Technical Service Bulletin
53 Vehicle does not start, battery flat DTC stored (DTC U101100)
53 13 02 2034404/1 July 11, 2013.
Model(s)

Year

VIN Range

A6/A7

2012 - 2013

All

Q5

2013

All

A4/S4

2013

A5/S5

2013

All

A8

2011 - 2013

All

Vehicle-Specific Equipment

A000564 - A999999
N000174 - N999999

Not Applicable

Condition
• Customer may report that the vehicle does not start due to a discharged battery.
• DTC U101100 (supply voltage too low) is stored in the gateway, J533 (address word 19), and/or the electronic
parking brake (EPB) control module, J540 (address word 53).
• According to the test plan “19-Read Data Bus Keep-Awake Manager”, the EPB control module kept the data
bus active for prolonged periods of time.

Technical Background
The EPB switch appears to be permanently operating (applying or releasing the parking brake) due to an internal
mechanical issue or because it is jammed or blocked by debris or by a foreign object.
Test plan “19-Read Data Bus Keep-Awake Manager”, identifies the EPB control module as keeping the data bus
active for prolonged periods of time.
Example of data from test plan “19-Read Data Bus Keep-Awake Manager”:
Keep-awake manager in MVB: XXX
On 23.09.2013 at 12:33:43 O'clock:
The control module with diagnostic address 53 kept the bus awake for 20.6 hours.

© 2013 Audi of America, Inc.

Page 1 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
Production Solution
New EPB software prevents discharge of the battery due to a faulty or jammed EPB switch:
• A8 (D4), A6 (C7), A7 (C7): Vehicles produced from week 22/2013 new software (SW0014) for EPB control unit
with part number 4H0.907.801.G
• A4 (B8), A5 (B8), Q5 (B8): Vehicles produced from week 22/2013 new software (SW0004) for EPB control unit
with part number 8K0.907.801.M

Service
1. Confirm that the EPB control module, J540 (address word 53), has been identified in test plan “19-Read Data
Bus Keep-Awake Manager” as keeping the data bus active for prolonged period of time.
2. Check if the EPB switch is jammed or blocked by debris or by a foreign object.
3. If the EPB switch is not jammed or blocked, replace the EPB switch. Do not replace the EPB control module.

© 2013 Audi of America, Inc.

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
Warranty
Claim Type:

Use applicable claim type. If vehicle is outside any warranty, this Technical Service Bulletin
is informational only.

Service Number:

4662

Damage Code:

0010

Labor Operations:

Multimedia display unit remove & reinstall

9195 1900

30 TU

6817 1901

130 TU

(C7,Q5,A4,A5)
Console remove & install (A8)

Diagnostic Time:

Remove and install EPB switch (C7,Q5,A4,A5,A8) 4662 1950

10 TU

GFF

0150 0000

Time stated on
diagnostic
protocol (Max 100
TU)

Road test prior to service procedure

No allowance

0 TU

Road test after service procedure

No allowance

0 TU

Technical diagnosis at dealer’s discretion
(Refer to Section 2.2.1.2 and Audi Warranty Online for DADP allowance details)
Claim Comment:

As per TSB #2034404/1

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.

Required Parts and Tools
Part Number

Part Description

Quantity

Refer to ETKA

Switch for electric-mechanical parking brakes

1

Additional Information
All parts and service references provided in this TSB (2034404) are subject to change and/or removal. Always
check with your Parts Department and service manuals for the latest information.

© 2013 Audi of America, Inc.

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.