91 No diagnostics communication to the telematics control module
91 21 81 2056076/12 March 15, 2021. Supersedes Technical Service Bulletin Group 91 number 21-77 dated
March 2, 2021 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A4, S4, A4
allroad, A5,
A5
Cabriolet,
A5
Sportback,
S5, S5
Cabriolet,
S5
Sportback,
RS 5, and
RS 5
Cabriolet

2019

All

ConBox Low

A6 allroad,
RS 7, SQ8,
RS Q8, and
Audi e-tron
Sportback

2020

All

ConBox Low

A6, S6, A7,
S7, A8, S8,
Q5, SQ5,
Q7, SQ7,
Q8, and
Audi e-tron
quattro

2019 - 2020

All

ConBox Low

Condition
REVISION HISTORY
Revision Date

Purpose

12

-

Revised header (Removed vehicles that don’t apply)

11

03/02/2021

Revised Service (Updated Step 7)
Revised Required Parts and Tools (Added table)

10

11/10/2020

Revised header (Added ConBox High vehicles (MY20/21))
Revised Condition (Updated wording to clarify options)

Page 1 of 6
© 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.

Customer states:
 An SOS Warning might be displayed in the
instrument cluster (Figure 1).

Figure 1. Emergency call malfunction warning.
Or
 Connectivity features like remote locking and unlocking are not working.
Or
 No diagnostics communication can be established to the control module for emergency call module and
communication unit (telematics control module or ConBox), J949 (address word 0075) during vehicle
diagnostics.
Workshop findings:
 No diagnostics communication can be established with the control module for emergency call module and
communication unit (telematics control module or ConBox), J949 (address word 0075).
 Multiple DTCs regarding communication with the telematics control module may be stored in other control
modules. However, DTCs are not required to be stored for this TSB to be applicable.
Note:
This TSB only applies to vehicles that have no diagnostics communication to the telematics control module,
J949 (address word 0075). If DTC U153E00 is entered in the telematics control module, J949 (address word
0075), please reference TSB 2055945: 91 SOS Emergency call function deactivated message in the cluster,
DTC U153E00 stored in the telematics module.

Technical Background
A software bug can cause the control module to freeze during cold start.

Production Solution
Not applicable.

Page 2 of 6
© 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.

Service
1. Remove and unplug the telematics control module, J949 (address word 0075) according to the repair manual
in Elsa.
2. Open the battery compartment of the
telematics control module, J949
(address word 0075) and disconnect
the backup battery (Figures 2 - 3).

Figure 2. Backup battery compartment location.

Figure 3. Backup battery connector (no release mechanism).

Page 3 of 6
© 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.

3. Remove the fuse supplying power to the data bus on board diagnostic interface, J533 (address word 0019).
Please consult Elsa or the vehicle’s manual as to the fuse location for the specific model you are working on.

Note:
The vehicle is not able to be moved under its own power while J533 is without power. Please make sure the
vehicle is parked in a suitable location for the duration of the procedure.
4. Leave the battery and Gateway fuse disconnected for approximately 20 minutes.
5. Reinstall the backup battery back into the telematics control module, J949 (address word 0075).
6. Reinstall the telematics control module, J949 (address word 0075) back into the vehicle.
7. If ODIS still cannot connect to the telematics control module, J949 (address word 0075) or it is a repeat
repair, then follow the ODIS test plan and replace the telematics control module with part number 992 035
286 C.
In the case of a repeat repair, please mention the previous claim ID in the claim comments.

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:

9170

Damage Code:

0039

Labor Operations:

Telematics control module remove + reinstall

9170 1950
Or
9170 1900
Or
9170 1952

Remove and reinstall the telematics control
module backup battery

9170 9999

Remove and reinstall the fuse for the Data Bus
on Board Diagnostic Interface

9035 9999

See SRT
and
associated
predecessor
by model

5 TU

5 TU

Page 4 of 6
© 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.

Diagnostic Time:

Claim Comment:

GFF

0150 0000

Time stated
on the
diagnostic
protocol
(Max 20 TU)

Road test prior to the service procedure

No allowance

0 TU

Road test after the service procedure

No allowance

0 TU

As per TSB #2056076/12

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.

Required Parts and Tools
The part numbers mentioned in this TSB are different than the ones listed in ETKA. Only use parts listed in this
TSB, this includes superseding part numbers!
Part Number

Part Description

Quantity

See ETKA

Fasteners, Bolts, Nuts, and Screws as needed per the
Repair Manual

See ETKA/ELSA

992035286C

Telematics Control Module (if required)

01

Additional Information
The following Technical Service Bulletin(s) may be necessary to complete this procedure:
 TSB 2055945, 91 SOS Emergency call function deactivated message in the cluster, DTC U153E00 stored in
the telematics module.
 Owner’s Manual: Fuses.
 Elsa: Wiring Diagrams >> Component Locations >> Fuses.
All part and service references provided in this TSB (2056076) 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

Page 5 of 6
© 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.

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 6 of 6
© 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.