2005 jeep wk (cel) error codes p0300 & p0406 - JeepForum.com
LinkBack Thread Tools
post #1 of 1 Old 08-12-2013, 10:43 AM Thread Starter
Registered User
2005 WK 
Join Date: May 2012
Location: Providence
Posts: 4
2005 jeep wk (cel) error codes p0300 & p0406

Hi All,
My check engine light just came on. Error codes are 300 & 406. I know that 300 is a random cylinder misfire & 406 relates to the EGR valve. Just wondering if anyone has experience with BOTH of these codes triggering at the same time. I bought the car with 70k, now has 85k, and thought there was a tune-up performed at 60K but can't find the receipt from the previous owner.

I just disconnected the battery to reset the CEL and will wait to see what happens.

Engine seems pretty smooth, gas mileage seems the same as when I bought it. Every once in a while though when I start it up, put it in drive, and give it gas it delays for a very brief second and it's barely noticeable.

So, I figure I may just need a tune-up but thought I'd check if anyone here has run into these two codes. Thanks!!!

2005 Jeep GC 4.7

myct90 is offline  

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome