× 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 September 2007

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
1996 Subaru Legacy Outback 2.5L MIL Lamp on VIN: 4S3BG6859T
P0400: Insufficient EGR System Flow Detected. ... came in we checked the electrical and had vacuum at the EGR but was not opening,Replaced EGR and Cleaned all passages Head and Tube,cleared code and car was back in two weeks,Rechecked system was working OK,Checked for TSB NONE,Let customer go to see if it...
September 03, 2007
2000 Jeep Grand Cherokee Laredo 4.0L No Start, MIL Lamp on VIN: 1J4GW48SOY
P0400: egr. Cranks but no start. Code P1389 No ASD output voltage @ the PCM. The 15Amp #26 injector fuse was blown & blows immediately upon replacing.The fuel pump relay is being powered up but the injector fuse keeps blowing. I have unplugged the O2 sensor fuse since...
September 04, 2007
1998 Mazda Protege DX 1.5L MIL Lamp on VIN: JM1BC141XW
P0400: EGR System Flow Malfunction. ... Vehicle does not run poorly, no constant misfire. MIL light on, no codes under solus using asian specific. MIL is commanded on under data. Can only pull codes from Global OBDII. Found the two codes. PO400 EGR Flow and P0303 Cyl #3. Check plugs and wires, o...
September 04, 2007
2000 Nissan Maxima GLE 3.0L MIL Lamp on VIN: JN1CA31D8Y
P0400: EGR System Recirculation Flow. Came in with two codes P0400 & P0420. Cleared codes, let it cool down. Went through the test drive, and the P0400 came back. While driving it I was watcing the EGR Temp, and the EGR control. I didn't notice much temp cange wen te valve was opening or closi...
September 07, 2007
1996 Geo Metro LSi 1.3L MIL Lamp on VIN: 2C1MR5294T
P0400: EGR System Performance. Good Morning. We are having a hard time understanding this EGR system. The PO400 code will reset on a 5 mile test drive. We are only getting 4 - 6 inches of vacuum to the EGR valve. Is this enough? All components test out according to Alldata diagnostics. The ...
September 14, 2007