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BMW 3-Series (E90 E92) Forum
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N55 problems
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06-30-2016, 06:23 PM | #4 |
BMWCCA 149159
38
Rep 847
Posts |
12.6 VDC is fully charged battery.Your alternator should gradually ramp up to 14.5VDC then taper off as your battery receives a charge. While running it should read 13.1VDC. 12.3VDC isn't all that bad but could well be a battery issue.
Check over a 5 minute period the output of the alternator. If it doesn't ramp up you might have a failing alternator. If it does and your battery doesn't get above 12.3VDC then most likely a battery issues... |
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07-02-2016, 07:58 AM | #6 |
New Member
4
Rep 13
Posts |
So tested the alternator again all seems fine charging at 14v when checked over a longer period of time also changed battery as precaution still gettinh codes also noticed water pump is on pretty much all the time even when car is switched off and every time i unlock it.
These are the current codes that wont reset |
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07-02-2016, 10:10 AM | #7 |
Lieutenant
147
Rep 500
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Sounds like some wiring issue. First thing you can check is that there's a small wire connected to the negative battery cable at the battery. That's the IBS sensor wire.
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