Update: error3 below is not an OBC error - so this case is not a second OBC failure. Turns out it was not a failure at all.
Have seen a report of a car with a second OBC failure on the German forum. This is strange. The likelihood of a rare error happening multiple times to the same cars seems too low to be chance. I get the feeling this error (if it is a single error) has not been fully fixed or fully understood. There also seems to be a new case in California (and another. Now 3 in California we know about) So its not a geographical issue.
Details of car with multiple errors. Built March 2015. see http://www.goingelectric.de/forum/kia-soul-ev/er-will-nicht-mehr-laden-t15193.html
Error 1: "Park the car and check battery power" October 2015. - Supposedly fixed with a software update. (This may not be the OBC error - if so this driver is unlucky enough to have two different rare errors)
Error2: " it will not charge, the three blue lights blink twice and then nothing" February 2016 - Fixed with new OBC
Error3: "unfortunately broken again" May 2016 (Does this mean the new OBCs also fail!)
Update: error3 is not an OBC error, so this case does not invalidate the idea that version 2 of the OBC fixes the Charging Fault error. It does strengthen the idea that there is more than 1 error involved in this problem thread. What causes this new error is unknown. Kia's mechanics have taken this car apart to find out.
Update2: error3 is not an OBC error. Turns out it was the charge timer that was inadvertently set and the car was just waiting to start. The owner and mechanics did not pay attention to the flashing middle light in the charging panel. This car was taken apart for no reason.
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For anyone who does have an OBC error, could you report the version number. There are two stickers on the OBC. The one at the front says Daewoo and has a date. The sticker at the back says Mando and has the version number. See photo below - taken by Nibularr