--- title: "NHTSA expands Bosch CP4 fuel pump investigation, millions of vehicles affected" url: "https://pickuptrucktalk.com/2023/04/nhtsa-expands-bosch-cp4-fuel-pump-investigation-millions-of-vehicles-affected/" publisher: "Pickup Truck + SUV Talk" content_signal: "search=yes, ai-input=yes, ai-train=no" author: "Tim Esterdahl" published: "2023-04-14T18:47:45+00:00" modified: "2025-07-23T15:12:11+00:00" image: "https://pickuptrucktalk.com/wp-content/uploads/2023/04/JP023_001GL22rdhrdkrhe5bj0dvlk8p3gbgv.jpeg" --- # NHTSA expands Bosch CP4 fuel pump investigation, millions of vehicles affected By Tim Esterdahl Published: 2023-04-14T18:47:45+00:00 Updated: 2025-07-23T15:12:11+00:00 ![Featured image]() If you are familiar with heavy-duty diesel engines, then you are all too aware of the Bosch CP4 fuel pump, which has led to catastrophic engine failures in [Ram](), [GM]() and even [Ford heavy-duty trucks](). This key issue seems to be that our diesel fuel in the U.S. doesn’t have the same lubricity as diesel fuel used in Europe, causing wear between the cam and roller and generating small metal shavings that could be released into the fuel system. The release of these metal shavings into the fuel system can cause catastrophic failure. ## **Probe expanded?** [According to CarComplaints.com](), the original CP4 failure investigation included 2019-2020 Ram 2500, Ram 3500, Ram 4500 and Ram 5500 trucks equipped with 6.7-liter Cummins engines. With such a checkered history, the NHTSA Office of Defects Investigation has decided to expand its safety probe to include any automakers who have installed the CP4 fuel pump. The upgraded probe now includes the 2014-2022 Ram 1500 trucks as well as 2021-22 Jeep Gladiator, 2014-20 Jeep Grand Cherokee and 2020-22 Jeep Wrangler vehicles. They are also looking at 2014-18 BMW 328D, 2014-16 BMW 535D and 2015-17 BMW X3 vehicles. A [recent AutoNews.com report]() says the CP4 fuel pump will be looked at again, and any vehicle with it – including many trucks and SUVs – could be recalled. The Bosch CP4 fuel pump has been a hot topic of conversation, with a [multitude of lawsuits]() and complaints connected to it. ## **What if your vehicle has the Bosch CP4 fuel pump?** If you have a vehicle with the Bosch CP4 fuel pump, you do have some options – you know, other than waiting for a lawsuit to be ruled on. GM and Ram trucks can be retrofitted with the Bosch CP3. Ford trucks can opt for a [CP4.2 bypass kit from S&S Diesel Motorsport](), and there is now a retrofit option here as well. Another option to prevent failure is using an additive like [LX4 Lubricity Extreme]() to help increase lubrication and prevent the metal shavings from forming. ## **The bottom line** While we generally have an overly litigious society, these Bosch CP4 fuel pump lawsuits have legs with many owners reporting upwards of $10k in damages. Then there’s the issue of whether some automakers knew of the problem and went forward with using the fuel pump anyway. With at least seven active suits, spanning several states, a final resolution could take some time. 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