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Wont start when hot outside

11K views 15 replies 8 participants last post by  BeardedOne 
#1 ·
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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#3 ·
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.
 
#4 ·
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.
 
#11 ·
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.
 
#13 ·
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.
 
#14 ·
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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