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My DTC indicates egr flow is insufficient. What needs to be done

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What are the drivability problems?
I would disconnect the EGR vacuum hose,plug and test drive.
If problem goes away,replace EGR Valve

Posted on Sep 29, 2010

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HOW TO FIX VEHICLE WITH OBD CODE 0650


DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient - Probably has plugged passages . Take the EGR valve off the vehicle an clean the passages out .

May 17, 2016 | 2000 Pontiac Grand Prix SE

1 Answer

Egr insufficient flow


NO YEAR, STATED.
NO ENGINE STATED.
now that makes this hard, no? my only clue is the body shell.

why not post the DTC error , not your interpretations?
on newer cars there are up to 5 or more EGR DTCs.
the exact dtc or the lack of some , tell the FULL STORY.
for example on newer cars there is EGR feedback readings.

btw: i own a 04GV and have 100%+ documentation on it and can fix any EGR fail on any car made, sure can. GEN1 , to GEN now.
but need more INFO.

Feb 17, 2014 | Suzuki Grand Vitara Cars & Trucks

2 Answers

I have a 2004 pontiac grand am with the service engine light on. When read it was the P0300, P0401, and P1404 codes. The mechanic said there wasn't a leak, so it must be the EGR valve. It was replaced. I...


po300 random misfire po401 low flow egr p1404 egr. check spark plugs and check for vacume leaks. with the po400 1404 could be your egr valve is good but po400 means low flow which to me indicates that the egr passage may be clogged up and needs to be cleaned out check out scottykillmer.com the passage way may be easy to clean depending on the position of the egr vavle but you might have to remove the intake manifolld

Nov 02, 2013 | Pontiac Grand Am Cars & Trucks

1 Answer

Service engien soon light on a 1999 buick century code 401pd


If the DTC is P0401 it means that the EGR Valve is clogged or air flow is insufficient.Take EGR valve off and clean carbon out or replace EGR valve with a new one.

Oct 28, 2011 | 1999 Buick Century

1 Answer

Exhaust Gas Recirculation Flow Insufficient Detected 2002 Ford Crown Victoria LX The car works very good at 60 and I go 35 to city and then when we slow down to city speeds it will have little jerks and we...


P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents.
not likely the PCM, engine computer. they seldom go bad.
report back findings.

May 16, 2010 | 2002 Ford Crown Victoria

2 Answers

2005 Ford F250 Deisel DTC 401 Exhust recirulaton flow insuffent


The DPFE sensor has failed on you egr system .Replace just this part and don't let someone sell you a egr valve .The sensor is about$70 and faily easy to do .:)

Sep 09, 2009 | 2005 Ford F 250 Super Duty

1 Answer

Santa fee 2002 dtc p0340,p0401,p0102,p0340 again thanks


HI P340 CAM SENSOR P401 EGR INSUFFICIENT FLOW P102 FLOW METER CIRCUIT GOOD LUCK

Sep 02, 2009 | 2002 Hyundai Santa Fe

3 Answers

Insufficient EGR Flow problem


Specifically DTC P0401 is "Exhaust Gas Recirculation (EGR) Insufficient Flow". Now this is where we have to be careful when we read a code. In this case it is not saying the EGR valve is bad, it's saying the EGR flow is too low. Now it could be because the EGR valve is bad. Or it could be a clogged EGR tube or a broken vacuum line. This is why you have to be careful and check the whole system before you go changing parts. The PCM tests the EGR system during deceleration by momentarily commanding the EGR valve to open while monitoring the Manifold Absolute Pressure (MAP) sensor signal. When the EGR valve is opened, the PCM should see a proportional increase in MAP. If the expected increase in MAP is not seen, the PCM notes the amount of error that was detected and adjusts an internal fail counter towards a fail threshold level. When the fail counter exceeds the fail threshold level, the PCM will set DTC P0401. The number of test samples required to accomplish this may vary according to the amount of detected flow error. Normally, the PCM will only allow one EGR flow test sample to be taken during an ignition cycle. To aid in verifying a repair, the PCM allows twelve test samples during the first ignition cycle following a scan tool Clear Info or a battery disconnect. Between nine and twelve samples should be sufficient for the PCM to determine adequate EGR flow and pass the EGR test. To check the system first you need to remove the EGR valve and if it is clogged or broken. If it is, clean or replace it. If it is okay, then remove the EGR inlet tube from the exhaust manifold and the EGR outlet tube from the intake manifold. If either or both are clogged, clean them out or replace them. Then check the ports in the manifolds themselves to see if they are clogged. If so, clean them out. When you are done, disconnect the battery for about 30 seconds to clear the code and drive the car to see if the light comes back. This should take care of the problem. If not, then you will need to put a scan tool on the car and see what the EGR control system is doing wrong and correct it.
The Valve on this car is electronic, so, unfortunately a vacuum pump will not work for testing.
If you have a scan tool, you can command the pcm to open the valve to see if the valve itself is working.There are really only4 things to go wrong with these things, PCM, wiring,the valve itself, or plugged passages. I have never seen the pcm cause this problem, or the wiring for that matter. If you say you have pulled the EGR and checked the intake passages, then I would be pretty confident in saying the the egr valve itself is bad.
Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Mar 18, 2009 | 2000 Chevrolet Malibu

1 Answer

I am having trouble getting my check light to go off after I had it checked and the EGR valve was replaced. The light comes back on after about 15 miles of driving and the code reads EGR poor flow. I can...


Insufficient EGR Flow Detected

Possible Causes:
DPFE sensor signal circuit is shorted to ground
DPFE sensor VREF circuit is open between sensor and PCM
DPFE sensor downstream hose off or plugged
DPFE sensor hoses both off, loose or damaged
DPFE sensor hoses connected wrong (reversed)
EGR orifice tube is damaged or restricted
PCM has failed
And what sets the code is…….Engine started, engine running in closed loop under steady cruise conditions, and the PCM detected the DPFE sensor input indicated insufficient EGR gas flow. Run the KOER Self-Test, and if DTC P1408 is present, the fault is currently present. This code sets in 2 Trip(s). The light will stay on until the cause is repaired. A bad EGR valve is only on possible cause.

Hope this helps,

Dave

Feb 28, 2009 | 2002 Ford Mustang

1 Answer

Egr vacuum solenoid


Exhaust Gas Recirculation (EGR) System Monitor—Differential Pressure Feedback EGR The Differential Pressure Feedback EGR System Monitor is an on-board strategy designed to test the integrity and flow characteristics of the EGR system. The monitor is activated during EGR system operation and after certain base engine conditions are satisfied. Input from the ECT, CHT, IAT, TP and CKP sensors is required to activate the EGR System Monitor. Once activated, the EGR System Monitor will perform each of the tests described below during the engine modes and conditions indicated. Some of the EGR System Monitor tests are also performed during on demand self-test.
  1. The differential pressure feedback EGR sensor and circuit are continuously tested for opens and shorts. The monitor looks for the Differential Pressure Feedback EGR circuit voltage to exceed the maximum or minimum allowable limits.

    The DTCs associated with this test are DTCs P1400 and P1401.
  1. The EGR vacuum regulator solenoid is continuously tested for opens and shorts. The monitor looks for an EGR Vacuum Regulator circuit voltage that is inconsistent with the EGR Vacuum Regulator circuit commanded output state.

    The DTC associated with this test is DTC P1409.
  1. The test for a stuck open EGR valve or EGR flow at idle is continuously performed whenever at idle (TP sensor indicating closed throttle). The monitor compares the Differential Pressure Feedback EGR circuit voltage at idle to the Differential Pressure Feedback EGR circuit voltage stored during key on engine off to determine if EGR flow is present at idle.

    The DTC associated with this test is DTC P0402.
  1. The differential pressure feedback EGR sensor upstream hose is tested once per drive cycle for disconnect and plugging. The test is performed with EGR valve closed and during a period of acceleration. The PCM will momentarily command the EGR valve closed. The monitor looks for the differential pressure feedback EGR sensor voltage to be inconsistent for a no flow voltage. A voltage increase or decrease during acceleration while the EGR valve is closed may indicate a fault with the signal hose during this test.

    The DTC associated with this test is DTC P1405.
  1. The EGR flow rate test is performed during a steady state when engine speed and load are moderate and EGR vacuum regulator duty cycle is high. The monitor compares the actual Differential Pressure Feedback EGR circuit voltage to a desired EGR flow voltage for that state to determine if EGR flow rate is acceptable or insufficient. This is a system test and may trigger a DTC for any fault causing the EGR system to fail.

    The DTC associated with this test is DTC P0401. DTC P1408 is similar to P0401 but performed during KOER Self-Test conditions.
  1. The MIL is activated after one of the above tests fails on two consecutive drive cycles.
0a01005.gif EGR Vacuum Regulator Solenoid The EGR vacuum regulator solenoid (Figure 88) is an electromagnetic device which is used to regulate the vacuum supply to the EGR valve. The solenoid contains a coil which magnetically controls the position of a disc to regulate the vacuum. As the duty cycle to the coil increases, the vacuum signal passed through the solenoid to the EGR valve also increases. Vacuum not directed to the EGR valve is vented through the solenoid vent to atmosphere. Note that at 0% duty cycle (no electrical signal applied), the EGR vacuum regulator solenoid allows some vacuum to pass, but not enough to open the EGR valve.

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Exhaust Gas Recirculation (EGR) Vacuum Regulator Solenoid Removal and Installation
  1. Disconnect the battery ground cable (14301). For additional information, refer to Section 414-01 .
  1. Disconnect the vacuum hoses and the EVR solenoid electrical connector.
  1. Remove the two nuts and the EVR solenoid (9J459).
From the looks of the rubber mounting, I would say it's mounted on the cowl (firewall) on the passenger side in the engine compartment.

Please rate as fixya if this helps. Thanks

Feb 24, 2009 | 2001 Ford Escort ZX2

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