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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 12-04-2013, 10:05 AM
jlittle67 jlittle67 is offline
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Mein Auto: 2008 328i
2008 328i battery reset

When I crank my car after it's been sitting for a few hours it acts like the battery has been disconnected: the time has to be rest and the brake lamp failure/fuel supply malfunction/trailer lamp malfunction light comes on. If I drive for a while the warning goes away. I've been having some problems with the battery charging as I've been spending most of my time on a military base where the speed limit is 35 mph. I found that this problem went away for the most part after I made a long road trip and the battery charged for an extended period of time. It came back after a few days. Could this be related to the battery somehow?
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  #2  
Old 12-04-2013, 10:59 AM
fdriller9 fdriller9 is online now
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It's your driving habits. The car doesn't charge the battery under 2k rpms or somewhere around that range.

35mph is too slow to get rpms up higher than 2k.

Invest in a battery tender.
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  #3  
Old 12-04-2013, 12:07 PM
jlittle67 jlittle67 is offline
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So when I go back to normal driving it will probably fix itself?
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Old 12-04-2013, 12:21 PM
fdriller9 fdriller9 is online now
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Yes and no. If the battery has been discharged for a while, and it's a lead acid, the plates inside are most likely sulfated, decreasing battery performance/life.

Once you start driving normally, take the battery out and have someone charge it. If you can use a tender that would be best because it can repair the battery but it will take a couple days.

If you're still having issues after charging, replace the battery.

Alternators are never suppose to fully re-charge a heavily depleted battery. For starters it would take way too long. Secondly, you're straining the electrical system.
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  #5  
Old 12-05-2013, 05:53 AM
jlittle67 jlittle67 is offline
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The service engine soon light came on this morning could that be related to this issue?
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  #6  
Old 12-05-2013, 06:14 AM
CALWATERBOY's Avatar
CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by jlittle67 View Post
The service engine soon light came on this morning could that be related to this issue?

Yeah, could be. CODE CHECK - any BMW Indy should have that or GT1. Shucks, I have one - maybe you should too!


Do you qualify for the Battery Cable Recall? Otherwise, yeah, could be your battery:







Yeppur, cold weather usually brings on a rash of "What's the snowflake icon mean?" and "Is my battery bad?" threads.

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When was your battery last replaced? What, never?!? Dude! When you replace it, assault your battery, an inconvenient R&R in the German tradition.


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Couple more useful views:




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EDIT: NEW device to test voltage over time under any condition - VERY useful....



Last edited by CALWATERBOY; 05-14-2014 at 04:41 AM.
  #7  
Old 12-07-2013, 02:19 PM
jlittle67 jlittle67 is offline
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So I replaced the battery and it's still resetting any thoughts?
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