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2015.5 xc60 t6 random loss of all power after turning car off

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wwwvvvggg
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2015.5 xc60 t6 random loss of all power after turning car off

Post by wwwvvvggg » Tue Mar 10, 2020 8:22 pm

2015.5 xc60, single owner, engine replacement at 49K. The car has70K today and recently had rear bumper repair from rear end accident. We have a new issue that started afer body repair and the dealer has been unable to solve.

Occasionally, like every 15 days, after parking, the car does not have any electrical current, will not start, dashboard doesn't light up etc. If we wait 8 hours, the car starts again or if we disconnect the battery terminals, it sometimes restarts faster.

The battery has only 15k miles on it, has a full charge, and is high quality. All terminals have been cleaned and wiring has been checked. It is like it takes a short rest break. The dealer said the issue was fixed but it keeps happening. Anyone have any ideas on how to investigate further? I would really appreciate any ideas.

jimmy57
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Re: 2015.5 xc60 t6 random loss of all power after turning car off

Post by jimmy57 » Tue Mar 10, 2020 8:43 pm

Has it ever done this while the dealer had it for repair?
If you repeat the problem there is a check I would do if I were working on it while it not powered up. Remove the back battery cover to access the ground (-) terminal and cable end. with car exhibiting the no electrical power check from battery post to engine block or good chassis connection. There should be a reading of 0V but if the battery monitor sensor on the negative cable end at battery negative post is faulty then you will read 12V between post and chassis or engine. I am assuming the issue was before and after the new battery. There can be a failure of battery internal cell connector that can make battery go open and then recover later. Usually that kind of internal battery problem will only do that few times before it fails completely. The stop/start switching unit by the secondary battery in under wiper/cowl cover could conceivably kill electrical power but I have not heard of that as a failure and it would likely be connections and only affect some items in car.
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wwwvvvggg

wwwvvvggg
Posts: 3
Joined: Tue Mar 10, 2020 8:10 pm
Year and Model: 2015.5 xc60
Location: California
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wwwvvvggg

Re: 2015.5 xc60 t6 random loss of all power after turning car off

Post by wwwvvvggg » Tue Mar 10, 2020 9:01 pm

thank you very much for quick reply. Has happened more "instantly" lately with new battery but nothing in first 3 months new battery. Lots of issues with old battery saying low battery, various messages and did fail a few times but was able to be jumped. All of that stopped with new battery. I had read about start/stop switch maybe having something to do with so we have that turned off. Regardless, this sounds like a great way to check and will do next time it happens. Unfortunately, and of course, never happened at dealer. Would you mind explaining what "open and then recover later means". Appreciate the feedback and will re-post when solved or more color.

jimmy57
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Re: 2015.5 xc60 t6 random loss of all power after turning car off

Post by jimmy57 » Tue Mar 10, 2020 9:52 pm

If the internal connection goes open that means the connection is broken and there would be no voltage measured at battery terminals. WHen that happens the connection can cool off and then battery has power at terminals again.
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wwwvvvggg
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Re: 2015.5 xc60 t6 random loss of all power after turning car off

Post by wwwvvvggg » Thu Mar 12, 2020 9:03 pm

Yes, as we have thought about it, you must be right. It only happens when the battery is hot, meaning when we have stopped the car for a short amount of time and try to start it again. It never happens in the morning, or after the car has been off for a long time. We're going to replace the battery and let you know if it worked. Thanks so much for forcing us to think in the right direction!

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