Check Engine (Gas Cap) -
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 > Models > Jeep Wrangler Forums > JK Wrangler Technical Forum > Check Engine (Gas Cap) Sale EventFS: Jeep Fog Light LED Bulbs! Several Brightness Options! *STOP UNWANTED LIGHT BAR NOISE* with Pandemic LED Light Ba

Unread 04-27-2010, 03:02 PM   #1
Registered User
2013 JK Wrangler 
Join Date: May 2007
Location: Detroit, Michigan
Posts: 130
Check Engine (Gas Cap)

Hello all,

I wanted to see if anyone has this issue (I am having no luck re-setting my Check Engine light after having my Gas Cap stolen ...)

I was driving one day and the light came on, I had no idea why (the gaScap notification did not come up on the Odometer like the manual said it would). Called for Dealership appt. and he mentioned the Gas Cap and that was it, gone…

I then got a new gas cap (dealer ordered, not aftermarket) and still cannot get the light to re-set. I held down the trip odometer re-set and it still remains on.

Now, I have had cars where the light was always on (just the nature of old crappy vehicles) but this is a 09 JK Sahara with 7,000 miles on her. Plus, I can't use the Auto start...

Any help would be great.

Thank you,

SkipperTW is offline   Reply With Quote Quick reply to this message
Unread 04-27-2010, 03:08 PM   #2
Registered User
2010 JK Wrangler 
Join Date: Dec 2009
Location: SW WA
Posts: 948
drive about 100~ miles, several ECM cycles (as long as lite does not "flash" there is no misfire), if still on, you've got a hard code set and have dealer pull and diagnose, it's covered undr warranty as emissions issue beyond the 3/36 warranty BTW
JeffinWesternWA is offline   Reply With Quote Quick reply to this message
Unread 04-27-2010, 06:43 PM   #3
Registered User
Join Date: Apr 2010
Location: Oak Harbor WA
Posts: 2
I got this when I put a Wally World aftermarket cap on my rig. Just make sure you put a Mopar cap back on and unplug the negative battery cable for about 15 minutes. This will turn off the light but you will have to reset your clock.
biker_dude is offline   Reply With Quote Quick reply to this message
Unread 04-27-2010, 07:56 PM   #4
Registered User
2008 JK Wrangler 
Join Date: May 2008
Location: Denver, CO
Posts: 1,247
Fill up your gas tank so that it's easier for the vapors to pressurize it....that made the difference on the girlfriends lancer.
- Fletcher: Oil Field Trash Extraordinaire
Originally Posted by VetteDriver View Post
BTW, what's with the "if you haven't driven one shut up" nonsense? How can we have a good internet fight if experience and knowledge are going to be a requirement?
'08 Rescue Green Unlimited X - Hard Top, 3.73 gears, Limited Slip, Infinity 7 speaker system, KC Slimlite Long Range, Cobra CB, Rough Country 2.5" BB, 35" BFG KM2's on ProComp 7089's. Fenderless and proud!

My build thread: HERE

WVUJeeper is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the 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

Suggested Threads

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