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P0401 Diagnostic Trouble Code Discussion for November 2010

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2005 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHK23225
P0401: EGR Flow Insufficient Detected. ... egr activation test and all % match des and acutual and maf drops dramatically. maf 48 no egr, 28gs with 10% egr, 3gs with 30%. performed amp test on 5vlt term a to b= .165. tested volt drop on b to grn .05volts. calculated results for ohms was .303 ok. Co...
November 02, 2010
1997 Ford E-150 Econoline Club Wagon Custom 5.4L MIL Lamp on VIN: 1FDEE14L0V
P0401: Insufficient Exhaust Gas Recirculation Flow Detected. Hey guys, lots of posts on this code and issue, went through all of them and check engine light is still coming on. I replaced the DPFE with a factory one from Ford. Removed EGR valve and cleaned throughly. Cleaned elbow passage going into the intake, inspecte...
November 04, 2010