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General Motors Use of CP4 Diesel Fuel Pumps California Class Action

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2016 Silverado Truck

This California class action is at least the third complaint filed against an automobile manufacturer concerning the Bosch CP4 diesel fuel pump. A long list of plaintiffs files this complaint against General Motors (GM), alleging that the fuel pump was a “ticking time bomb” that simply cannot operate properly with American diesel fuel standards, leading to abrupt and potentially dangerous shutoff of the vehicle’s engine.

The complaint claims that, “although complete and total pump failure takes time to occur, the defective CP4 pump starts damaging the vehicle’s fuel injection system and engine immediately upon the vehicle’s first use.” This is because Bosch designed the CP4 fuel pump for European use. 

But American diesel fuel is cleaner, and provides less lubrication. The complaint says, “When American diesel fuel is run through the fast moving, high pressure, lower volume CP4 pump, it struggles to maintain lubrication. The cleaner, thinner diesel allows air pockets to form inside the pump during operation, causing metal to rub against metal, generating metal shavings which are dispersed throughout the fuel injection system, contaminating and destroying the fuel system and indeed the entire engine.” 

Eventually, the engine fails, requiring repairs that cost from $8,000 to $20,000.

The complaint says GM advertises its diesel vehicles as having improvements in torque, horsepower, durability, and fuel economy. But GM knew years ago that the fuel pump was problematic in US vehicles, the complaint says: “By 2002, the Truck & Engine Manufacturers Association … acknowledged that the lower lubricity of American diesel could cause catastrophic failure in fuel injection system components that are made to European diesel specifications.”

What’s worse, the complaint says, is that GM attempts to blame the engine failures on the vehicles’ owners, claiming that the failures are the result of their use of contaminated or substandard fuel.

The complaint alleges fraud by concealment, violations of California’s Unfair Competition Law and Consumer Legal Remedies Act, and breaches of warranties, among other things.

The class for this action is all persons or entities in California who are current owners or lessees, or former owner or lessees, who had expenses related to engine or fuel pump repair for the following vehicles:

  • 2011–2016 2500HD Silverado 6.6L V8 Duramax Diesel Trucks with LML engines; 
  • 2011–2016 3500HD Silverado 6.6L V8 Duramax Diesel Trucks with LML engines; 
  • 2011–2016 2500HD Sierra 6.6L V8 Duramax Diesel Trucks with LML engines; 
  • 2011–2016 3500HD Sierra 6.6L V8 Duramax Diesel Trucks with LML engines; 
  • 2010–2011 Chevrolet Express van with Duramax LGH engines; 
  • 2010–2011 GMC Savana van with Duramax LGH engines; 
  • 2010–2011 GMC Sierra trucks with RPO ZW9 (chassis cabs or trucks with pickup box delete) with Duramax LGH engines; 
  • 2011–2012 2500HD 3500 Silverado 6.6L V8 Duramax Diesel Trucks with LGH engines; and 
  • 2011–2012 2500HD 3500 Sierra 6.6L V8 Duramax Diesel Trucks with LGH engines. 
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