Anyone have any gas cap sensor problems? -
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post #1 of 22 Old 05-28-2010, 08:08 AM Thread Starter
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Anyone have any gas cap sensor problems?

I have 78k miles on my 07...bought it in for the usual oil/filter/lube service on Tuesday. Drove straight home from there. Wednesday I start it beeps just after startup and the dash display says "gascap". Since I didn't touch the gas cap at all between the service and me starting it, I figured someone at the dealer knocked a vacuum hose loose when servicing the jeep or something. I reseated the cap, and it still beeped at me. I didn't see anything obviously disconnected or loose under the hood.

Yesterday I took it to the dealer, who said "uhh we think it was a loose gas cap...Did you tighten it all the way?" Sure, and explain to me how it got loose when no one touched it? But anyway...

They said they plugged in a vacuum tester and there was no vacuum leak, so they assumed it was just a loose cap, and left it at that. They did say however that it was NOT throwing an error code at the computer.

When I picked it up at the dealer, it didn't bong at all.

This morning, I started it...yep, it bonged.

Before I shove the gas cap down someone's throat at the dealer when they ask me if I was sure I put the gas cap back on (never mind that I haven't touched it), does anyone know where the sensor is for this? A quick google for it doesn't bring any useable results :/

Since I didn't touch it and since they say there's no vacuum leak, I can only assume the sensor's gone bad...

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post #2 of 22 Old 06-02-2010, 05:01 AM
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When my jeep had the gas tank replaced due to it puking fuel every fill up, I had the same issue.

Turns out, there was a hairline crack in the replacement tank.

They did a "smoke test" (shoulda been done the first time, but that's neither here nor there - don't take your Jeep to Boniface-Hiers, fyi), and ended up putting another new tank on.
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post #3 of 22 Old 12-12-2011, 05:53 PM
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Hi. I know you posted this a while ago. But I currently have the same problem with my jeep, which is an 07. I currently have about 95000 on it. The gascap light showed up followed by the check engine light. They did a smoke test then told me it was the gas tank neck, repleced it and the problem showed right up again. Now they say it is some senor. I was wondering what your problems was.

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post #4 of 22 Old 12-12-2011, 06:01 PM
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I had that problem on m 11 with my locking gas cap. That problem went away when I went back to my factory gascap because the salt on the roads here caused the lock to seize on my locking gas cap.
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post #5 of 22 Old 12-12-2011, 06:32 PM
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I had it happen on my '07. I replaced the cap and cleared the code & still came back. Turns out it was the little sensor that goes into the evap canister. If I remember correctly it was pretty cheap to replace and easy to get to... at least with a 4" lift & 37's
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post #6 of 22 Old 12-12-2011, 06:59 PM
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Got it when I put a hole in my Evap Can. After I fixed the hole I had a few starts before it cleared the error. If your cap wasn't only all of the way it takes a few starts to clear it, otherwise there’s probably still a problem, somewhere...

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post #7 of 22 Old 12-13-2011, 06:06 AM
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you may want to disconnect your batty for 5 min. to reset the computer, if you continue to receive notices after that, then there is a leak somewhere.
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post #8 of 22 Old 08-08-2013, 09:56 PM
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I'm currently having the same problem. 9-1-1 help. My warranty is over and I can't pass smog because the system is reading the check engine light on code. Right now the gascap light is on & check engine light due to evaporative emission system leak ( small ) and exhaust gas recircuation ( high ). Which is the cheapest & quickest route? Change gascap, if it doesnt work? Smoke test?
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post #9 of 22 Old 08-09-2013, 07:48 AM
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I had this issue and replaced the gascap and it was still there. I ended up replacing an o-ring on the evap canister where the sensor is and that fixed the problem.
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post #10 of 22 Old 08-09-2013, 07:59 AM
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I just ignore it................

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post #11 of 22 Old 08-09-2013, 09:15 AM
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Originally Posted by Green2007JK View Post
I just ignore it................
That works as long as you don't have emission inspections. It won't pass if it shows that code.
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post #12 of 22 Old 08-09-2013, 12:44 PM
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Borrow someone elses gas cap and see if that clears it up, if not I think the sensor & o-ring would be the best bet. As I recall it was fairly cheap and quick to replace.
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post #13 of 22 Old 08-09-2013, 12:45 PM
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I have filled up, and between paying, texting, and entering my gas mileage info in my cell phone I forgot to put my gas cap in...

Drove home ~3 miles, no check engine light, ding, idiot lights or gascap messages...
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post #14 of 22 Old 08-10-2013, 10:28 AM
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Happens to me in cold weather only.
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post #15 of 22 Old 09-23-2013, 01:40 PM
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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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