× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P0401 Diagnostic Trouble Code Discussion for November 2007

Insufficient EGR Flow Detected

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2002 Mazda Tribute ES 3.0L MIL Lamp on VIN: 4F2YUO9132
P0401: isufficent egr flow. i have this tribute driving me crazy. i am getting mil light for the dpfe sensor.i scanned voltage and it is 1.01 volts,when you first start it. then it will go to 4.73-4.81 volts. checked harness from ecm to dpfe checks perfect.wiggled wires didn't change any...
November 01, 2007
1999 Toyota Camry LE 2.2L MIL Lamp on VIN: JT2BG28K8X
P0401: EGR System Insufficient Flow Detected. ... DTC P0401 tested system everything tested good. No vacuum to EGR until after engine warmed up and off idle. EGR valve opens when reving engine. When appling vacuum to EGR valve at idle engine dies. EGR valve is fully open at 4" vacuum and does not blee...
November 05, 2007
2001 Acura MDX Touring 3.5L MIL Lamp on VIN: 2HNYD18861
P0401: EGR System Insufficient Flow Detected. Hello Acura techs, I have a resricted egr passage problem. If I energize the valve (open it)there is no idle speed change. What I need to know is where do they clog up? There is a housing on the rear of the engine that is host to the egr valve and thermostat h...
November 19, 2007
1999 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M3X
P0401: Insufficient EGR Flow Detected. ... doesn't have any driveability issue other than the check engine light is on. the only code is the p0401 for insufficient egr flow. I can command the egr on with my scanner and the map voltage increases like it is supposed to. and it makes the engine stumbl...
November 20, 2007
1998 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M2W
P0401: Insufficient EGR Flow Detected. Does anyone know the amount of vacuum change the PCM is looking for during the EGR test?
November 28, 2007
2003 Chevrolet Impala LS 3.8L Hesitation, lack of power VIN: 2G1WH52K13
P0401: Insufficient EGR Flow Detected. ... advice. I am the third tech to attemp repair on this vehicle and am stumped. Vehicle came in with a P0401 code and a lack of power. They replaced to EGR valve which cleared the code. When running at light throttle vehicle run...
November 30, 2007