Having a no-start, no-crank, no-FOB issue

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MountainManJK

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Jan 31, 2026
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new to this forum. Have a 2013 Rubicon, had since new. Has always been a reliable jeep, went out to start it the other morning and has a no start/no crank and no key fob working. After some research, and plugging in the JScan, thought it was the WCM. JScan said it couldn’t read it. Purchased a new WCM from dealer, didn’t solve. I suspect the problem is somewhere else in the electrical system, possibly the TIPM? It has also in recent weeks developed a parasitic battery draw, and some dash lights like sway bar, and traction control are erratically coming on. I am preparing to do a v8 conversion on it so was waiting to go through those issues, but this is a much bigger problem now. Has anyone had this experience or have some insight?
Thanks in advance.
 
Is the little red dot on in the upper right of the dash cluster? If so that's your security light and usually means your key FOB battery is dead.
 
BLACKJKU said:
Is the little red dot on in the upper right of the dash cluster? If so that's your security light and usually means your key FOB battery is dead.
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It was red yesterday when I was installing the WCM, and a couple other times, so intermittently yes. But I did replace the battery on the fob.
 
MountainManJK said:
It was red yesterday when I was installing the WCM, and a couple other times, so intermittently yes. But I did replace the battery on the fob.
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Did you try pulling up the yellow IOD Fuse, I think that's the name of it in the fuse panel?

Another thing do you still have the Junk Factory battery clamps on the battery, they are known to cause electrical problems?
 
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I ordered battery cables yesterday. Went through fuses again today, and fiddled with the battery cables I have now, no luck. Hope the cables fix it. I’m kind of dumb founded otherwise.
 
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The battery cables did not solve the problem. Have been tracing wires, looking for anything that looks suspect. No luck.
Does anyone know of wiring diagrams? Need to start checking at the pins on modules and components.
 
MountainManJK said:
Found the problem, this might be the dumbest reason ever. The sway bar!! It’s a rubicon with the electric disconnect. The plug was full of water, and shorted on a pin. That caused the entire powertrain to go dead. Amazing.
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Stupid crap like that is sadly common for these. If JKs didn't have a million electrical gremlins, they'd be almost perfect.
 
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