2005 jeep wk (cel) error codes p0300 & p0406 - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WK Grand Cherokee & XK Commander Forum > 2005 jeep wk (cel) error codes p0300 & p0406

JKS Grand Cherokee WJ, Adjustable Front Trackbar 1"-6Teraflex JK HD Hinged Carrier & Adjustable Spare Tire FREE, FREE, FREE EVENT!! Save big on Lockers now till Apri

Unread 08-12-2013, 11:43 AM   #1
Registered User
2005 WK 
Join Date: May 2012
Location: Providence, ri
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   Reply With Quote Quick reply to this message

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.

Thread Tools

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.