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

Durable Diesel Exhaust Fluid Filler Cap for Chevrolet and GMC

The Dorman 904-5601 Diesel Exhaust Fluid (DEF) Filler Cap is designed specifically for select Chevrolet and GMC heavy-duty trucks and vans. Constructed from durable blue plastic, this DEF filler cap ensures a secure seal and reliable performance for your vehicle's emission control system.

• Made from high-quality blue plastic for durability and corrosion resistance
• Specific fitment for Chevrolet Express 2500/3500, GMC Savana 2500/3500, Sierra 2500 HD/3500 HD, and Silverado 2500 HD/3500 HD
• Includes keys and retention ring for secure installation and theft prevention
• Designed to maintain proper DEF system pressure and prevent contamination

Product Details and Specifications

The Dorman 904-5601 DEF filler cap is engineered to meet the exact specifications required by Chevrolet and GMC diesel vehicles. Its blue plastic housing is resistant to chemicals and environmental factors, helping to protect the Diesel Exhaust Fluid reservoir from dirt and moisture. This cap is a specific fit for models including the Chevrolet Express 2500 and 3500, GMC Savana 2500 and 3500, as well as heavy-duty trucks like the Sierra 2500 HD, Sierra 3500 HD, Silverado 2500 HD, and Silverado 3500 HD. The package includes keys and a retention ring, ensuring the cap remains securely fastened and reducing the risk of unauthorized access or accidental spillage.

Common Applications and Problem Solving

• Replaces lost or damaged DEF filler caps on compatible Chevrolet and GMC diesel vehicles
• Prevents DEF fluid contamination from dirt, debris, and moisture
• Helps maintain proper DEF system pressure to ensure emission compliance
• Reduces risk of DEF fluid evaporation or leakage
• Secures DEF reservoir with included keys and retention ring

Installation Notes and Tips

Installation of the Dorman 904-5601 DEF filler cap is straightforward and requires no special tools beyond the included keys. Ensure the old cap is fully removed and the filler neck is clean before installing the new cap. Align the cap properly and twist until it locks into place. Use the provided keys to lock or unlock the cap as needed. Regular inspection of the cap and retention ring is recommended to maintain a secure seal and prevent DEF system issues.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 904-5601 DEF filler cap undergoes quality checks to ensure durability and reliable performance in emission control applications. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to Dorman’s official warranty policy for complete information.