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Old 12-08-2004   #1
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Question P0401 EGR Flow Insufficient Detected

Okay this really sucks, about two months ago my car got hydrolocked in some really lovely rainfall we had--no thanks to the a$$hole who roosted up the water all over my car--got car back with a 16,000 mile used engine...(fahqing insurance company)...three days later presto CEL light comes up and the code is none other than:

P0401 Exhaust Gas Recirculation Flow Insufficient Detected


can anyone eSplain this to me and how to fix it...sorry for sounding newbish and all--any and all help will be greatly appreciated.

FrankieB
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Old 12-08-2004   #2
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Old 12-08-2004   #3
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1) Reset the ECM/PCM

to do this you need to pull a fuse under the hood. Its the No. 6 ECU 15A

pull this fuse for 15 seconds and then reinsert it

2) Go for a test drive under the following conditions

No electrical load, Im assuming they mean no headlights, radio, etc etc

and decelerate from 55 mph for at least 5 seconds

3) Check for a temporary DTC with the HDS or a scan tool

Is Temperorary DTC P0401 indicated?

YES-Clean the intake manifold EGR port with throttle body/intake cleaner. Also clean the passage inside the EGR valve with throttle body/intake cleaner, or replace the EGR valve.

NO-Intermittent failure, go to step 4

4) Turn the ignition switch off

5) Disconnect the EGR valve 6P connector

6) Connect the battery positive terminal to EGR valve connector terminal No 4

Click the image to open in full size.

7) Start the engine and let it idle, then connect the battery negative terminal to terminal No 6.

Did the engine stall or run rough?

YES-Intermittent failure, system is OK at this time

NO-Clean the intake manifold EGR port with throttle body/intake cleaner. Also clean the passage inside the EGR valve with throttle body/intake cleaner, or replace the EGR valve.

This is straight out of the Honda shop manual,

Last edited by Got Boost???; 12-08-2004 at 05:02 PM.
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Old 12-08-2004   #4
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thanks a bunch...
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Old 06-28-2010   #5
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Re: P0401 EGR Flow Insufficient Detected

The same thing is wrong with my '04 Civic VP. The original engine that was in the car seized up while under wanrranty. My honda dealer replaced the engine with a remaned engine got the car back drove to the house the MIL pops on. I take the car back the next day they told me DTC P0401 so they replaced EGR and gasket with a new parts gave it back to me not even a month later the MIL pops back on. I check the code its DTC P0401 so i take it back again different Service Advisor this time. They again tell me DTC P0401and replace the EGR and gasket with new parts. I get the car back and a few days later the MIL comes on again and its the same DTC P0401 & DTC P0404 (EGR Valve Insufficient Lift) so by now im sick of the dealer going through the motions and not fixing the problem. So I have a friend that was a Honda Tech so I take my car to him and we diagnose that its not a bad EGR by applying current voltage to it while car is on but not running. We also test all the wiring going to and from the EGR for a short and also to verify the correct voltage is where it should be. And it was so we remove the EGR valve and inspect the passage and intake manifold for blockage nothing. So back to the dealer it goes 2 weeks later the dealer tells me that the intake manifold and water passage and all gaskets and o-rings need to be replaced But that its not coved under the warranty due to the carbon buildup and itll be $1150.00.
So I tell them im not paying that im picking my car up tommorrow have it ready!! So now 13 months later and my reg is due and its mandatory smog in California every other year. So now Im screwed took it to honda dealer again and they charge me half price just $70.00 to clear the code i asked if they test drove it he said yes i asked did u get on the freeway he says no. I tell him test drive on the freeway he declines. So off i go to pick to pick it up and get on the freeway just to have the MIL come back on so i go back to the dealer they check and recommend replacing the EGR valve i tell them im not paying $370.00 for the same fix that didnt work the first 2 times. So what i really need is the wiring diagrams from Mitchell On Demand for my car. My friend got a copy of AllData wiring diagrams for my car but he says they are not thorough enough. Hes positve it is another cause for the MIL and suspects another sensor or system is just passing the code to the EGR. This was after we had cleaned out the intake manifold thoroughly. I think it is the ECU does not like the reman engine for some reason. Can anyone help.

THNX
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Old 06-28-2010
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