Technical Service Bulletin
45 PSS ABS/ESC control unit cannot be reached "DTC U012100 ABS Control Module no communication"
stored
45 24 41 2073483/1 March 28, 2024.
Model(s)

e-tron quattro

Year

VIN Range

Vehicle-Specific Equipment

All

Not Applicable

2019
2021 - 2023

e-tron Sportback
quattro

2020 - 2023

e-tron S

2022 - 2023

Q8 e-tron, Q8 etron Sportback,
SQ8 e-tron, and
SQ8 e-tron
Sportback

2024

Condition
This PSS refers only to e-tron, and Q8 e-tron variant vehicles with Software Level 321 in the ABS control
unit -J104-.

If the vehicle is equipped with a different version of software level, please refer to TSB 2072977.
Customer states:
• There is reduced braking assistance and various warning lamps appearing in the instrument cluster.
Workshop findings:
• ABS/ESC Control unit -J104- (Diagnostic address 0003) cannot be reached in communication.
• The DTC "U012100 (Symptom Code 19875), ABS Control Module no communication" is also logged in the
diagnostic address 0001.

Technical Background
Control unit -J104- has performed a restart. After this, the electromechanical brake servo remains on the hydraulic
fallback level and no bus communication takes place. This results in driver messages from other vehicle systems
being displayed. This restart only occurs in very rare exceptional cases.

Production Solution
© 2024 Audi of America, Inc.
Internal

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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
Not applicable.

Service
• Diagnose the vehicle according to the instructions listed below.
• If the customer’s vehicle condition matches the condition listed in the Technical Background of this PSS,
explain to the customer that a solution is expected to be available by the end of the 3rd quarter of 2024
(subject to change) and that no repairs are necessary at this point.
• Do not replace any components for this condition since this will not resolve the customer’s concern.
• Create a PSS record in the PSS application through the Pending Service Solutions (PSS) link in AccessAudi
(under Related Links >> Service).
Vehicles equipped with ABS/ESC control unit -J104- with software version SW 321.
• Disconnect 12V battery from the vehicle for 5 minutes and then check the accessibility of the control unit J104- in the diagnosis. DTCs with the designation "P060A00, Control module internal processor monitoring
malfunction" may be logged in the control unit as passive/intermittent.
• Delete these and all other intermittent DTCs in other control units and check control unit -J104- again after
switching the ignition off and back on.
• When communication is correct and there are no other DTCs in address 0003, the vehicle is then ready for
use again and can be released.
• If additional DTCs are stored in address 0003, please follow GFF instructions.

Warranty
Claim Type:

• 110 Up to 48 Months/50,000 Miles.
• G10 for CPO Covered Vehicles – Verify Owner.
• If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.

Service Number:

4545

Damage Code:

0040

Labor Operations:

Loosen and secure earth strap

9785 0999

10 TU

Check vehicle (bus sleep mode)

0689 0199

10 TU

GFF

0150 0000

Time stated on
the diagnostic
protocol

Diagnostic Time:

(Max 30 TU)
Road test prior to the service procedure
© 2024 Audi of America, Inc.
Internal

No allowance

0 TU

Page 2 of 3

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
Road test after the service procedure
Claim Comment:

No allowance

0 TU

As per TSB 2073483/1

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 part and service references provided in this TSB (2073483) 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.
©2024 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.

© 2024 Audi of America, Inc.
Internal

Page 3 of 3

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.