When parts of the pump rub against each other ... you must have purchased a 2011-2016 Chevrolet Silverado or GMC Sierra diesel truck equipped with 6.6L Duramax engines and Bosch “CP4” high ...
Over 20 years ago GMC noticed a market developing for luxury pickup trucks. There was a subset of buyers that needed a truck’s capability, but still wanted the posh suppleness of a luxury sedan.