Technical Service Bulletin
91 SOS Emergency call function deactivated message in the cluster, DTC U153E00 is stored in the
telematics module
91 23 09 2055945/13 June 29, 2023. Supersedes Technical Service Bulletin Group 91 number 22-31 dated
September 23, 2022, for reasons listed below.
Model(s)

Year

A4, A4 allroad,
S4, A5, A5
Cabriolet, A5
Sportback, S5,
S5 Cabriolet, S5
Sportback, RS 5,
RS 5 Sportback,
and e-tron
quattro

2019

A6, A7, A8, Q5,
2019 – 2020
SQ5, Q7, and Q8
A6 allroad, S6,
S7, A8 e quattro,
S8, e-tron
Sportback, Q5 e
quattro, SQ7,
SQ8, and RS Q8

VIN Range

Vehicle-Specific Equipment

All

ConBox Low

2020

Condition
REVISION HISTORY
Revision

Date

Purpose

13

-

Revised Condition (added DTC code)
Revised Technical Background (updated to reflect SVM fix)
Revised Service (changed to SVM update)
Revised Warranty (updated to reflect SVM update)

12

09/23/2022

Revised Warranty (Updated Service Number)

11

09/12/2022

Revised header (filtered out vehicles with gateway SW 01XX)

Page 1 of 5
© 2023 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
Customer states:
• The warning message “SOS Emergency call
function deactivated” is seen in the instrument
cluster (Figure 1 or 2).

Figure 1. SOS warning in the instrument cluster.

Figure 2. SOS warning in the instrument cluster.
Workshop findings:
The following DTC is stored in the Emergency Call Module and Communication Unit (ConBox) -J949- (address
word 0075):
•

DTC U153E00: Emergency call module and communication unit Recognition in mobile communications
network not possible.

Technical Background
The warning message is generated by the telematics control module (ConBox Low for MY19), J949 (address
word 0075) and is primarily seen in two different scenarios:
• When there is a hardware or software malfunction of the control module.
• When there is a problem connecting to the Mobile Network Operator (AT&T).
For problems related to the cellular network (MNO), the following DTC may be found in in the telematics control
module, J949 (address word 0075):

Page 2 of 5
© 2023 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
• DTC U153E00 (Emergency call module and communication unit Recognition in mobile communications
network not possible).
This DTC will trigger the warning message in the cluster immediately when the signal to the MNO (AT&T) is
lost. However, depending on how long of a period the signal loss occurs, the vehicle may require a full sleep cycle
in order for the DTC to change to sporadic. The warning message in the cluster will only turn off when the DTC
changes to sporadic.
Example Customer Scenarios:
• When a customer is on a long drive through an area where AT&T has little-to-no service, the warning message
can occur. If the customer drives the vehicle for 15-30 minutes with no service, then the vehicle may take a full
hour before it retries to connect to the AT&T network. This is a requirement of AT&T. When the customer
drives the vehicle back into an area of service, the SOS light may remain off or red until the vehicle has been
in a service area for up to one hour or until the vehicle is turned off long enough for the vehicle systems to go
through a sleep cycle.
• If the customer operates the vehicle continuously in an area with no service, then each time the vehicle starts
the warning message will be present. This is true of when the vehicle is operated outside of the United States
of America (Canada, Mexico, or overseas) since there are no supported cellular service providers in these
areas.

Production Solution
Certain models for MY20 with ConBox High will receive new hardware and software that resolves this concern. All
MY21 vehicles will receive the solution with the ConBox High integration in series production.

Service
SVM Update Instructions

Always use DoIP when flashing a control module via ODIS in supported vehicles.
To Activate DoIP, select Administration>>General>>GFF Process>>DoIP communication>>Only allow
DoIP communication
This setting will automatically reset when the diagnostic session is ended.
You can tell if DoIP is active by observing a red LED on the VAS 6154(A)
1. Follow all instructions in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
2. Update the telematics control module, J949 (address word 0075) using the SVM action code as listed in the
table below, if necessary:

Page 3 of 5
© 2023 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
Model

Old
Old
New
New
SVM Code Input
Software
Software Software
Software
Part Number Version
Part Number Version
(or higher)

A4/A5/A6/A7/A8/Q5/Q7/Q8/e-tron
Quattro

4K1035283C

0233

4K1035283K

(or
higher)
0420

75A027

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:

9145

Damage Code:

0039

Labor Operations:

Software Update

0151 0000

Time stated
on the
diagnostic
protocol
(Max 85 TU)

Diagnostic Time:

GFF

No allowance

0 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 2055945/13
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.

Additional Information
All parts and service references provided in this TSB (2055945) 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.

Page 4 of 5
© 2023 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
©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.

Page 5 of 5
© 2023 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.