48 Red steering warning light is on, DTC C10AC07 is stored in the power steering control module
48 21 10 2064018/2 September 2, 2021. Supersedes Technical Service Bulletin Group 48 number 21-07 dated
July 15, 2021 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A6, A7, A8,
Q7, Q5,
SQ5, SQ7,
and Q8

2019 - 2021

All

Not Applicable

2020 - 2021

All

Not Applicable

2021

All

Not Applicable

A6 allroad,
S6, RS 6,
S7, RS 7,
Q5 PHEV,
SQ8, RS
Q8, Audi etron quattro,
and Audi etron
Sportback
A6 Avant,
RS 6 Avant,
A7 PHEV,
Q5
Sportback,
and SQ5
Sportback

Condition
REVISION HISTORY
Revision

Date

Purpose

2

-

Revised Condition (Added Note)

1

07/15/2021

Initial publication

Customer states:
 The red steering warning lamp lights up in the instrument cluster.
 Steering is heavy.
Workshop findings:
 The concern can be reproduced.
The following DTC is logged in the power steering control module, J500 (address word 0044):
 DTC C10AC07 (Steering Malfunction) with symptom code 5258760.

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.

Note:
 If only the steering heavy concern is present (without DTC and/or warning in the cluster), proceed with the
SVM update as described in the Service procedure and reevaluate the vehicle.
 If there are other DTCs logged in the J500, proceed with GFF/test plans to solve the issue.

Technical Background
The software for the power steering control module, J500 (address word 0044) needs to be updated.

Production Solution
New software implemented in production.

Service
Proceed as follows:
1. Perform a visual check of the steering rack and steering boots and check if steering wheel can be turned
freely.
2. Check the “Control module temperature” value of address word 0044. The temperature should be >10°C at
the live measured value before the software update.

SVM Update Instructions
3. Follow all instructions in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
4. Update the power steering control module, J500 (address word 0044) using the SVM action code 44A030 for
parametrization of the control module.
Note:
The software version will not change.

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.

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:

4835

Damage Code:

0040

Labor Operations:

Remove and install front cover

5192 1900 (Audi
e-tron quattro
and Audi e-tron
Sportback only)

See SRT with
associated
operations

Remove and install noise insulation

1082 1900

See SRT with
associated
operations

Check steering rack for damage and free
movement

4835 0199

20 TU

Software Update (Includes checking for DTCs)

0151 0000

Time stated on
the diagnostic
protocol (Max 50
TU)

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

Diagnostic Time:

Claim Comment:

As per TSB #2064018/2

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.

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 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.

All part and service references provided in this TSB (2064018) 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
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.