Question about Chrysler 300

1 Answer

My engine light came on the other day and it goes off and on. my friend has a scanner and the code came up p404. What should I do next?

Posted by on

  • Anonymous Mar 11, 2011

    Tell us what vehicle you have


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Chrysler Master
  • 1,975 Answers

The EGR (Exhaust Gas Recirculation) system's purpose is to redirect exhaust gas back into the cylinders. Since exhaust gas is inert, it displaces oxygen and fuel, thereby lowering cylinder temps, which, in turn, lowers oxides of nitrogen emissions. For that reason it needs to be carefully metered into the cylinders (via the EGR valve) so as not to adversely affect the engine's performance. (Too much EGR and the engine won't idle).
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); on Facebook

If you have a P404 , then the EGR valve is likely an electrically controlled EGR valve instead of a vacuum controlled EGR valve. Also, the valve will usually have a feedback system built into it that informs the PCM (Powertrain Control Module) what position the valve is in; open, closed, or somewhere in between. The PCM needs to know this to determine whether or not the valve is operating as needed. If the PCM determines that the valve should be operating, but the feedback circuit shows that the valve is not open, this code will set. Or if the PCM determines the valve should be closed but the feedback signal indicates that the valve is open, this code will set. Now enough of all that technical stuff. Basically tou will need to test your voltage at your EGR valve. I'm not sure of the scanner has but some you can use to test the circuit. You will need to make sure you are getting about 5 volts to it. If not you have either a bad ground going to it or a short somewhere in the circuit. Worst case is you could have a faulty PCM (not likely). You may have a faulty EGR valve as well but I would do my best to make sure of this before I would replace as the electric EGR's can get expensive. I hope you got all this and that I hope it helped...Good luck. One other thing you could have carbon buildup in the EGR causing it not to work correctly as well. If you can clean the build up that will help as well.

Posted on Mar 11, 2011

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

My check engine light comes on stays for quite awhile then goes off for a few days

Hi June,
Well, something is going on. Something, somewhere is intermittent and throwing the error. What happens next is you "pull the codes". A device hooks up to the car's computer and reads what ails it.
However, this often is not the answer, but rather a clue.
For example, a small vacuum leak will cause a partial misfire, and the oxygen sensor may throw an objection. The point is: do keep after it, something is going on and it is never good. But often not a big thing.

Jan 12, 2016 | 2006 Chevrolet HHR

1 Answer

2008 2500hd Duramax/Allison trans. Why is check engine light on?

Have codes read by someone with good scanner that reads trans codes.

Oct 28, 2012 | GMC Sierra Cars & Trucks

1 Answer

Check Engine light constantly going on and off on 2009 Hyundai Sonata

soon as you have the check engine light on,use the scanner to see what is the fault.

Sep 26, 2012 | 2009 Hyundai Sonata

1 Answer

I have a 2003 Ford Focus, automatic. Just recently I was on the freeway coming home, next thing you know my check engine light came on and my car started down-shifting. The next morning I had to take my...

If the check engine light came on,,then you have a code..Some scanners wont read the transmission codes..It sounds like a shift solenoid,,but you need to have the right scanner to see which one...Dont keep driving it ,,or you will do damage to the transmission

Oct 13, 2011 | 2003 Ford Focus

1 Answer

Check engine lite on .pull codes p404. Also has lite miss on easy acceleration from stop.Need to pass state emissions test

P0404 EGR circuit range just replace the EGR,the light miss is from your egr pintle being stuck open. either you clear the code with a scan tool or if you dont have one it will take 2 trip of no emission problem for the ECM to clear the check engine light,

May 05, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

My Check Engine light comes on quite often but it goes off the next day when I start my car. And Sometimes it goes off when I shut the caqr off the turn it back on. Also I have a rattling but only...

It is best that you have a scanner used on your car to retrieve the error codes. The sound that you are hearing may or may not be related to the error the car's ECU has detected. Once you get the error code you can accurately diagnose the problem.

Apr 18, 2011 | 1994 Pontiac Grand Am

1 Answer

My check engine blinks 10 times then goes out


The check engine light comes on mostly when you have bad gas tank cup,or you don't tight enough the gasoline.Go to any auto-zone and request the obd scanner,at no charge just leave your driver license or credit card,connect the scanner follow the instructions.They will check up and the check engine light will come off in the next 3 to 5 days.

Thank you !!

Jul 13, 2010 | 2002 Dodge Grand Caravan

1 Answer

2004 gmc serria ext cab (check engine light)

You can''ll have to replace the other cure

Apr 08, 2017 | 2004 GMC Sierra

1 Answer

While driving car tach goes way up and car almost shuts off and cruise light came on and then it went off after giving some gas . got an engine light on and got a code 12 54 and 55.

My problem was similar. It would want to cut off while driving but keeps going. Had fuel pump replaced same thing. had throttle body cleaned and computer codes put back in. Same thing. No one figured what it was till it didn't start one day then start the next day the code told dealer it was the crank sensor. Friend has same car with the same problem it was the crank sensor.

Aug 08, 2008 | 2003 Chrysler Concorde

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

136 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chrysler Experts


Level 3 Expert

75817 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8180 Answers

Are you a Chrysler Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides