A9421512063766_2

Technical Service Bulletin
94 Reverse lamp is inoperative, DTC(s) B12CB15 or B12CC15 stored in the comfort system control
module
94 21 51 2063766/2 November 30, 2021. Supersedes Technical Service Bulletin Group 94 number 21-45 dated
September 2, 2021 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
Q5, SQ5
2018 - 2020
All
Not Applicable
Q5 PHEV
2020
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
2
-
Revised Warranty (Updated Labor Operation)
1
09/02/2021
Initial publication
Customer states:
 There is a tail lamp warning displayed in the instrument cluster.
Workshop findings:
One or more of the following DTCs may be stored in the comfort system control module, J393 (address word
0046):
 DTC B12CB15 (Left back-up light bulb Open circuit/ short circuit to B+).
 DTC B12CC15 (Right back-up light bulb Open circuit/short circuit to B+).
Technical Background
The internal circuit board for the reverse lamp (located in the lamps on the rear bumper) may become separated
from the tail lamp housing. When this occurs the metal contact loses connection with the bulb socket.
Production Solution
New tail lamp implemented into production for MY21.
Page 1 of 4
© 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
If one or both of the DTCs listed above is stored, it is possible the circuit board contacts have come loose from
the housing.
Note:
Before replacing any parts (bulb, socket, housing or wiring) please inspect the reverse lamp contacts first.
1. If the bulb socket contact is
loose/pulled away from the housing,
the lamp will need to be replaced
(Figure 1).
Figure 1. Tail lamp contact loose/pulled away from housing.
2. If the bulb socket contact is flush
with the housing then no repair is
needed (Figure 2).
Continue with normal diagnosis
outside of this TSB.
Figure 2. Lamp contact has separated from housing.
Page 2 of 4
© 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
Tip: Compare the contacts to the adjacent bulb socket contacts in the lamp housing. Then inspect the
upper and lower contact on the lamp housing and using a 90 degree pick will help check if the contact is loose or
not.
Warranty
Claim Type:
 110 up to 48 Months/50,000 Miles.
 G10 for CPO Covered Vehicles – Verify Owner.
 If the vehicle is outside any warranty, this Technical Service Bulletin is informational
only.
Service Number:
9431
Damage Code:
0040
Labor Operations:
Taillight remove and reinstall
9431 19XX (One
side)
See SRT with
associated
operations
Diagnostic Time:
GFF
0150 0000
Time stated on
the diagnostic
protocol (Max 50
TU)
Road test prior to the service procedure
No allowance
0 TU
Road test after the service procedure
No allowance
0 TU
Claim Comment:
As per TSB #2063766/2
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.
Page 3 of 4
© 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
Required Parts and Tools
Always check with your Parts Department and/or ETKA for the latest information and parts bulletins.
Part Number
Part Description
Quantity
See ETKA
Fasteners, Bolts, Nuts, and Screws as needed per the
Repair Manual
See ETKA/ELSA
See ETKA
Left or right tail lamp (in bumper)
As needed
Additional Information
All parts and service references provided in this TSB (2063766) are subject to change and/or removal.
©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 4 of 4
© 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.