Dorman 904-632 Diesel Exhaust Fluid (DEF) Heater

Dorman 904-632 DEF Heater for Silverado and Sierra

Dorman 904-632 is a diesel exhaust fluid heater built for specific GM heavy-duty diesel applications. It addresses a common factory failure point caused by fluid intrusion and updates the original design to improve reliability in service.

Key Features

• OE FIX design that revises the factory DEF heater layout to reduce intrusion-related failure
• Specific fit for 2010-2011 Chevrolet Silverado 2500 HD and Silverado 3500 HD with level sensor
• Specific fit for 2010-2011 GMC Sierra 2500 HD and Sierra 3500 HD with level sensor
• Plastic housing with black finish
• Electronic level sensor type
• Female electrical connector with 2 connector terminals and 2 electrical connector quantities listed
• O-ring inlet and outlet fittings for direct replacement-style installation
• Mounting hardware included
• Compatible with OE cross-reference applications including Bosch F01C600335 and Spectra Premium EM1206URH

Detailed Description

This Dorman DEF heater, part number 904-632, is engineered for diesel exhaust fluid system service on 2010-2011 Chevrolet Silverado 2500 HD, 2010-2011 Chevrolet Silverado 3500 HD, 2010-2011 GMC Sierra 2500 HD, and 2010-2011 GMC Sierra 3500 HD models equipped with a level sensor. The design updates the original factory configuration to address a known intrusion-related failure mode, helping restore DEF heating function in the tank assembly. The unit uses a plastic housing, O-ring inlet and outlet connections, and an electronic level sensor interface for a direct-fit repair on the listed GM trucks.

This part number 904-632 also cross-references Bosch F01C600335 and Spectra Premium EM1206URH for the same application.

Common Problems This Part Can Address

• DEF heater failure from fluid intrusion
• Loss of DEF heating in cold-weather operation
• DEF system warning lights related to heater malfunction
• Improper DEF tank temperature control
• Service issues on Silverado and Sierra HD diesel emission systems

Installation Notes and Tips

Verify the vehicle is one of the listed 2010-2011 Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, or Sierra 3500 HD applications with a level sensor before installation. Confirm connector style, O-ring sealing surfaces, and mounting points match the original unit. Inspect the DEF tank assembly for contamination or damage that could affect the new heater’s performance. Part number 904-632 is a specific-fit component, so compare the original heater and electrical connections before service.

Quality Assurance

Dorman OE FIX parts modify known weak points in original equipment designs to improve service reliability while maintaining application-specific fitment for the listed Chevrolet Silverado and GMC Sierra HD trucks.