While many aspects of the 6.6-liter Duramax diesel are highly praised, many owners have experienced trouble with the fuel pump and EGR system. These issues have occurred across the GMC Sierra ...
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CP4 Pump: Which Diesel Engines Use It And Why Is It So Problematic?Starting in 2011, Ford and General Motors began using Bosch Mobility CP4 pumps to provide high pressure fuel to their diesel engines. GM used the pump on its 6.6-liter LGH and LML Duramax diesel ...
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