Gas cap leak indication

Tiny
HANNAJOHNT
  • MEMBER
  • 2012 HYUNDAI GENESIS
  • V8
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
With low gas level indicator came on. Filled tank. Indicator off. Is this possible?
Saturday, August 3rd, 2019 AT 4:57 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

Yes. The gas cap leak indicator is indicating a small evap leak. This is normally caused by the gas cap being off but it could be a leak somewhere else in the system. What happens is this is called a 2 trip failure code. That means the issue needs to happen two times in a row and the light will turn on. It is then a 4 trip to pass indicator. That means it needs to have 4 trips in a row with out the issue happening again in order to turn the light out.

More than likely it was a coincidence that it turned off when the tank was filled. However, if this happens every time you get a low fuel level and then turns off when you fill the tank then you may have a sensor issue with the evap system.

Just let me know if this happened one time or it does it every time. Thanks
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Saturday, August 3rd, 2019 AT 6:49 PM

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