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Check engine light - gas cap

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waveman

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I apologize if this has been posted before, but I couldn't find it in a search.

When I started my car at work last night I noticed that the check engine light was on. The car seemed to run fine, so I drove home and let it sit overnight. It was still on when I started up this morning so took it to the dealer.

The service manager said that the code was was caused by a loose gas cap at some point. However, he couldn't tell me if I'd done anything wrong - I'm careful to turn the cap until it clicks once whenever I fill up.

Does anyone know if you can clear this code by opening and closing the filler cap?
 
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The service tech should have cleared the trouble code after he hooked it up to his scanner and discovered what the code was. It it just as easy as the push of a button once the scanner is hooked up.

If it was indeed a trouble code for a loose gas cap and it was put back on properly, the trouble code should clear itself after an unknown amount of time and or engine start up - shutdown cycles. Removing and reinstalling the gas cap won't clear the code in and of itself.

I had the same problem with my 09 Genesis 4.6, and there was a TSB that fixed that issue and I believe it was a program update for the ECU.
 
waveman said:
I'm careful to turn the cap until it clicks once whenever I fill up.
Click to expand...
I am not an expert on this, but I read somewhere that it is best to keep turning until it clicks at least 3 times, which is what I do.
 
The 2011 Genesis and Equus only require one click, the 2009 required three. They are just trying to mess with us I guess.

NOLa
 
PSL said:
The service tech should have cleared the trouble code after he hooked it up to his scanner and discovered what the code was. It it just as easy as the push of a button once the scanner is hooked up.

If it was indeed a trouble code for a loose gas cap and it was put back on properly, the trouble code should clear itself after an unknown amount of time and or engine start up - shutdown cycles. Removing and reinstalling the gas cap won't clear the code in and of itself.

I had the same problem with my 09 Genesis 4.6, and there was a TSB that fixed that issue and I believe it was a program update for the ECU.
Click to expand...

The note on the invoice said that the tech performed an "evap leak test," which I presume means a check for a pressure loss related to a leak somewhere. That passed. He then cleared the code. The note went on to say that the light was probably "caused by a loose gas cap at one point." Anyway, I guess I'll pay more attention the next time I fill up.

Thanks, everyone.
 
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I hope your dealer can get the problem fixed, because if your cars' check engine light is still on after they did service work to it, there is still a problem to be fixed that Hyundai should be responsible for. Did I read your post right in that the check engine light is still on, and what year model is your car? I know the 09 4.6 had this issue on a lot of the cars that a quick, free ECU update fixed.
 
PSL said:
I hope your dealer can get the problem fixed, because if your cars' check engine light is still on after they did service work to it, there is still a problem to be fixed that Hyundai should be responsible for. Did I read your post right in that the check engine light is still on, and what year model is your car? I know the 09 4.6 had this issue on a lot of the cars that a quick, free ECU update fixed.
Click to expand...

Sorry if I gave the impression that the CEL is still on - it's not, and I wouldn't have left the dealer if I had been.
 
No worries waveman, reading a post can sometimes be rather one dimensional and subject to interpretation. I'm glad you got you Genesis fixed.
 
Re: Check engine light - gas cap: new question

The light came on again at the end of the day - I suspect it's the same problem again, but I guess I'm in for another trip to the dealer.

The manual says that the gas cap should be tightened until it clicks, otherwise "the Malfunction Indicator Light will illuminate." The note under the filler door says that you should turn the cap until it clicks once. I always do that. But is turning it so that it clicks a second time not a good idea? I'd hate to think that this is happening because I'm not replacing the gas cap properly when I fill up.
 
Re: Check engine light - gas cap: new question

waveman said:
The light came on again at the end of the day - I suspect it's the same problem again, but I guess I'm in for another trip to the dealer.

The manual says that the gas cap should be tightened until it clicks, otherwise "the Malfunction Indicator Light will illuminate." The note under the filler door says that you should turn the cap until it clicks once. I always do that. But is turning it so that it clicks a second time not a good idea? I'd hate to think that this is happening because I'm not replacing the gas cap properly when I fill up.
Click to expand...
I was told to turn it until it clicks at least three times, and I always do that, and have never had a problem (or warning light) during 2.5 years of owning a Genesis (same for other cars I have owned).
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Re: Check engine light - gas cap: new question

Mark_888 said:
I was told to turn it until it clicks at least three times, and I always do that, and have never had a problem (or warning light) during 2.5 years of owning a Genesis (same for other cars I have owned).
Click to expand...

The warning in the filler compartment makes it sound as if the cap should be turned until it clicks once but not more. That doesn't make much sense to me. But since this is the second time this has happened, it made me wonder. I'll see what the dealer says. Thanks.
 
Re: Check engine light - gas cap: new question

waveman said:
The warning in the filler compartment makes it sound as if the cap should be turned until it clicks once but not more. That doesn't make much sense to me. But since this is the second time this has happened, it made me wonder. I'll see what the dealer says. Thanks.
Click to expand...
I think you are a bit paranoid. Turn it until it clicks several times, it will not damage your car.
 
I just checked the message on my 2009 Genesis gas cap (on the cap itself) and it says:

"Turn until clicks." Doesn't say anything about "once." I didn't see any other warning label.
 
Ever since I bought my 2009 (an "early 2009" model with the harsh suspension) I've always "clicked" the gas cap several clicks. When it screws on, the natural stop point has the words upside-down... so I turn it half a turn until the words are perfectly upright. It just looks better. So far no problems - no signs of a worn-out gas cap, no check-engine lights from a leaking fuel system, etc.

The whole point of the "click" is like a clicker-style torque wrench: when the cap is at the desired tightness, any further turning of the cap just exceeds the torque limits of plastic fingers making the cap handle slip relative to the body of the gas cap, preventing over-tightening which would damage the gasket/seal. So in theory one click is enough... unless those particular plastic fingers are worn out... then the cap might be a tad loose. Going 3 clicks means you'd have to have 3 worn-out finger sets - with no good sets in between - to end up with a loose cap. Of course the more clicks you turn past the faster you will wear out the fingers...

mike c.
 
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Re: Check engine light - gas cap: new question

Mark_888 said:
I think you are a bit paranoid. Turn it until it clicks several times, it will not damage your car.
Click to expand...

Perhaps so... but as the saying goes, just because you're paranoid doesn't mean that they're not after you. :)

Truth is, I always turn the cap to at least one click and try not to over-tighten it. But this is the second time I've had this problem and I have very little time to go to the dealer. All I want to do is find out what, if anything, I'm doing wrong or if the gas cap or other parts (valve, sensor?) need to be replaced so I don't have to keep returning.

(BTW, mikec's post about this in 2009 was an excellent description of how the system works.)
 
When my light came on, the tech told me to not only turn 3 clicks, but also to push inwards while turning the cap. I have never had a light before or since that one incident and I have turned 3 clicks since the cars was new (2 years this month).

Had an oil change and inspection yesterday. They had an Eqquis in the showroom; very nice, but I could not justify the cost and it would be a tight, tight fit in my garage.

Original Dunlops are shot at 23,500 miles. Almost down to the wear blocks. I have a set of Michelins on order to be installed later this week.
 
Went to the dealer today and, as expected, they found nothing wrong. So it's 3 clicks for me from now on.
 
Just experienced a "check engine" light due to an improperly sealing gas cap. Incident occured 7/14 and new cap will be in 7/15, should be an easy install.
Have always turned the cap until I'm satisfied it's tight. (Check fluid levels, check tire pressure, now add check gas cap) technology can make life more harassed some times.
 
Ummm....lot's of misinformation here...I suppose that's the nature of the internet BB...

Th2 2011 gas cap has a torque wrench type action where it is turned until you feel/hear the click and then release it, thus indicating the proper torque has been applied. Continued turning simply applies more torque, and the second click you hear will be the destruction of the gas cap internals...

Over tightening the gas cap can compromise the seal as well...follow the instructions applicable to YOUR car and have the cap replaced if it does not seal right....

BTW..."the gas cap must be loose" is dealer service code for "I dunno what's wrong with your car or how to diagnose it, but I reset the silly light. Please leave so we can get back to our domino game...." It is unlikely that your gas cap is the issue...make them show you the trouble codes!

Richard
 
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