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Old 10-23-2012, 09:31 AM
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Overvoltage?

Hi all! I need help here!

Recently my red battery light in instrument cluster lit up several times, each time it lit up, it only stayed for several minutes and went away. I used DIS to check the fault code today, it showed 7 times of 'overvoltage' (14.6V on alternator output, 13.8v battery) and 1 time no communication with DME.

Any idea on this? What is the problem? Is the alternator dying or the battery dying? Thanks for help!
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Old 10-23-2012, 09:39 AM
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Doesn't DIS have a test plan to use?

However, I would think its a bad alternator/regulator causing the over voltage and not a bad battery.
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Old 10-23-2012, 10:40 AM
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Quote:
Originally Posted by TwinsPoppa View Post
Doesn't DIS have a test plan to use?

However, I would think its a bad alternator/regulator causing the over voltage and not a bad battery.
Yes, i tested the alternator, but it worked well. Since the battery light was out when I was testing/checking it with DIS, so everything worked well. However, the fault memory was there.
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Old 10-23-2012, 10:49 AM
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Quote:
Originally Posted by rogerkiu View Post
Yes, i tested the alternator, but it worked well. Since the battery light was out when I was testing/checking it with DIS, so everything worked well. However, the fault memory was there.
Got it. From what I remember, the battery light is not really a light to indicate a bad battery but something is wrong with the charging system. So, probably your alternator/regulator is going bad.

When I had a bad battery, the battery idiot light never came on. However, I didn't check if I had over voltage problems and don't remember if I had any codes related to that issue.

Maybe try to use DIS when the issue happens again, if you have the opportunity.
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Old 10-23-2012, 11:05 AM
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You said it was only on occasion? Sounds like the regulator is going bad.
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Old 10-23-2012, 11:56 AM
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Over voltage is caused by a bad voltage regulator. It can fry your electronics.
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Old 10-23-2012, 08:09 PM
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Thanks for comment! l think l must deal w/ it asap.
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