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P0401 Diagnostic Trouble Code Discussion for April 2008

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2002 Pontiac Grand Prix GTP 3.8L egr low efficincy VIN: 1G2WR52132
P0401: Insufficient EGR Flow Detected. OK i have a 2002 grand prix s/c. i have been working on this vehicle for a couple of weeks. I have replaced the egr valve and the cleaned the passages. the map sensor is changing with the rpm changes. the exhaust is factory with no damage. we have reset the ec...
April 01, 2008
1997 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K2V
P0401: Insufficient EGR Flow Detected. ... steam out exhaust, . Inspected upper penum, cracked. Replaced penum, and lower intake seals,[oil leaks]. Veh. started, ran fine. On test drive, DTC P0401 set on the 3 test count, inspected EGR valve, would open, but sticky at the top of movement. cleaned, ...
April 02, 2008
2002 Pontiac Grand Prix GTP 3.8L egr low efficincy VIN: 1G2WR52132
P0401: Insufficient EGR Flow Detected. OK i have a 2002 grand prix s/c. i have been working on this vehicle for a couple of weeks. I have replaced the egr valve and the cleaned the passages. the map sensor is changing with the rpm changes. the exhaust is factory with no damage. we have reset the ec...
April 02, 2008
1996 Toyota Camry DX 2.2L MIL Lamp on VIN: 4T1BG12K9T
P0401: EGR System Insufficient Flow Detected. I have tried to fix this car for several months on and off. I have even tried to farm it out and the problem stays the same. Any suggestions would be greatly appreciated.
April 02, 2008
1998 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M5W
P0401: Insufficient EGR Flow Detected. car came in with mil on po401 code. i checked snap on troubleshooter and says that pcm does a test once every ign cycle.and at 40mph on decel pcm opens egr and checks for map volts to raise.i took a movie and checked map sensor voltage when pcm is testing and ...
April 10, 2008
1999 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K3X
P0401: EGR System Insufficient Flow Detected. I have been testing this vehicle for several weeks. engine light usually comes on after 3rd drive cycle. Thusly vehicle returns to me.Engine runs great 02's switching,and have vacuum at all solenoids. To make this worse I have another toyota come in today with...
April 14, 2008
1998 Ford E-250 Econoline 4.2L MIL Lamp on VIN: 1FMCU24X1N
P0401: insufficient flow egr. initially found dpfe shorted to power(reading 4+volts at idle.replaced dpfe.1.07volts at idle.koer test indicates 5psi.vacuum to egr.removed egr for cleaning.opens at 3psi,holds vacuum.egr tube clear(newer also recently.)removed egrbracket to intake(clear.)sta...
April 28, 2008