Buy 2011 Gmc Sierra 2500 HD SLT Crew Cab Pickup 6.6L Duramax V8 DIESEL A/T RWD Exhaust Gas - OEM Gmc Part # 12635704

Exhaust Gas Recirculation (EGR) Cooler.
A heat exchanger that Cools Exhaust Gases as they are recirculated back into the engine.

EGR Cooler

Fits Express 2500, Express 3500, Savana 2500, Savana 3500, Sierra 2500 HD, Sierra 3500 HD, Silverado

6.6 LITER DIESEL, EGR VALVE & RELATED COMPONENTS, rear. Express, Savana; 6.6L Diesel; w/Dual Turbo. Silverado, Sierra; 6.6L; Rear.
EGR Valve Cooler - Repair or Replace
A failed EGR valve cooler in your 2011 GMC Sierra 2500 HD will often have no noticeable symptoms beyond a check engine light, but it does cause your vehicle to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and GMC genuine parts.