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P0401 Diagnostic Trouble Code Discussion for December 2009

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2001 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX54K61
P0401: Insufficient EGR Flow Detected. we have recently replaced leaking intake gaskets on this engine.after repair po401 egr came up,replaced map sensor,code came back after short drive,egr can be actuated and vehicle stumbles.all reading from two scan tools look normal. any response would be help...
December 01, 2009
2004 Chrysler Pacifica 3.5L MIL Lamp on VIN: 2C8GF68424
P0401: EGR System Performance. ... Light on. P0401. With scanner did egr test. This EGR does not have a vacuum hose but gets a PWM signal from ecm. When activated by scanner, the egr position voltage goes from 4.0V to 3.0v and engine will stumble and idle rough and manifold vacuum will drop...
December 16, 2009