Dorman 904-121 EGR Cooler

Dorman 904-121 EGR Cooler for Silverado and Sierra

Dorman 904-121 is a specific-fit exhaust gas recirculation cooler for select 2006-2007 Chevrolet Silverado and GMC Sierra heavy-duty trucks. It updates the original cooler design with spiral tubes to improve exhaust-gas cooling efficiency and reduce clogging in the EGR system.

• Specific fit for select Chevrolet Silverado 2500 HD, Silverado 3500, Silverado 2500 HD Classic, and Silverado 3500 Classic applications
• Specific fit for select GMC Sierra 2500 HD, Sierra 3500, Sierra 2500 HD Classic, and Sierra 3500 Classic applications
• Stainless steel construction with a silver finish
• CARB certified with Executive Order D740
• Includes gasket and seal components for the listed application
• Package contents: 1 EGR cooler, 4 gaskets, 4 hose clamps, and 2 hoses

OE-Style Update for EGR Cooling

This Dorman OE FIX EGR cooler is engineered for vehicles that originally used a fin-style cooler prone to clogging. The spiral-tube design is intended to maintain efficient exhaust gas cooling while reducing buildup that can restrict flow and affect EGR operation. For buyers searching for a 2006 Chevrolet Silverado 2500 HD EGR cooler or a 2007 GMC Sierra 3500 Classic EGR cooler, Dorman 904-121 provides a direct replacement solution for the listed trucks. This part cross-references Standard Ignition ECK4 for the same application.

What It Can Help Address

• EGR cooler clogging from soot and deposits
• Restricted exhaust gas flow through the cooler
• Cooling performance loss in the EGR circuit
• Check engine light concerns related to EGR system faults
• Replacement needs on select Silverado and Sierra diesel applications

Installation Notes and Fitment

Compatible With 2006 Chevrolet Silverado 2500 HD, 2006 Chevrolet Silverado 3500, 2006 GMC Sierra 2500 HD, 2006 GMC Sierra 3500, 2007 Chevrolet Silverado 2500 HD Classic, 2007 Chevrolet Silverado 3500 Classic, 2007 GMC Sierra 2500 HD Classic, and 2007 GMC Sierra 3500 Classic. Verify engine and emissions configuration against the vehicle before installation. Use the included gaskets, hoses, and clamps as specified for the application, and inspect mating surfaces and related EGR components for carbon buildup or wear during service.

Quality Assurance

Dorman 904-121 is built from stainless steel and is CARB certified under Executive Order D740 for the listed applications. It is designed as a direct-fit replacement for specific vehicles and follows an OE-style update to address a known clogging issue in the original cooler design.