorman designs this DEF filler cap to match OE fit and function on listed applications and to provide reliable performance in diesel service. The part number 904-5601 is built for durability and consistent replacement use.