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Old 03-14-2011, 08:44 AM   #1
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JK gascap light

so my gas cap is securely attached and the gascap light wont turn off, its an 07 wrangler sahara.

any suggestions?
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Old 03-14-2011, 09:05 AM   #2
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WOW, must be a new one--whats a gascap light ???


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Originally Posted by da_duck View Post
so my gas cap is securely attached and the gascap light wont turn off, its an 07 wrangler sahara.

any suggestions?
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Old 03-14-2011, 09:11 AM   #3
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You have to drive for several miles before it resets or attach a code reader to erase the code.
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Old 03-14-2011, 09:16 AM   #4
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I hope this helps

Loose Fuel Filler Cap Message
After fuel is added, the vehicle diagnostic system can
determine if the fuel filler cap is possibly loose, improperly
installed, or damaged. Aloose fuel filler cap message
will be displayed in the instrument cluster. Tighten the

gas cap until a
clicking sound is heard. This is an
indication that the gas cap is properly tightened. Press

the odometer reset button to turn the message off. If the

problem persists, the message will appear the next time
the vehicle is started. This might indicate a damaged cap.
If the problem is detected twice in a row, the system will
turn on the Malfunction Indicator Light (MIL). Resolving
the problem will turn the MIL light off.









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Old 03-14-2011, 09:54 AM   #5
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so in other words i need a new gas cap? does it need to be OEM?
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Old 03-14-2011, 10:05 AM   #6
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Quote:
Originally Posted by da_duck View Post
so in other words i need a new gas cap? does it need to be OEM?
You may not need a new gas cap. If there is a problem with the evaporative canister system; damage, loose connection, etc. you will also get a fuel filler cap message.
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Old 03-14-2011, 10:12 AM   #7
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and that means goin to the dealership?
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Old 03-14-2011, 10:26 AM   #8
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If it won't reset, yes. At least it's under warranty.
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Old 03-14-2011, 11:36 AM   #9
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even if it was bought used?
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Old 03-14-2011, 11:41 AM   #10
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Quote:
Originally Posted by da_duck View Post
even if it was bought used?
Depends on the year, mileage, etc. But yes, most of the Jeep warranties are transferable. Download your warranty booklet here and see if your still covered.
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Old 03-14-2011, 11:41 AM   #11
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Or you can see if an autoparts store will reset for you
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Old 03-15-2011, 10:12 AM   #12
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Cool Gas Cap Malfunction Indicator

I have a low mileage 2008 JKU (16K and purch 12/08). It's a daily driver.

I just had the message & subsequent indicator light last week. It came on a day after I filled up. I pulled the cap and re-installed it. Light didn't clear. So I tried the ignition switch "on-off thing" 3 times and the message and indicator light cleared. Don't know if it was a coincidence or not; but I'm just glad it's gone. An orange icon lit up on the dash is annoying and unsettling.

As a side note; After clearing the message/light, I now have to re-program my Auto Door locks to "Unlock All" when I switch the ignition off.
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Old 03-15-2011, 10:30 AM   #13
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Didn't know that,good to know THANKS!!.
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Old 04-24-2012, 05:49 PM   #14
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Gas cap light

I hate to be a buzzkill and hope this is not your situation, but I have had this problem since 2008 on my 2007 JK. The dealer admitted they could not figure it out. Originally i bought a new cap, then a more expensive locking one. Neither worked. The dealer said they went through the system with some vapor lock analyzer (sorry do not know the name it is really called) that would show where the problem was. They could not find it. They could not explain why it occurs. They said it was all correct. Basically i have a coder reader and periodically reset the code.
Actually I think it is a problem with the screwed up JK wiring that occasionally goes goofing, like the kill plug that you have to occasionally remove and replace to get the jeep to start. Dealer could not explain this either.
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Old 04-24-2012, 07:49 PM   #15
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gascap

Have a 2012 2dr---put on a Jeep gas cap cover just after purchased new and then a locking gas cap soon after that [both added w/less than 500mi]. About four weeks ago [~2600mi on odo], filled up with gas, when home, parked in garage for about a week. Next time I drove it, 'gascap' over odometer. Took my locking cap off, put OEM on, 'error' persisted. About two weeks later, no more gascap error. Placed locking cap back on...no errors since [for the past two weeks].

Never had a new vehicle before. Latest was a 2001 Intrepid. I know we're wanting to get 'green', be safe and save the environment, but all of these sensors and computer chips on the rugged Jeep? Had part 56038988AA replaced at 450mi for the ESP light which would not stay off...
SENSOR. Dynamics. Lateral Acceleration and YAW Rate. . [BNB], [BNG]. for 2012 JEEP WRANGLER (56038988AA)
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Old 04-24-2012, 07:55 PM   #16
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When I got my GASCAP dash light it had nothing to do with the gas cap but rather the EVAP canister. I have heard of some getting it because evap line was leaking but mine was because the electrical cord that plugs into the side of the EVAP canister came loose. Plugged it in and the error went away
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Old 07-19-2012, 07:26 PM   #17
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Hmmm I have the opposite issue, I have left my gas cap completely off 3 times now and driven anywhere from a few miles to 80 miles before I noticed it but I never had a "gascap" message displayed or MIL but according to the manual I should !
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Old 09-23-2013, 02:26 PM   #18
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I pulled off the O-ring from the gas cap, cleaned the O-ring and the top of the filler tube with methyl hydrate / methanol, lubricated the O-ring with Seal Saver (a lube for latex/rubber seals), flipped over the O-ring, and put it back on the gas cap. Problem solved. My guess is that the O-ring had dried out and flattened out over time, such that it could no longer keep the pressure seal. Once the other side flattens out, I'll replace it. 2007 JK.
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Old 01-27-2014, 09:12 PM   #19
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09 Wrangler GAS CAP LIGHT

I need some advice since the dealer has shut me out 3 times and made me replace a bunch of stuff for no reason. Ive replaced the gas cap, integrity pump and yes i did purchase the o ring that goes with that new pump(little plastic part underneath the jeep aprox $35). They smoke tested it several times and found no leaks anywhere in the jeep. They then proceeded to tell me that my gas tank needs to be replaced because there is "flex" in the gas tank. Im at the point where im ready to buy one of those tuners that can just shut your check engine light....some one help
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Old 01-28-2014, 08:33 AM   #20
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2012 JKU

I'm on my 3rd OEM Mopar gas cap. Replacing the cap in both previous Gas Cap light instances has turned the light out. I'm keeping the O- Ring dressed with Vasoline now.
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Old 02-01-2014, 10:48 PM   #21
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When they smoke tested it they identified the tank as the issue? I'm still on the original gas cap that came with my 07 and had a similar experience but found a small leak in a line that was rubbing on the battery. Also check your evap canister
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Old 06-06-2014, 01:48 PM   #22
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My gas cap light came on again about a year after the first occurrence. This time it turned out to be corrosion on the trailer wiring connection by the rear bumper. Not what I would have expected.
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Old 03-04-2016, 09:17 AM   #23
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I got mine this morning on the way into work, I am going to look into it see whats going on, hope it's nothing more then what's been posted above. I will let you all know once I get time to look into this.
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Old 05-19-2016, 07:37 PM   #24
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gASCAP

OK, my turn. My wife's 2015 JKU got the "gASCAP" indicator light today. She checked, pulled it off & put it back on until it clicked, but still got the indicator after starting the engine again. No MIL message & last gas fill was 5 days ago.

Consulting the 2015 Owner's Manual, it says ↓↓↓, but I just turned it to 'on' (not engine start) to snap a pic & the light was there for a sec then went away.
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Old 05-19-2016, 09:20 PM   #25
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Quote:
Originally Posted by bengen1 View Post
Hmmm I have the opposite issue, I have left my gas cap completely off 3 times now and driven anywhere from a few miles to 80 miles before I noticed it but I never had a "gascap" message displayed or MIL but according to the manual I should !
I did the same thing last week and nothing happened.
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Old 05-20-2016, 01:06 PM   #26
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More things than a gas cap being loose can cause that message to appear. My Chrysler had a bad ESIM switch that was caused by a dirty filter upstream of it. After two years, a few new gas caps and some other parts they finally found the problem.

It would always start out with that gas cap message, usually followed by a CEL a week or so later.
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Old 06-08-2016, 07:41 AM   #27
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Had the same problem for months...quick fix, at least for me

So for about a year, I've been getting the gas cap light in the odometer window and a myriad of CEL codes that always had something to do with the evap canister. After replacing the evap canister and the sensor behind it, and inspecting the tubes under the hood and around the canister, the lights would still come on. The last thing I did was install the vapor seal between the sensor and the canister. It's a $6 o-ring looking thing on Amazon. Put a little lithium grease on it, reset the CELs and bam...fixed. It's been about 1500 miles since the light and CELs came on. When I replaced my evap canister and sensor, the old ones didn't have that seal. Maybe it deteriorated but it fixed my issue...

Link to vapor seal: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

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