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Discussion Starter #1
I have a brand new 2018 JK Sport that doesn’t always starts. I have taken it to the dealer but they haven’t been able to duplicate the issue. It has happened to me 4 times in a week. Usually only once per day. Here are the details.

2018 JKU Sport S. Automatic transmission, Auto locks and security system plus 430 radio.

Jeep starts no issue. I drive anywhere for 30-60 minutes straight and park and shut off the engine. I leave the jeep and lock the doors with the fob. When I unlock the doors and try to restart the Jeep everything powers up but the Jeep will not start. No ticking, not even trying to turn over. Just nothing. Jeep is in park and 2wd. After anywhere from 5 minutes to overnight the Jeep will eventually start again.

Unfortunately I haven’t been able to replicate the issue when at the dealership (go figure) but have recorded the problem. I will post video links below.

Most times the check engine light stays on but no code retained. One time the security system light flashed continuously.

Any guesses?

Videos
3rd time videos
https://youtu.be/G1XODe-v3LA
https://youtu.be/G1XODe-v3LA
https://youtu.be/3tfXBEtFYz8


4th time video
https://youtu.be/zW6Ihp3cwro
 

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No power to starter solenoid. A flashing security light will prevent power going to the starter solenoid. Something is probably up with your key or the immobolizer system. Maybe even the ignition switch itself. Let dealer throw parts at it on their dime.
 

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Battery. Either the battery or the connections at the post.

I do not see the security light flashing. It is on when you first insert the key, but as the systems come on and the lights go out, the security light goes out as well. Besides, the SKIM does not keep the vehicle from starting, it just dies a few seconds later.

I would loosen the clamps a little bit, wiggle the clamps and then tighten them back up. Loose clamps or a failing battery can do weird things in the JK. It probably wouldn't hurt to take the battery to an auto parts store and have it load tested. They don't charge anything. If you have a voltmeter, you can check the voltage yourself, it should test at 12.6V or even a touch more. With the Jeep running it should be a little over 14 volts. But putting a voltmeter on it is NOT a load test.

I know it's a new Jeep, but the battery is a purchased item and the supplier may not have the standards of an Odessy battery.

When this happens, have you tried jump starting the Jeep?

I just had to replace the battery in my TJ (it was 5 years old) and it reacted similarly. I would go out, turn the key on and all the lights would light up, the secure key light would go out, I would turn the key and everything would go black. Nada. But, I could jump it off. But, this was cold, and once it had been running a bit, it would start normally, but the battery would not hold a charge.

It does not do it every time you drive it - or does it?
 

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When the battery starts to go bad the jeep does funky stuff, mine did.
 

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mytsmooth - that is a classic case of the shifter not being properly adjusted.
 

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Battery. Either the battery or the connections at the post.

I do not see the security light flashing. It is on when you first insert the key, but as the systems come on and the lights go out, the security light goes out as well. Besides, the SKIM does not keep the vehicle from starting, it just dies a few seconds later.

I would loosen the clamps a little bit, wiggle the clamps and then tighten them back up. Loose clamps or a failing battery can do weird things in the JK. It probably wouldn't hurt to take the battery to an auto parts store and have it load tested. They don't charge anything. If you have a voltmeter, you can check the voltage yourself, it should test at 12.6V or even a touch more. With the Jeep running it should be a little over 14 volts. But putting a voltmeter on it is NOT a load test.

I know it's a new Jeep, but the battery is a purchased item and the supplier may not have the standards of an Odessy battery.

When this happens, have you tried jump starting the Jeep?

I just had to replace the battery in my TJ (it was 5 years old) and it reacted similarly. I would go out, turn the key on and all the lights would light up, the secure key light would go out, I would turn the key and everything would go black. Nada. But, I could jump it off. But, this was cold, and once it had been running a bit, it would start normally, but the battery would not hold a charge.

It does not do it every time you drive it - or does it?
The security system won't prevent a start even if the hood is open or gas cap removed? I did not know that.
 

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Have you tried using the other key? It feels very much like the security system isn't allowing the computer to send start commands to the vehicle (the ignition is really just a button anymore that sends start commands) so mechanically it would be rare that the ignition in the column would be the issue.

I would try the 2nd key that came with the vehicle and see if the issue persists. It could be a stupid issue with the chip in your Key Fob working randomly (twisting in your pocket or something could make for sporadic functioning). Without a key programmed to your vehicle (which only the dealer can really do) the car would perform exactly like you are describing. what makes me think this is that issue is the occasional flashing of the security system LED as you stated.

Give that a shot if you have not already.

I had this issue in my old Jeep Cherokee sport (but that thing had 280K miles on it and was constantly an electrical nightmare for the last 30K miles) so it was not key related.
 

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Discussion Starter #10
OP here. Thanks everyone for the suggestions. The dealer had the Jeep for 2 days last week and put about 50 miles on and were unable to replicate the problem. I picked it up Thursday and have driven it about 2 dozen times over the weekend with no more occurrences. The dealer says that my Mobil speed pass could have messed with the immobilized but there is no way to tell. Regardless I no longer have it on my key ring. It seems they did disconnect the battery and as the radio had reset.

I’m hopeful that the gremlin has been chased off and I can enjoy the jeep I’ve been wanting for 20+ years.
 

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LOL, Mobil Speed-pass. I would have known that. I just didn't think those were still a thing. Saw it happen all the time when the ignition systems all went this way. But yep, I bet that was it.

Hope it keeps working for you and glad it worked out.
 

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The security system won't prevent a start even if the hood is open or gas cap removed? I did not know that.
Definitely not with the hood up. After all, how many times do you want the engine running with hood up to check something. I doubt it would keep it from starting with the gas cap off, but it will throw a code in that case.
 

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starter solenoid, bad battery, bad ground, or bad battery connections
 

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Discussion Starter #14
Well it happened again last night. Same situation as the 1st time. Started no issues and drove 50 miles. Parked at a store for 10 minutes. Returned and it wouldn’t start. Jumping it made no difference. Neither did disconnecting and reconnecting the battery. Had to leave it overnight and will try again today but heading back to the dealer after work.
 

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Could have something to do with the key. Maybe the security system isn't recognizing the chip in the key intermittently. Did you get 2 keys when you purchased? Have you tried them both?

EDIT: Sorry this was already addressed in post #9. That's what I get for posting before actually reading through the thread.
 

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Well it happened again last night. Same situation as the 1st time. Started no issues and drove 50 miles. Parked at a store for 10 minutes. Returned and it wouldn’t start. Jumping it made no difference. Neither did disconnecting and reconnecting the battery. Had to leave it overnight and will try again today but heading back to the dealer after work.
Personally, I would have called the dealer and had them come get it when it would not start. You should have roadside assistance with your Jeep. If they have to come get it every time, maybe they will have a better incentive to fix it.
 

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How many times at the dealer? Sounds like at least 3. In Florida, the law is....

"The Florida lemon law requires the manufacturer to repurchase or replace a car that meets a certain warranty repair history. Specifically, the Florida lemon law states that if a consumer has presented a car for the same recurring defect three or more times or the car has been in an authorized repair facility 15 or more days (this can be for different repairs and the days do not have to be consecutive), the consumer can then pursuant to the Florida lemon law statute provide written notification to the manufacturer that it has a final opportunity to repair the car."

Your state might have something similar. If so, bring the Jeep to the dealer along with a letter stating the history of the problem and reference the states lemon law. That will get there attention. They will give you a rental and hold on to it until they are sure it is fixed. Good Luck.
 

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How many times at the dealer? Sounds like at least 3. In Florida, the law is....

"The Florida lemon law requires the manufacturer to repurchase or replace a car that meets a certain warranty repair history. Specifically, the Florida lemon law states that if a consumer has presented a car for the same recurring defect three or more times or the car has been in an authorized repair facility 15 or more days (this can be for different repairs and the days do not have to be consecutive), the consumer can then pursuant to the Florida lemon law statute provide written notification to the manufacturer that it has a final opportunity to repair the car."

Your state might have something similar. If so, bring the Jeep to the dealer along with a letter stating the history of the problem and reference the states lemon law. That will get there attention. They will give you a rental and hold on to it until they are sure it is fixed. Good Luck.
Florida has a very strict lemon law. I used it to motivate Jeep to fix the head issue on my 12 JKU. It definitely got their attention.
 

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Well it happened again last night. Same situation as the 1st time. Started no issues and drove 50 miles. Parked at a store for 10 minutes. Returned and it wouldn’t start. Jumping it made no difference. Neither did disconnecting and reconnecting the battery. Had to leave it overnight and will try again today but heading back to the dealer after work.
check the connections on the starter. Get some Dielectric contact grease and put it on the clip for the starter wire:

https://www.amazon.com/Permatex-22058-Dielectric-Tune-Up-Grease/dp/B000AL8VD2
 

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This is probably way off base here. I responded to this because I had the same issue when I first bought my Jeep. The first upgrade I did was to have a new stereo installed. They used the tensioning nut on the battery terminal to mount the power for the new stereo (sadly, not the most disappointing part of the stereo install) But I had intermittent starting issues and couldn't put my finger on it, until I looked a little closer. The harness was on the terminal and it appeared to be making contact. I would really look at the battery cables and terminals.
 
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