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      01-31-2013, 09:51 PM   #19
Mike Benvo
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Drives: 08 E90 M3 / 400whp Turbo 7
Join Date: Apr 2008
Location: SoCal

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2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
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Quote:
Originally Posted by pbonsalb View Post
Off at 12.2 is low. 12.6 is a fully charged battery with the car off. Of course with the car on, the alternator output will show up as the voltage, so the 13.8 does not mean much. I would be concerned about the 12.2.
It's not ideal but not a concern at 12.2.

12.2 is strong enough. My car has had between 12.0 and 12.2 for over a year and it's just fine.

Sometimes it will drop slightly under that. 11.8ish and under is when these cars get a little upset.

With the car on, it does mean much. It was a test to make sure his alternator was working properly, which at 13.8, it is.

OP: You should find a tool to read the freezeframe data of the fault code. That way you can see the conditions under which that fault was triggered.
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Last edited by Mike Benvo; 01-31-2013 at 09:57 PM.
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