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Check engine light, Evap system faults

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13K views 3 replies 1 participant last post by  Jonboy  
#1 · (Edited)
I've have my 2018 plug-in Ioniq for almost a year now, it has about 4500 miles. I have been on a business trip for 2 and 1/2 weeks so the car sat unused for a while. When I returned, I drove the car in EV mode for a short trip and noticed the check engine light was on. The manual calls it the malfunction indicator lamp (MIL).

When I noticed the light I wondered if it might be caused by the engine sitting unused for so long so I switched to HEV mode for a few miles. The engine ran fine but the light did not go away.

So I borrowed my friend's OBD2 diagnostic reader and saw two fault codes:

P24BB - Evap system leak detection pump pressure sensor circuit high.

P2401 - Evap emission system leak detection pump control circuit low.

So far I have unscrewed the gas cap and screwed it back on. Then reset/cleared the codes. I started the car and there was no check engine light while parked. Later when driving home the check engine light appeared again. As far as I can tell the car runs fine, no noticeable issues.

I couldn't find any additional information on the first code. But a google search on P2401 described a few things that could cause an emission system leak. I have not found any posts on this forum related to those codes.

Has anyone seen these evap system type fault codes with their Ioniq?

Edit - One good thing about not driving my car for 2 and 1/2 weeks is when I came back the car had that new car smell again. I guess that's what happens when it sits with the windows closed for a few weeks.
 

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#2 ·
I checked the gas cap again and noticed for the first time that 'Tighten it until you hear one click or check engine light may appear' is written on the cap. To be honest I don't recall doing this when filling up with gas. I always did this with my old car but some reason never realized it applied to the Ioniq. So tonight I tightened the cap with one click and drove the car around the block but the check engine light is still on. Maybe I will drive it for a couple days and see if it clears up.
 
#3 ·
The check engine light kept coming back even after clearing the codes and tightening the gas cap. So I took it to the dealer for service. They say the problem is a faulty purge valve. They don't have the part in stock but they can get it next day. And the repair is covered under warranty. I will post an update when I get the car back.
 
#4 · (Edited)
After another round of phone calls, the dealer service dept. found that a mouse (most likely) had chewed on a wiring harness under the car which caused the purge valve to fail. They repaired the wiring at my expense (the warranty doesn't cover damage from mice), and the purge valve started working again as normal. I got the car back today and everything seems ok. I'm relieved that the car itself was not faulty, and my faith in Hyundai cars is still strong. Only 15 more trouble free years to go and I can say it is as dependable as my Honda was. However, the dealership experience has again left me wondering... A topic for another post maybe.

Edit: I forgot to mention that they also checked to see if there were any recalls in affect for my car (US 2018 plug-in Ioniq). There were no recalls in affect. Nice.
 
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