2011 Santa Fe P0455, no obvious leak? - Hyundai Forums : Hyundai Forum
 
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post #1 of 5 (permalink) Old 01-18-2019, 07:02 PM Thread Starter
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2011 Santa Fe P0455, no obvious leak?

Guys I need help. I’m a pretty techy guy, but have never really gotten forums so please be patient I am a noob. I am just at my wits end. I just got a 2011 Santa Fe, 2.4L GLS with AWD from my father as a winter car. I love it, however the inspection is coming due and the **** check engine light is on reading P0455, emissions large leak/no flow. You can smell gas strongly inside the car at times after sitting and I do notice the fuel economy isn’t great but that could be so to the fact I do all city driving to work. I simply don’t know what to do. I’ve had the car up on the lift twice, looked at the charcoal canister, purge valve, everything looks fine, no holes, no leaks, no gas smell, no cracks, nothing. The only place you can faintly smell gas is the connection on the bottom of the tank from the end of the filler neck, going into the tank itself. But it’s tight, sealed you can just faintly smell gas. The filler neck looks sealed and fine, and yes I have replaced the gas cap with an oem replacement. Does anyone have any ideas? Someone said replace the purge valve, but I don’t wanna drop 40 bucks if there could be another place I haven’t checked yet. Was wondering if there could be anything on the top of the tank that’s a common problem? But I know pulling that down would be a pain in the butt. Any advice?
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post #2 of 5 (permalink) Old 01-18-2019, 08:59 PM
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0455 is the system essentially remain atmospere when self test occurs...

PCM closes CCV,, then starts to duty cycle purge to dray system into vacuum and watch tank pressure sensor change and abillity to hold vacuum for so long...

Tank pressure value during self test with 0455 see no movement what so ever, tank pressure value remain atmosphere,, hence the LARGE EVAP LEAK code..

Possible CCV not close,, inspect wiring closely for CCV underneath..

As a DIY,, you at major disadvantage,, I have GDS to do self test,, and can do various manual task and do test to see if my task remedy,, then make repair

Purge generally leave a 0456 in some instance,, or 0441 incorrect flow.. you might look at purge and see if valve does indeed draw vacuum when PCM command, though you will have to wiat for valve to cycle and catch it via body side of valve with hose removed

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post #3 of 5 (permalink) Old 03-20-2019, 03:39 PM Thread Starter
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Red face

Replacing the PCM tonight, no voltage to it so that might be the culprit. Thank you so much for your help! I know it was awhile ago but your message helped me connect the dots! I'll let you know the results!
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post #4 of 5 (permalink) Old 03-20-2019, 05:20 PM
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Originally Posted by Jfedele22 View Post
Replacing the PCM tonight, no voltage to it so that might be the culprit. Thank you so much for your help! I know it was awhile ago but your message helped me connect the dots! I'll let you know the results!
You should test the wiring to the valve before condemning the PCM.

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post #5 of 5 (permalink) Old 04-10-2019, 12:56 PM Thread Starter
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Funny enough it ended up being the PCM valve, but the biggest culprit wa the fuel tank lock rings and seals. Easy enough replacement and I got to really vacuum under my rear seats! Thank you so much!
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