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Old 06-30-2015, 08:02 PM
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Wont start when hot outside

2015 Sport S w/power convenience group. About 3 weeks old now.

Looking for ideas of the cause of this, Dealer appointment on the 13th (after vacation). Temps were in the Upper 80's both days.

Two days in a row, my Jeep wont start after work. Parking location is in direct sunlight with windows rolled up (dirt lot). Yesterday I left the Jeep unlocked, so I climbed right in and tried to start it up. No clicking, no noise from the starter. Radio comes on, fan blows, headlights shine etc... But none of the buttons on my fob work.

Put the top down, checked battery, cleaned/tightened battery connections. After about 15 minutes, the Jeep started and all the fob buttons worked.

Today I arrived at work, locked it up and started my day. About 4pm, I walked out and tried my key fob, no buttons working again. Pulled out the 2nd key and tried the buttons on it, nothing working. Neither key will start the engine.

Now I am scratching my head, thinking over what I did yesterday to the Jeep. It struck me that it was after I put the top down that everything went back to normal. So I used the key to unlock the doors and propped them and the tailgate open. Went back in about 20 minutes, and the buttons on the fobs work again and both keys start the engine.

Any ideas?

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Old 06-30-2015, 08:33 PM   #2
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I would really suspect the battery, or one of its connections. Perhaps even the module that detects the key chip.

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Old 06-30-2015, 08:49 PM
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Checked the battery connections and cleaned the posts yesterday. Even put a load tester on the battery, it checked good.

I think the problem is with the Jeep recognizing the key chip, a loose plug or a bad module of some type.

Tried to push start it yesterday, turned over but would not fire.
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Old 06-30-2015, 09:19 PM   #4
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It sounds like a typical hair line crack on a circuit board. When very warm the crack opens enough to interrupt the circuit, allow it to cool a bit and the circuit crack closes enough to allow the circuit to function. I would make your appointment on the 13th late in the day. Take it by earlier and park it on their lot in the direct sun and hope for a hot day, that way you can recreate the failure. They cannot find it unless it has failed.
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Old 07-01-2015, 08:52 AM
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So opening the top and doors cools the board enough for the crack to close. Makes more sense than anything I can come up with.

Appointment is at 9am, I will ask them to park it in the sun and check it in the afternoon.

Thanks for the help.
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Old 07-01-2015, 03:24 PM   #6
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Originally Posted by BeardedOne View Post
So opening the top and doors cools the board enough for the crack to close. Makes more sense than anything I can come up with.

Appointment is at 9am, I will ask them to park it in the sun and check it in the afternoon.

Thanks for the help.
I agree with rgreen65. There have been known issues with JK Totally Integrated Power Modules (TIPM). This may or may not be your issue, but at least you're aware that it's possible.
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Old 07-01-2015, 04:12 PM   #7
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I agree with rgreen65. There have been known issues with JK Totally Integrated Power Modules (TIPM). This may or may not be your issue, but at least you're aware that it's possible.
X2, sounds like a power module issue to me!!!!!!
Thank goodness for warranty!
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Old 07-01-2015, 07:45 PM
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Thanks for the help, and the name of the unit that may be the problem.
Does anyone know where the TIPM is located? I would like to check the plugs on it and make sure they are tight.
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Old 07-01-2015, 08:33 PM   #9
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Thanks for the help, and the name of the unit that may be the problem.
Does anyone know where the TIPM is located? I would like to check the plugs on it and make sure they are tight.
Should be in a black box just forward of the battery:



WAYALIFE Jeep Forum : More than just a Jeep - It's a way of life! - M.O.R.E. Dual Battery Tray Installation Write-Up w/ODYSSEY Batteries (2007-11 JK))

Should look like this when you open it up:



OEM TIPM Study - JKowners.com : Jeep Wrangler JK Forum
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Old 07-01-2015, 08:45 PM
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I must be older than I think, because I would have called that a fuse box.
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Old 07-01-2015, 09:17 PM   #11
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Does anyone remember which fuse can be pulled to reset or allow the Jeep to start when it won't start due to key recognition issue? I'm sure I read it in a thread a while back but cant find it now. Useful if out on a trail somewhere. It was M-- something I think.
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Old 07-02-2015, 08:08 AM   #12
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BeardedOne the top is the fuse box and under the fuses is a circuit board that has relays and electronics.
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Old 07-02-2015, 05:57 PM
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Thanks Mike, that makes more sense.

Still doing it every day. I go out to the parking area around 4pm and check it, and it won't respond to key fob or start. Open the door windows and zip the back window down and walk away.

Come back between 5 and 6 and the fob works and she fires right up.

This one had everything I wanted (Orange, 3:73, manual, premium top and trak-lok) but also had the power convenience group. Npot feeling so convenient now.
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Old 07-14-2015, 07:14 AM
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Update:
Dropped it off yesterday and they parked it in the sun until early afternoon. Jeep wouldn't respond to the key when they went out to check it.

Current plan is they are going to replace the ignition module this morning, and sit it back in the sun until this afternoon to check the fix.

Dealer gave me a Ram 2500 to drive until the Jeep is fixed.
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Old 07-14-2015, 06:49 PM
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Well, it wasn't the ignition module. Still at the dealer while they troubleshoot.

Waiting in the garage for the return of The Great Pumpkin are:
Rock Hard Sliders, Cibie E Codes and IE Revolvers.

This sucks.
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Old 07-15-2015, 06:44 PM
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FIXED

Mechanics found a damaged Canbus connector, allowing one of the pins to back out.

They replaced the connector, and so far she starts every time.

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