× 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

P0400 Diagnostic Trouble Code Discussion for May 2004

Exhaust Gas Recirculation System Flow Malfunction

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 P0400
Help Request Posted
1998 Mazda Millenia 2.5L MIL Lamp on VIN: JM1TA2212W
P0400: EGR System Flow Malfunction. I need help diagnosing an intermittent po400 egr exh flow malfunction.I've tested the egr solenoids and valve.They operate fine.When manually operated.What I'm not getting is a ground signal from the PCM to activate the solenoids when the problem occurs. I'm l...
May 11, 2004
1998 Mercedes-Benz ML320 3.2L Poor Idle Quality, Surge, Cuts out, Stall, Misfire VIN: 4JGA54E9WA
P0400: egr flow. hello all this vehicle came in with customer complaining that it stalls. check crank signal when it stalls no crank sinal so replace it has not stall eversince but now lacks power and misfires.
May 19, 2004