R56
07-02-2024, 03:16 PM
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2010 cooper s 2e3c alternator code
Anyone have and experience diagnosing a 2E3C alternator code on a 2010 cooper s? Any help would be appreciated.
07-02-2024, 03:28 PM
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Location: Houston, Texas
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Symptoms?
07-02-2024, 03:31 PM
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Quote:
Originally Posted by
Maybe, maybe not
Symptoms?
cranks and starts fine. Alternator’s putting out 14.1 - 14.2 volts
07-02-2024, 03:45 PM
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Location: Houston, Texas
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2e3c is not an alternator fault code.
Last edited by Maybe, maybe not; 07-02-2024 at 06:27 PM .
07-02-2024, 09:07 PM
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Quote:
Originally Posted by
Maybe, maybe not
2e3c is not an alternator fault code.
07-02-2024, 09:16 PM
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Your posted voltages do not reveal a charging issue, though you did not mention the test conditions.
07-02-2024, 09:25 PM
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Quote:
Originally Posted by
Maybe, maybe not
Your posted voltages do not reveal a charging issue, though you did not mention the test conditions.
yes. It clears and doesn’t return until I start the car again. New battery installed and coded and alternator was replaced about 12000 miles ago with OE alternator.
07-02-2024, 09:36 PM
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Any voltage deviations under the three conditions shown in post #4.
07-03-2024, 05:09 AM
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Quote:
Originally Posted by
kstubbs77
yes. It clears and doesn’t return until I start the car again. New battery installed and coded and alternator was replaced about 12000 miles ago with OE alternator.
How long after changing the alternator did the code start showing up?
https://bmwfault.codes/XMLDiagView?d...QANwA4ADAANAA=
Sounds to me like the alternator is the wrong amp size, and is putting too much voltage into the system.
07-03-2024, 09:35 AM
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Quote:
Originally Posted by
Maybe, maybe not
Any voltage deviations under the three conditions shown in post #4.
Did the test as described and had 12.2v with key off and maintained 14.4 volts throughout the test with car running.
07-03-2024, 10:01 AM
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Quote:
Originally Posted by
kstubbs77
Did the test as described and had 12.2v with key off and maintained 14.4 volts throughout the test with car running.
It's not causing 2E3C, but your battery voltage is clearly too low. You should charge the battery.
Also do the other two tests while monitoring the system voltage in an attempt to expose a charging issue.
Last edited by Maybe, maybe not; Yesterday at 06:25 AM .
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