P0455 - gas cap loose. How long to auto reset ? (1 Viewer)

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Aug 18, 2020
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Connecticut
I found that fuel cap was loose after CEL turned ON. This was immediately next day after a pit stop to refuel. I tightened the cap and then went about with my business and drove for 60 miles with 3-5 engine on/off cycles, but the CEL has persisted. This morning Autozone provided the code as P0455 and said mostly I need to replace the cap. On my way back, I refueled (just 3-4 gallons) and made sure the cap is tight, however the light remains ON. How long does it take to auto reset? Is there some fixed drives that need to complete? I do not have a diagnostic tool to reset. BTW, I also ordered a new OEM cap. I hope it does not need replacement of other complicated stuff like canister, valves etc.

Thanks
 
Not sure. Next time just have autozone delete all codes. Any obd code reader, including the cheapest ones, should be able to reset this code.
 
Just an update- the code cleared itself after 150 miles of driving with half tank of gas remaining. Based on internet reading, at a high level, the evap tests run only when the gas level is between 3/4 and 1/4 and needs specific driving cycles that meets its criteria for a evap test to run. I think there are few test runs that need to pass before it turns off the CEL.
 
I had all of my dash lights come on one morning a few months ago. I figured it was something non-catastrophic, contrary to all of the lights, and it was gas cap related. In my case I figured it was an old cap because I noticed the lack of a strong click when tightening it. Once I replaced it, the codes cleared but they did come on randomly at some point after the next fill up. I ignored it and it went away shortly after, never to be seen again. To me it seems like it can throw a bit of a temper tantrum but it will calm down eventually.
 

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