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 ...

If you browse forums often, chances are you've come across some heated discussions around the CP4 fuel pump. The CP4, short for "Common Rail Pump 4," is a high-pressure fuel injection pump that ...

Per the lawsuit, the Bosch CP4 fuel pumps fail from the use of American diesel fuel because the pumps are too fragile to manage U.S. diesel. As such, the plaintiffs claim that the pumps generate ...

Plaintiffs in the class action lawsuit claim the part, known as the CP4 pump, was “unreasonably fragile and prone to catastrophic failure.” When parts of the pump rub against each other ...

13, 2024. To be eligible, owners must have purchased a 2011–2016 Chevrolet Silverado or GMC Sierra with a 6.6L Duramax diesel engine and a Bosch CP4 high-pressure fuel pump from a GM ...

The pumps were said to create metal debris, which could severely damage the fuel system and cause engine shutdowns. Silverado and Sierra owners who paid out of pocket for CP4 repairs can receive ...

The settlement pertains to 2011-2016 Chevrolet Silverados and GMC Sierra diesel trucks equipped with 6.6L Duramax engines and Bosch “CP4” high-pressure diesel fuel pumps. According to a press ...

There are technically two versions of the CP4 pump, CP4.1 and CP4.2; however, they're typically referred to collectively as CP4. The difference being the CP4.1 pumps contain a single pumping ...