27 48V Vehicle electrical system warning, DTC P0CA700 and/or U046900 stored in the starter/generator
control module/ECM
27 20 35 2058831/1 March 10, 2020.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A6, S6, A7,
S7, A8, and
S8

2018 - 2020

All

48V MHEV

Condition
Customer states:
 Intermittently a warning for the 48V vehicle electrical system is displayed in the instrument cluster.
Workshop findings:
The following DTC may be stored in the battery management 2 (Battery 48V) control module, J1120 (address
word 0021):
 DTC P0CA700 (hybrid battery discharge current too high static or sporadic).
And/or
The following DTC may be stored in the engine control module (ECM), J623 (address word 0001):
 DTC U046900 (invalid data received from starter/generator control module).

Technical Background
The software needs to be updated in the starter/generator control module, C29 (address word 00CC).

Production Solution
New software version in the starter/generator control module, C29 (address word 00CC).

Service
SVM Update Instructions
1. Follow all instructions in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
1. Update the starter/generator control module, C29 (address word 00CC) using the SVM action code as listed in
the table below, if necessary:

Page 1 of 3
© 2020 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.

Model

Old Hardware
Part Number

Old Software
Part Number

Old
Software
Version

New
Software
Version

SVM Code
Input

(or higher)
A6, A7, Q7,
and Q8

4N0903028
(H, J, M, and N)

4N0903028
(F, G, H, J, M,
and N)

523

527

CCA001

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:

2726

Damage Code:

0040

Labor Operations:

Software Update (Includes checking for DTCs)

0151 0000

Time stated on
the diagnostic
protocol (Max
100 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 #2058831/1

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
The following Technical Service Bulletin(s) will be necessary to complete this procedure:
 TSB 2011732, 00 Software Version Management (SVM), operating instructions.

Page 2 of 3
© 2020 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.

All part and service references provided in this TSB (2058831) 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.
©2020 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 3 of 3
© 2020 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.