A2722462068368_1

Technical Service Bulletin
27 48V Battery DTC U031B00 Stored In Battery Management 2
27 22 46 2068368/1 October 27, 2022.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A3, S3, and RS 3
2022 - 2023
May Merge
48V Battery
Condition
Customer states:
No customer concern is reported; this may be found during regular service work.
Workshop findings:
Following the replacement of the 48V battery, the following DTC may be stored in Battery Management 2
J1120 (address word 0021).
•
DTC U031B00: DC/DC converter software incompatible, active/static.
Technical Background
Updated 48V Battery (Battery Management 2 J1120 (address word 0021)) with part number 5WA.915.107.B
now performs a validation check of the DC/DC converter (Voltage Converter A7 (address word 00C4)).
The software of Voltage Converter A7 (address word 00C4) with part number 5WA.959.663 did not
implement this check, therefore does not reply to the 48V battery.
Page 1 of 2
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property
rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced,
stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to
other sites, without the prior expressed written permission of the publisher.
Technical Service Bulletin
Production Solution
Not applicable.
Service
This fault should be ignored if both of the following conditions are true:
•
•
Battery Management 2 J1120 (address word 0021) has software part number 5WA.915.107.B
Voltage Converter A7 (address word 00C4) has software part number 5WA.959.663
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB (2068368) are subject to change and/or removal.
©2022 Audi of America, Inc. All rights reserved. The information contained in this document is based on the latest
information available at the time of printing and is subject to the copyright and other intellectual property rights of
Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes at any time
without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any
form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be
modified or reposted to other sites, without the prior expressed written permission of the publisher.
Page 2 of 2
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property
rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced,
stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to
other sites, without the prior expressed written permission of the publisher.