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Replaced egr valve now diagnostics say possible valve may be stuck open how do you unstick it

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Not sure what year this vehicle is but i have a feeling that if its newer than a 2005 then only the dealer can remove this code fault as a lot of vehicles use encrypted software from the year 2005 onwards .Now you could try disconnecting the battery and joining the leads together so the ECU capacitors are discharged which means it loses its memory ,remove the + battery terminal and using a jumper lead connect this cable to the battery - and leave overnight ,cant promise it will work but??

Posted on Aug 01, 2010


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What is po402 code

P0402 code
- EGR volume control valve stuck open
- Faulty EGR volume control valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Faulty EGR temperature sensor and circuit
Read more:

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Why is codes p2106 p0401 on?


May 29, 2014 | 2005 Ford Explorer

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P1404 code

P1404 is EGR valve stuck open. Probably need to replace your electric EGR valve. First, I would remove it and clean the carbon out of it before replacing this expensive part.

Apr 05, 2012 | 2002 Hyundai Accent

4 Answers

Grand carvan gives p402 code

This is not a cut and dry fault code. This means that more than one thing wrong can set the code in the computers memory. Here is the low down on the P0402 fault code. This is from the OBD2 fault code diagnostic book.

P0402 - Exhaust Gas Recirculation Flow Excessive Detected
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
Possible causes - EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks

Jan 18, 2012 | Cars & Trucks

2 Answers

Fault code p0401

This error means Exhaust Gas Recirculation Flow Insufficient Detected.

You can deatils on the following site

but for convenience I have reproduced that information here:
Generic OBD Error Code Details for P0401 Exhaust Gas Recirculation Flow Insufficient Detected What does this mean? OBD Code P0401refers to
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. SymptomsPossible sumptoms of OBD code P0401
You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms. CausesPossible causes of OBD code P0401
A code P0401 most likely means one or more of the following has happened: •The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced•There is a blockage in the EGR (tube), most likely carbon buildup •The EGR valve is faulty •The EGR valve may not be opening due to a lack of vaccuum Possible SolutionsIn fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit. •Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open •Clean out the EGR valve and/or tubing to remove deposits•Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)•Replace the DPFE sensor (with a good quality / OEM one)•Replace the EGR valve Related CodesP0400 P0402 P0403

Jul 12, 2011 | Hyundai Tucson Cars & Trucks

2 Answers

I have a code P0401. What is this and how can I fix it?

P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

Mar 20, 2011 | 1998 Ford Taurus

2 Answers

Got diagnostic code P1406 on 1996 Saturn SL1

P1406: EGR valve pintle position circuit. Try cleaning any carbon deposits in your EGR valve. That's where I would start. I hope this helped and good luck.

Feb 10, 2011 | 1996 Saturn SL

1 Answer

Ford Explorer : How to Troubleshoot the EGR P0401 Trouble Code

P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible Causes:
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks
- Faulty EGR valve

Possible Solutions:
- Clean EGR Valve
- Replace EGR Valve
- Repair EGR harness or connector
- Replace EGR volume control solenoid valve
- Replace EGR volume control valve

Jan 24, 2011 | Ford Explorer Cars & Trucks

1 Answer

I have a 1995 nissan altima GXE and i replaced my IAC valve saying the trouble code i was getting from the self diagnostics was IACV?ACC valve, IAT Sensor, EGR Solenoid Valve, and Knock Sensor but it only...

The EGR solenoid is activated by the ECM at mid range speeds so if you are testing it at a idle it will not show voltage. The ECM grounds the solenoid to turn it on which supplies vacuum the source to the EGR valve.. To test the EGR solenoid unplug it and supply power to the terminals on the solenoid with jumper wires. Just apply power momentarily and listen for the click.Don't power it on for long as it will damage the solenoid if energized for long periods.If the solenoid is working check the EGR valve by connecting a piece of vacuum hose to it and applying vacuum to it. If you put your fingers under the edge of it you can feel the diaphragm moving as it opens and closes when applying and removing the vacuum. If don't have a vacuum pump tester you can do it easily with your mouth on the hose as it doesn't take much vacuum.If the EGR is stuck remove it and try cleaning the carbon out.If you can't free it up replace the EGR valve. If you need more help here is a site which provides diagnostic help with pictures.The also have the part availible for purchase at a very low price along with many more hard to find emission related parts.

Oct 30, 2010 | 1995 Nissan Altima

1 Answer

1996 Honda Accord Rough Idle Even After tune up performed Changed spark plugs, distributor cap and rotor wheel along with all spark plug wires, changed fuel filter, air filter, spent $150 on fuel injector...

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

Mar 02, 2010 | 1996 Honda Accord

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