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P0401 Diagnostic Trouble Code Discussion for May 2014

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2008 GMC Sierra 3500 HD WT 6.6L Hesitation, MIL Lamp on VIN: 1GTJK33638
P0401: egr insufficent flow. This truck drives ok under normal load but when accelerator is held to the floor it has no power, very low fuel rail pressure showing on scanner and goes into reduced power mode. I'm going to pull the fuel tank next week and clean the entire system any tips wo...
May 22, 2014