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Cp4 buzzing noise
I have a 2020 Ram 5500 6.7 Cummins with a build date of 8/20 It has the revised cp4 injection pump with the big dimple on the pump. Ever since we got this truck it makes a loud buzzing noise that cuts in and out and it’s super annoying. I read the tsb pointing out the 2 different pumps one is...- Pjc87
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- Forum: 2019-2024 6.7 Cummins I6 Turbo Diesel