A9421542064418_3

Technical Service Bulletin
94 Tail lamp warning, DTC B16D4F4, B16D5F4, B16D6F4, B16D7F4 is stored - Repair Authorization
94 21 54 2064418/3 December 15, 2021. Supersedes Technical Service Bulletin Group 94 number 21-50 dated
November 19, 2021, for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A8/S8
2019 – 2022
All
Not Applicable
A8 PHEV
2021 – 2022
All
Not Applicable
Condition
Customer states:
 A turn signal or tail lamp warning is displayed in the instrument cluster. However, the lamps work
normally.
Workshop findings:
One or more of the following DTCs may be stored in the comfort control module, J393 (address word 0046):
 DTC B16D4F4 (left tail lamp 1 Turn signal light defective).
 DTC B16D5F4 (left tail lamp 2 Turn signal light).
 DTC B16D6F4 (Right rear tail lamp 1 Turn signal).
 DTC B16D7F4 (Right rear tail lamp 2 Turn signal light defective).
Technical Background
Various parts have been replaced under warranty for the condition noted above, but no issues were identified
with these parts. In an effort to gain information on the DTC codes for the vehicles listed above, we are
asking that you contact the Audi Technical Assistance Center (TAC) before replacing any parts. This will
assist us in diagnosing any potential issues with the condition noted above.
Production Solution
No changes to production have been made, as no issue has been identified.
Page 1 of 3
© 2021 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
Service
Audi of America is requesting your cooperation in supplying us with technical information regarding this
condition.
1. Verify the condition.
2. For the first service visit:
 Confirm the faults stored match above and upload the log to paperless.
 Inspect the faulted tail lamp(s) for loose connections or damage.
 Question the customer on how to duplicate, supply any photos they may have, clarify the frequency of
the warnings, the driving conditions, and any other helpful details to aid in diagnosis. The attached
questionnaire can be used as a guide.
 If the concern is unable to be duplicated and the warning has only occurred once for the customer,
clear all faults and release the vehicle. Do not replace any parts.
 Explain to the customer the warning will likely not occur again. If the warning returns, follow step 3
below.
3. For return visits or multiple occurrences:
 Confirm the faults are the same as the first visit and upload the GFF log to paperless.
 Fill out the attached questionnaire.
 If the vehicle is within the New Vehicle Limited Warranty, contact a TAC consultant before proceeding.
Please attach the completed questionnaire and diagnostic log to the TAC ticket/TAC Web Ticket.
Warranty
This TSB is informational only and not applicable to any Audi Warranty.
Required Parts and Tools
Additional Information
Page 2 of 3
© 2021 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
All parts and service references provided in this TSB (2064418) 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.
©2021 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 3 of 3
© 2021 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.