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Old 02-07-2018, 02:48 PM
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Help! New 2018 JK won't always start

I have a brand new 2018 JK Sport that doesnít always starts. I have taken it to the dealer but they havenít 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 havenít 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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Old 02-07-2018, 05:32 PM   #2
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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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Old 02-07-2018, 06:27 PM   #3
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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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Old 02-10-2018, 01:44 PM   #4
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Autozone will test the battery for free. Try just using the key itself to lock and unlock it.
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Old 02-11-2018, 01:58 AM   #5
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When the battery starts to go bad the jeep does funky stuff, mine did.
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Old 02-11-2018, 03:11 PM   #6
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I would throw it in neutral when it did it. Maybe it's something going on where it doesn't know it's in park.
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Old 02-12-2018, 11:38 AM   #7
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mytsmooth - that is a classic case of the shifter not being properly adjusted.
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Old 02-12-2018, 11:49 AM   #8
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Quote:
Originally Posted by rgreen65 View Post
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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Old 02-12-2018, 11:59 AM   #9
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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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Old 02-12-2018, 06:40 PM
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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.

Iím hopeful that the gremlin has been chased off and I can enjoy the jeep Iíve been wanting for 20+ years.
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Old 02-13-2018, 09:23 AM   #11
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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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Old 02-14-2018, 12:39 PM   #12
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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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Old 02-14-2018, 01:50 PM   #13
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starter solenoid, bad battery, bad ground, or bad battery connections
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Old 02-15-2018, 12:44 PM
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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 wouldnít 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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Old 02-15-2018, 12:53 PM   #15
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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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Old 02-15-2018, 01:12 PM   #16
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Originally Posted by bobsolo View Post
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 wouldnít 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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Old 02-15-2018, 06:32 PM   #17
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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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Old 02-15-2018, 06:50 PM   #18
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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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Old 02-15-2018, 06:55 PM   #19
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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 wouldnít 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-2205.../dp/B000AL8VD2
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Old 02-16-2018, 01:13 PM   #20
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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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Old 02-16-2018, 01:36 PM   #21
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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.
Only if you have the remote start will it prevent starting with the hood open.
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Old 02-16-2018, 11:18 PM   #22
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Have you tried jiggling you transmission shifter or pushing it toward P? Could be a transmission sensor improperly adjusted and the interlock wonít allow it to engage the starter.
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Old 03-16-2018, 01:48 PM   #23
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Any luck with this???? You’re not crazy! I’m having the EXACT same problem. Dealer put in a new battery. Didn’t help. They just put in a new starter today and I’m afraid that’s not the problem either. They’re saying that’s “all they can do”. HELP!
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Old 03-16-2018, 07:20 PM   #24
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Sounds silly, but how fast are you turning the key after putting into ignition? Reason I ask is because a week a ago I had the same symptom as you. I put in the key and turned it instantly and I got nothin, waiting a few seconds and then it worked.
I make sure to turn the key 2 clicks now and wait for it to chime 2-3 times before I turn the key
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Old 03-18-2018, 09:38 PM
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OP here. Still having the same issue however I have been able to narrow down the source of the issue. The dealer has not been able to fix the problem yet, though. The dealers 1st repair was to replace the Wireless Control Module (WCM), but 2 days later I had the same no start.

Here's what I've determined:

The failure to start is actually by design and is not a problem with the key, security system or ignition. During all of my own diagnosis (not the dealers) I figured out that the Transmission Control Module (TCM) monitors a contact switch wired in series with the transmission temperature sensor to determine PARK and NEUTRAL positions. The TCM broadcasts the sensor position to the PCM which in turn allows operation of the starter circuit. If the TCM does not get the signal that the transmission is on P or N, the PCM will not a the Jeep to start. The TCM is either not getting the signal due to a bad sensor wire, or the TCM itself is bad. There is a difference between Shift Lever position, which is displayed on the instrument cluster and contact switch wired in series with the transmission temperature sensor to determine PARK and NEUTRAL positions.

The instrument cluster can display transmission temperature (Menu->Vehicle Info->Trans Temp). When the Jeep is in R or D, the transmission temp is displayed (~160 deg hot), however when in P or N, the temperature changes to engine temp (~220 deg hot). Only the temperature changes, not the words "Trans Temp".

I've been monitoring the display and now see that whenever the Jeep doesn't start, the temperature hasn't changed. In fact, I now know that if the temp doesn't change I shouldn't tuen off the Jeep as it isn't going to start. I've been able to get the Jeep to start by moving the shift lever back and forth between P and D several time and rolling the Jeep a bit. It sometimes takes a few tries, sometimes 5 minutes.

Here's a link to all of the videos I've taken.

http://www.youtube.com/playlist?list...bHjmnTkmiijERV

No start #12 was the 1st time I notice the temp changed which resulted in the Jeep starting (1:56). No start #17a & B (wife called during recording!!!) shows the full issue from coming to a stop and putting the Jeep in P, the temp doesn't change and the Jeep doesn't restart. After about 4 minutes of moving the Shift Lever and rolling the Jeep down the driveway the temp finally jumps (#17b 0:55) and I am able to start the Jeep and drive away.

I've presented all of this to the dealer, Chrysler Customer Care and a Chrysler Field director. The field guy came down this week. They took the Jeep and replaced the Total Integrated Power Module (TIPM), which controls everything. They claimed this had fixed it, and the very next day I had the same issue.
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Old 03-18-2018, 09:41 PM
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Some more info:
ATF Temperature Sensor:
The ATF temperature sensor is a positive temperature co-efficient (PTC) Thermistor. It measures the temperature of the transmission fluid and is a direct input signal for the TCM. The temperature of the ATF has an influence on the shift time and resulting shift quality. As the temperature rises, resistance rises, and therefore, the probing voltage is decreasing. Because of its registration, the shifting process can be optimized in all temperature ranges.

The ATF temperature sensor is wired in series with the park/neutral contact. The temperature signal is transmitted to the TCM only when the reed contact of the park/neutral contact is closed because the TCM only reads ATF temperature while in any forward gear, or REVERSE. When the transmission is in PARK or NEUTRAL, the TCM will substitute the engine temperature for the ATF temperature.

Starter Interlock
The TCM monitors a contact switch wired in series with the transmission temperature sensor to determine PARK and NEUTRAL positions. The contact switch is open in PARK and NEUTRAL. The TCM senses transmission temperature as high (switch supply voltage), confirming switch status as open. The TCM then broadcasts a message over CAN bus to confirm switch status. The PCM receives this information and allows operation of the starter circuit.
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Old 03-27-2018, 05:01 PM   #27
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Kind of a pain when the dealer can’t duplicate the issue
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Old 03-29-2018, 10:25 PM   #28
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Did you get the issue where your Jeep won't start figured out? It just happened to me today and I moved it to nuetral and tryed to start it the first time it didn't work I put it in park and back in nuertral again and it started.
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Old 03-29-2018, 10:49 PM   #29
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At this point it’s gotta count as a lemon in just about any state, no? They can’t leave you hanging for much longer, can they?
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Old 03-29-2018, 10:51 PM   #30
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Kind of a pain when the dealer canít duplicate the issue
Iíve found the best way to get around this is what the OP has already done;taking video is the key. They canít argue with it.
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