--- title: "Class-Action status granted for lawsuit over defective GM CP4 fuel pumps" url: "https://pickuptrucktalk.com/2023/05/class-action-status-gm-defective-fuel-pumps/" publisher: "Pickup Truck + SUV Talk" content_signal: "search=yes, ai-input=yes, ai-train=no" author: "Tim Esterdahl" published: "2023-05-11T18:12:54+00:00" modified: "2025-07-23T15:12:05+00:00" image: "https://pickuptrucktalk.com/wp-content/uploads/2023/05/Chevrolet-Silverado-3500HD-Trailering.jpg" --- # Class-Action status granted for lawsuit over defective GM CP4 fuel pumps By Tim Esterdahl Published: 2023-05-11T18:12:54+00:00 Updated: 2025-07-23T15:12:05+00:00 ![Featured image]() A federal judge has granted class-action status in a lawsuit over defective GM CP4 fuel pumps. It accuses the automaker of knowingly selling diesel trucks equipped with this pump. The ruling comes as a significant victory for consumers, who claim that due to the defective [Bosch CP4 fuel pumps](), affected trucks with Duramax LGH Engines could experience catastrophic failure and lead owners to costly repair bills. ## **Fragile Design and Incompatibility with U.S. Diesel Fuel** Experts claim that the affected vehicles’ CP4 pump design is fragile and fundamentally flawed in several respects, and incompatible with diesel fuel sold in America. Due to the lack of proper lubrication in U.S. diesel, the fuel causes metal shavings to build up in the fuel system and engine, leading to unexpected total engine failure. ## **High Repair Costs and Inconvenience over GM CP4 fuel pumps** Repair costs range from $8,000-$20,000 and, since the “repair” consists of installing an identical replacement CP4 pump, still leaves owners with defective vehicles. Owners are, therefore, subject to the inconvenience of an unreliable vehicle, repair costs, and the potential safety hazard of unexpected engine failure. In addition to the costs of repair, owners are left with defective vehicles for which they overpaid or would not have purchased had they known about the defect. ## **Claims Upheld for Those Who Have Not Yet Experienced Defect** The court also upheld the claims of those owners who have not experienced the defect but have still been harmed through purchasing the defective vehicle. The order reads, “…even those who have not yet experienced a failure have adequately alleged they have been damaged by overpaying for their vehicles as a consequence of GM’s failure to disclose the problems with the CP4 pump.” “We are pleased with the court’s thoughtful analysis of the issues and look forward to continuing the case into discovery to fully uncover the exact extent of what GM knew when it chose to sell these defective diesel trucks,” said Steve Berman, managing partner at Hagens Berman. “We believe GM has greatly endangered the lives of many.” In outlining the claims addressed in the case, the order reads, “Plaintiffs intend to offer common proof—through testimony of GM engineers, internal testing data, and GM’s correspondence with Bosch—that GM knew of the alleged design defect even before it began production of class vehicles. They also intend to offer common proof—through testimony by GM employees, GM’s internal warranty data, GM’s instructions to dealerships, and marketing literature—that GM failed to disclose the design defect and actively concealed it even though class vehicles immediately began failing in the field.” Affected vehicles include: - [Chevrolet Silverado 2500HD]() 6.6L V8 Duramax Diesel with LML Engines, 2011–2016 - Chevrolet Silverado 2500HD 3500 6.6L V8 Duramax Diesel with LGH Engines, 2011–2012 - Chevrolet Silverado 3500HD 6.6L V8 Duramax Diesel with LML Engines, 2011–2016 - [GMC Sierra 2500HD]() 6.6L V8 Duramax Diesel with LML Engines, 2011–2016 - GMC Sierra 2500HD 3500 6.6L V8 Duramax Diesel with LGH Engines, 2011–2012 - GMC Sierra 3500HD 6.6L V8 Duramax Diesel Trucks with LML Engines, 2011–2016 - GMC Sierra with RPO ZW9 with Duramax LGH Engines, 2010–2011 Owners can find out more about this lawsuit [here](). ## **The bottom line** We have been following these class-action lawsuits closely about the notorious CP4 fuel pump and have heard many complaints from our audience. If you are affected, you understand the frustration and if you haven’t been affected, it truly seems like simply a matter of time until you will. ## Structured page information ~~~json [ { "@context": "https://schema.org", "@graph": [ { "@type": "Article", "@id": "https://pickuptrucktalk.com/2023/05/class-action-status-gm-defective-fuel-pumps/#article", "isPartOf": { "@id": "https://pickuptrucktalk.com/2023/05/class-action-status-gm-defective-fuel-pumps/" }, "author": { "name": "Tim Esterdahl", "@id": "https://pickuptrucktalk.com/#/schema/person/82b06f99329f69a069a5ab6caed18593" }, "headline": "Class-Action status granted for lawsuit over defective GM CP4 fuel pumps", "datePublished": "2023-05-11T18:12:54+00:00", "dateModified": "2025-07-23T15:12:05+00:00", "mainEntityOfPage": { "@id": "https://pickuptrucktalk.com/2023/05/class-action-status-gm-defective-fuel-pumps/" }, "wordCount": 585, "commentCount": 14, "publisher": { "@id": "https://pickuptrucktalk.com/#organization" }, "image": { 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