Intermittent when the weather is hot the engine shutting off while coasting?

The sensor finally arrived. I found a little time to get it replaced yesterday. The car started and ran to the store fine. The real test will be today when I drive home from work. I'll give it a week and report back if this has resolved the problem. In the meantime, when I took out the old sensor, I noticed these worn spots (see picture) on the metal hole that it goes into. The sensor wasn't loose when I removed it and I didn't see any damage to the sensor or debris in the hole. I'm just including this in case it might be relevant.

So, it's been a week. It hasn't even shut off on me once. Admittedly the weather has been a little cooler but not so much that I wouldn't have expected it to shut off at least once. Thank you for your help figuring this out.

So, it shut off on me again on my way home today. Out of curiosity, was there a calibration or reset I should have done after replacing the sensor? I didn't disconnect the battery or anything while replacing it.

Is this a more in-depth scan than the one that AutoZone does? I've used their scanner and it showed no faults but I'm not sure if that's the same thing. It connected to the port under the steering wheel just like this one.

I haven't heard the fuel pump running but usually I have the A/C blowing and the radio on and both of those keep going when the engine shuts off and makes quite a bit of noise. Next time it happens I'll shut everything else off and see if I can still hear the pump. I'm going to try to get one of the can scanners ordered.

Look, I had this same exact problem 2015 Kia Forte. Just unplug this solenoid/sensor from behind the valve cover. Took a long time to find this out for me. It will make your check engine light come on and put your timing into default mode. I can give more information if you're curious. You do not have to take the cover off, it is just something to unplug right behind the valve cover, spot circled in picture. It took a lot of time and trying to fix random things. Not one single feed had the answer for me. We had to find this with an expert Mechanic in person.

Basically, if I keep that unplugged, my timing is in default. It makes me have a check engine light on instead. When I plug that in, the vehicle starts cutting off again. Apparently, there is a pin that the camshaft likes to rotate and set itself onto. The pin has been sheared off and when the camshaft tries to rotate over to rest on the pin, it shuts the vehicle off due to not properly being able to do so. Once you unplug that sensor, it puts the timing in default mode with no random camshaft movements. This narrows it down to a timing issue/internal engine issue. This is simply a bypass that works and isn't necessarily a repair. In fact, I believe and am suspicious that if I used a higher viscous oil, maybe 5w-30, synthetic, it would actually keep it from cutting off. Since I have this bypass by unplugging that solenoid/sensor, I might quit looking.

In my photo above, I circled where it is. It's exactly that location. No need to even take valve cover off. It is a plug right behind it where I circled. It can't be missed. It's against the back of the cover where I circled and is just as simple as unplugging a sensor. There is no danger in it, as it puts the timing in default mode without using all the fancy timing pulses. I believe what is being unplugged is a valve timing solenoid.

I haven't had any more problems since September. Admittedly it has been much cooler outside and that seems to keep it from stalling. I did order the scanner but haven't used it since it stopped shutting off. I might give the sensor removal a try if it starts acting up again when it gets warm.
On a possible side note, I went on vacation for a week and left it sitting in my garage. When I stared it it up, the rpms ran high for about 30 seconds like I had my foot hard on the gas. It's almost like gas had been leaking into the system the whole time I was gone or something.

Okay, thanks for the information. Remember my suggestion is here if it begins doing it again. I have a 2015 kia forte with 89,000 miles. It would cut off coasting to a stop and eventually got way worse before I found out I needed to unplug that sensor, that's barely out of sight where I circled in the picture. I wish mine would quit acting up like yours did. Strange how random it is! One thing is for certain for me, with that valve timing sensor/solenoid unplugged, it runs in default mode and absolutely never cuts off for me. This unplugged does force a check engine light because a sensor is literally unplugged, but it runs healthier since it's not putting itself in situations to do a safety cut off.

I have a 2015 Kia Forte also and it too was shutting down when coasting, with no other indication of a problem. It would start right back up when I came to a stop and put it in park, or simply by putting it in neutral while still moving. This only happened on hot days - temperature 85 or above.

I followed advice that it possibly was a sensor issue. One piece of advice was to unplug the oil flow sensor and see if the problem goes away. I did, and yes the problem went away. Thinking that this was proof that the sensor was faulty I purchased a new one from KIA and installed it ($215). It is 95 degrees today so I thought this would be a good day to test it out. 10 minutes later the engine shut down again, and another 5 times before I got home.

When I got this vehicle a couple of months ago my son gave me a couple of KIA oil filters. He's in the used car business, and told me that the KIA engines tend to tick if you don't use actual KIA brand filters - saying that for some reason the oil doesn't get pumped high enough in the engine. I was sceptical, but thought what the heck. It has an off brand filter, so I changed the oil and replaced the filter with a KIA filter. I then went for a test drive in 97 degree heat for an hour and the problem didn't reoccur.

The KIA oil filter fixed the problem.