× 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 June 2009

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
2000 Ford F-150 Lariat 4.6L Hesitation, Surge, Poor Fuel Economy VIN: 1FTRX17W5Y
P0401: Insufficient EGR flow. HELP!!! Hope one of you Ford guru's have seen something like this. As I stated in the repair history, vehicle was first brought in a little over a year and a half ago with a PCM wire shorted at the accumulator. Wire was repaired and used computer installed at ...
June 01, 2009
2008 Chevrolet Silverado 3500 HD WT 6.6L MIL Lamp on VIN: 1GCHK33678
P0401: Egr Flow Insufficient. ... states that at random times the vehicle displays reduced power and ses light on. Usaly happens after coming to a stop. I verify the issue it happens to me with in few seconds of start up almost every time. Reduced power message on & code P0101 mass air...
June 02, 2009
2005 Ford Explorer XLT 4.6L MIL Lamp on VIN: 1FMZU73W45
P0401: Insufficient EGR Flow Detected (ESM System). Hi Guys,This truck came in with Code p0401. We diagnosed an Egr module - no change in voltage with vacuum applied. We also had an Egr code with the KOER Test. The code is still setting, but without any KOER codes. I have verified that vacuum supplies and intak...
June 15, 2009
2002 Ford F-150 XL 4.6L MIL Lamp on VIN: 3FTRF17W82
P0401: EGR low flow detected. I tested the EGR valve-ok. Tested vacuum to the EGR vacuum solenoid-ok. Tested vacuum to the EGR from the solenoid-ok. Inspected the EGR DPFE voltages-varies from 1.09-1.94-NG. Replaced the DPFE sensor. Same readings with the new sensor. Has anyone had the E...
June 26, 2009
1996 Ford Taurus GL 3.0L MIL Lamp on VIN: 1FALP52U8T
P0401: EGR insufficient flow. ... in this car. another tech put a EGR valve and DPFE on the car. i cleaned the passages, installed a EVR solenoid but still cannot get the EGR to function correctly. i have a vac gauge hooked inline and when i drive the car, the EGR will only operate a coupl...
June 29, 2009
1996 Ford Explorer Eddie Bauer 4.0L MIL Lamp on VIN: 1FMDU34X3T
P0401: Insufficient EGR Flow Detected. code keeps returning even after cleaning ports, checked vacuum to EGR valve, it's good, installation of new parts. Don't know what else to try. Computer? Everything that was done has always fixed other vehicles. EGR system working ok at this time. Help!
June 29, 2009