Check engine light/ gas cap - JeepForum.com
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post #1 of 20 Old 05-06-2007, 02:37 PM Thread Starter
Firefight1981
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Check engine light/ gas cap

Has anybody experienced their check engine light (little transmission looking light) come on if you didnt screw in your gas cap as much as the vehicle wanted (3-4 turns)?

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post #2 of 20 Old 05-06-2007, 03:11 PM
GaryL06
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There is no dash light if you dont put the gas cap on. I know this because I once filled up in DE and drove 120 miles north into PA with the gas filler cap just dangling along side and had no idea until someone said something to me at a rest stop.
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post #3 of 20 Old 05-06-2007, 04:58 PM Thread Starter
Firefight1981
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I guess its just been a coincidnece then. Seems like a lot of times I turn the cap once and the light comes on. But if I turn it 3-4 times it doesnt come on. I dont know...the car is a piece of *****. Thats why Im selling it.
Its a 2003 6cyl Renegade with 76K on it. Ive had a few computer, valve body (transmission), drivers side back seat door lock broke (you have to manually lock/unlock it), cd player, weird noises from the engine (rattle with squeeking noises). Thats not a lot of miles to have those problems! Ive had two sports cars that were in the shop maybe twice with computer problems. They each had 155,000 miles before I sold them.
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post #4 of 20 Old 05-06-2007, 05:56 PM
Lucas718
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I have a 2003 Sport. A couple of months ago my check engine light came on too. I checked the gas cap and it seemed to be on tight. I really didn't have time to take it in to the dealer, so I thought I'd try replacing the cap and see if that made a difference. As soon as I put it on the light went out.
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post #5 of 20 Old 05-06-2007, 07:25 PM Thread Starter
Firefight1981
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Quote:
Originally Posted by Lucas718
so I thought I'd try replacing the cap and see if that made a difference. As soon as I put it on the light went out.
What made you think changing the gas cap would hopefully turn off the light? When I bought the car from the dealership, the salesman told me that happens sometimes. I honestly thought he was full of it.
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post #6 of 20 Old 05-07-2007, 07:26 AM
SpitNine
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Not This Time

Quote:
Originally Posted by Firefight1981
What made you think changing the gas cap would hopefully turn off the light? When I bought the car from the dealership, the salesman told me that happens sometimes. I honestly thought he was full of it.
In this extremely rare case the salesman was correct.
A bad or loose gas cap will cause the check engine light to come on.
Making sure that the gas cap gasket is OK, tightening the cap at least several clicks after refueling or replacing the cap with a new one will usually cause the check engine (MIL) light to go out on its own after a day or two or three.
Thanks.

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post #7 of 20 Old 05-22-2007, 05:11 PM
JSTODDA79
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As much as I have seen this issue on here, I already want to exchange my gas cap. What a funny issue to have lol.
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post #8 of 20 Old 05-23-2007, 06:20 PM
ZodiacMan
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I'm an emissions testing center manager, and I know all about the check engine light. If you don't screw your gas cap on tightly, your light will come on. That is true for any vehicle 1996 or newer. If you have it diagnosed it will come up as a code saying there is a leak in the EVAP system. You can drive it 120 miles straight without it coming on, but it usually takes a day or two and several startups for the computer to realize something is wrong and turn the light on. Just screw the cap back on tightly or replace the cap, clear the codes (either at AutoZone or you can do it yourself if you have a code scanner) and if that was the only problem, then the light will stay off. If the light comes back on, check out your vacuum hoses.
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post #9 of 20 Old 05-24-2007, 04:16 AM
rob92xj
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But at the same time there are about a thousand other reasons the light will come on, there could be something going on with your trans or other engine system. A fuel level sending unit could turn a check engine light on also.
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post #10 of 20 Old 05-30-2007, 07:59 AM
JSTODDA79
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I guess with it being a common issue, step 1 unhook neg terminal on battery, step 2 open gas cap and close again, turning several times after it clicks, step 3 replace negative terminal and see if the light goes off, if not, then take it to autozone for a free diagnostic check. So far that solves like 90% of the problems.. Dang gas cap... lol
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post #11 of 20 Old 05-30-2007, 09:21 PM
rob92xj
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Quote:
Originally Posted by JSTODDA79
I guess with it being a common issue, step 1 unhook neg terminal on battery, step 2 open gas cap and close again, turning several times after it clicks, step 3 replace negative terminal and see if the light goes off, if not, then take it to autozone for a free diagnostic check. So far that solves like 90% of the problems.. Dang gas cap... lol
The light will go out the minute the battery is disconnected, generally depending on the year of the vehicle it may take many drive cycles to turn the light back on but it will come back on because most EVAP system leaks are actually caused by a split hose.
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post #12 of 20 Old 06-01-2007, 08:00 AM
Lucas718
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Quote:
Originally Posted by Firefight1981
What made you think changing the gas cap would hopefully turn off the light? When I bought the car from the dealership, the salesman told me that happens sometimes. I honestly thought he was full of it.
Actually I hit a few of the forums looking for info and found quite a few people with the same issue and most of them turned out to be the gas cap. I didn't want to leave it at the dealer if it was a quick fix so I figured for a few bucks it would be worth a shot. Turns out that was the problem.
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post #13 of 20 Old 06-02-2007, 11:56 AM
JSTODDA79
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99% of the time, unhooking the neg terminal and putting the gas cap back on fixes this issue. YES it could be split hoses, but if your car is practically new, its prob the gas cap.. I put it on nice and tight.. no prob at all, except my wife needed help to take the cap off lol..
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post #14 of 20 Old 02-12-2015, 02:45 PM
jpjtech
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I have a 2008 Cherokee and the engine light + the check gas cap warning has been coming on. I have replaced the gas cap, took it to the mechanic and had all the hoses checked and tightened if necessary. He reset the code and cleared the fault...2 days later light and warning back...back to the mechanic repeat check. He said he checked everything and cleared code and fault again....next day they're back. Anyone have any help?
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post #15 of 20 Old 02-12-2015, 03:03 PM
tjkj2002
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Quote:
Originally Posted by jpjtech View Post
I have a 2008 Cherokee and the engine light + the check gas cap warning has been coming on. I have replaced the gas cap, took it to the mechanic and had all the hoses checked and tightened if necessary. He reset the code and cleared the fault...2 days later light and warning back...back to the mechanic repeat check. He said he checked everything and cleared code and fault again....next day they're back. Anyone have any help?
2 words..............


Smoke test.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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