Intermittent battery problems

[Edge1950]

I have a 2015 3.8 genesis with 105,000 miles .Went to start car and everything was totally dead ,dash lights, door locks, etc.. went to battery in the trunk wiggled around a few wires and everything look normal and as I was contemplating what wrenches needed to remove the battery to charge it, everything went back to normal without touching anything .Four days later wife goes to start car and same thing with everything totally dead. I go out later to have a look at it and everything is normal and starts right up without my having touched anything.

Trusted auto repair shop could not find any codes or any problems. Hyundai dealership first appointment is six weeks away.

Any suggestions?

 

[Kwanmitch]

I have a 2015 3.8 genesis with 105,000 miles .Went to start car and everything was totally dead ,dash lights, door locks, etc.. went to battery in the trunk wiggled around a few wires and everything look normal and as I was contemplating what wrenches needed to remove the battery to charge it, everything went back to normal without touching anything .Four days later wife goes to start car and same thing with everything totally dead. I go out later to have a look at it and everything is normal and starts right up without my having touched anything.

Trusted auto repair shop could not find any codes or any problems. Hyundai dealership first appointment is six weeks away.

Any suggestions?

Did you find the fix for this issue. I'm having the same problem with my 2015 5.0

 

[joegr]

Did you find the fix for this issue. I'm having the same problem with my 2015 5.0

Your positive battery clamp is loose. The bolt that tightens it will be as tight as you can make it, but the clamp itself will still be loose. It is a bad design. The clamp itself is less than $15, but that whole battery junction box assembly has to be disassembled to change it. As a work around, some have used battery post shims.

 

[Kwanmitch]

Thanks.. I'll have a look. It would be great if that's the case.

 

[joegr]

Thanks.. I'll have a look. It would be great if that's the case.

Take out the bolt that holds the positive junction box to the car. See if you can then just lift it straight up and off of the battery post. It's very difficult to check without removing that bolt.

 

[Kwanmitch]

Take out the bolt that holds the positive junction box to the car. See if you can then just lift it straight up and off of the battery post. It's very difficult to check without removing that bolt.

Yep..did what you said and it came right off. I'll pickup some battery shims tomorrow and see if it continues.