A9421502064418_2

94 Tail lamp warning, DTC B16D4F4, B16D5F4, B16D6F4, B16D7F4 is stored - Repair Authorization
94 21 50 2064418/2 November 19, 2021. Supersedes Technical Service Bulletin Group 94 number 21-46 dated
September 7, 2021 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A8
2019 - 2022
All
Not Applicable
A8 PHEV
2020 - 2022
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
2
-
Revised header (Added Model Years)
Revised Service (Revised procedure)
1
09/07/2021
Initial publication
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.
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.
Production Solution
No changes to production have been made, as no issue has been identified.
Service
Audi of America is requesting your cooperation in supplying us with technical information regarding this condition.
1. Verify the condition.
2. For first service visit:
 Confirm the faults are the same as the first visit and upload diagnostic log to GFF paperless. Upload the
GFF log to paperless.
 Question customer how to duplicate, supply any photos they may have, clarify the frequency of the
warnings, 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 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.
Additional Information
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
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.
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.