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P0401 Diagnostic Trouble Code Discussion for March 2012

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2008 Chevrolet Silverado 2500 HD WT 6.6L MIL Lamp on VIN: 1GCHK23618
P0401: EGR insuficiant flow. Truck was at dealer and they recomended EGR cleaning for 800.00. Truck has no symtoms aside from MIL on. Customer wants me to do job and I've never done one before and would like some advice. Alldata and Mitchell have little info and our archives don't have mu...
March 09, 2012
1998 Toyota Tacoma DLX 2.4L MIL Lamp on VIN: 4TANL42N8W
P0401: EGR System Insufficient Flow Detected. I have replaced the VSV valve that operates the EGR valve as some prior posts have recommended. I have also removed the EGR pipe and valve to check for restrictions/clogs and I didn't find any. The EGR valve appears to be working properly (will stumble @ idle ...
March 23, 2012