Start stop not working

Mkcagle

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My start stop has stopped working. Message says not ready battery charging. no other warning lights. This has been going on for a few weeks. Does this signify a battery problem?





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Mr._Bill

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My start stop has stopped working. Message says not ready battery charging. no other warning lights. This has been going on for a few weeks. Does this signify a battery problem?
Yes, indicates a failing ESS battery. Have both batteries tested. If it goes on long enough, the main battery can degrade due to the additional load of the failing battery.
 

Mr._Bill

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I should say it usually indicates a failing battery. Some have reported the problem as being an issue with the charging sensor attached to the main battery. The truck is equipped with a 'smart' charging system that gives priority to the main battery.
 

Louie4

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I had this issue last fall and didn’t even think about it until last December. I took it to the dealer and both batteries were bad. But I live in Phoenix where batteries die every couple years.
 

Tar Heel Wrangler

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Had this issue with my JL. They replaced the ESS battery and it didn't fix it. I got stuck at a major intersection when I failed to turn off ESS and it wouldn't start. Ugh. Got some dingers yelled at me. "You dick!" and "That's what you get for buying a Jeep!"

It turned out to be a bad relay and they replaced the fuse box.
 
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Mkcagle

Mkcagle

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Appointment set for the shop next Wednesday. Not an emergency so I told them no hurry. Shop manager said definitely a problem that they have seen several times. He said they have been replacing the batteries and doing a computer flash per FC guidance.
 

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