A9123472072008_1

Technical Service Bulletin
27 48V Service info: message "Electrical system: fault" in instrument cluster - event memory entry
B200094 (00C4)
91 23 47 2072008/1 November 15, 2023.
Model(s)
Year
A6, A7, A8, and
Q8
2019 – 2024
A6 allroad, S6,
S7, S8, Q7, SQ7,
2020 – 2024
Q8, SQ8, and
RS Q8
A8 e quattro
2020 – 2021
RS 6 Avant, and
RS 7
2021 – 2024
A7 e quattro
2021 – 2022
VIN Range
Vehicle-Specific Equipment
All
48V Battery
Condition
Customer statement:
• Customer states “Electrical system: fault. See owner’s manual”.
• The following message is shown in the instrument cluster: “Electrical system: fault. See owner’s manual”. In
addition, the battery symbol lights up in yellow or red.
• A yellow warning lamp related to the electrical system shown in the instrument cluster during driving (Figure 1).
Figure 1. Yellow electrical system warning lamp.
Workshop findings:
The following DTC is logged in the voltage converter (diagnostic address 00C4):
DTC B200094: Faulty control module, passive/active
© 2023 Audi of America, Inc.
Internal
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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
Technical Background
A functional issue exists in the voltage converter.
Production Solution
Not applicable.
Service
If the above entry is logged, replacing the belt-driven starter-alternator C29 will not fix the complaint.
The failure will occur again if the belt-driven starter-alternator is replaced.
• The cause of the DTC must be determined via Guided Fault Finding.
• Claims for replaced belt-driven starter-alternators will be subject to review.
Warranty
This TSB is informational only and not applicable to any Audi Warranty.
Additional Information
All part and service references provided in this TSB (2072008) are subject to change and/or removal. Always
check with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the
Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
©2023 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.
© 2023 Audi of America, Inc.
Internal
Page 2 of 2
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.