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Possible battery/electrical issue

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So I just popped into the shop for no more than 15mins when I came back I unlocked the car and then boot via remote and got in  no issues so far however I pressed the start button and she fired up as usual straight away however I noticed that it started going through a reset on the dash looked into my warnings and had 2

1- set time date

2- battery was possibly disconnected

 

any ideas appreciated

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It's an E60. 

 

So the first thing you do is switch it off and back on.

 

If the same thing happens again you know it's a real fault.

 

Sounds like one of the electrical glitches.

 

What condition is battery in? 

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Ok so keeps happening says excessive  battery discharge or something like that lol my memory is rubbish 

dont have any way to test the battery that I can think of

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Brand can vary but it will have the BMW stamp on it, just don't buy LION branded. AGM are the best bet and usually come in 85ah to replace the 80ah fitted.

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Ok so I had the battery tested and it’s ok but needs a recharge? 

When I got home I plugged icarly in just to see if I had any faults that might be the issue and I also thought I’d re program the battery in too. But icarly was not able to read the battery apart from the amount of ah strange any ideas 

7B9910CF-A286-47FB-A5DC-AA9DFB4DEADE.jpeg

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Mine gets the voltage warning every now and then due to it mostly doing short trips.

If I take it for a decent run once a week it's usually ok.

 

12.12V is a bit low for an E60. They don't like it that low and will start to give random errors.

 

Another fault to look out for is the IVM (integrated supply module) which can cause all sorts of electrical gremlins, including rough idle and shifting issues.

It's under the cabin filter housing on the drivers side.

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