Technical Service Bulletin
01 MIL on (DTC P0456 or DTC P0442 (EVAP emission control system leak detected))
01 13 38 2035519/1 October 23, 2013.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

Q7

2013 - 2014

All

Not Applicable

Condition
• MIL on.
• One of the following DTCs is stored in the engine control module (ECM), J623 (address word 01):
• DTC P0456 (EVAP Emission Contr. Sys. (very small leak) Leak Detected)
• DTC P0442 (EVAP Emission Contr. Sys. (small leak) Leak Detected)
• Drivability is not affected.

Technical Background
The leak detection pump (LDP) is a vacuum-driven, ECM-controlled, diaphragm pump. In order for the LDP to
operate, the engine must be running and vacuum must be applied to the vacuum switch on the LDP. The LDP
pressurizes the EVAP system and monitors any pressure drop within a specified amount of time in order to detect
a leak.
DTC P0456 or DTC P0442 can be stored due to either of the following conditions:
• Static or sporadic air leaks in the EVAP system.
• Static or sporadic air leaks in the LDP.

Production Solution
Not applicable.

© 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
Service
1. Visually inspect the EVAP system for any loose connections or damaged parts. If found, repair the loose
connections and/or replace the damaged parts.
2. Pressurize the EVAP system using the KLI9210 Smoke/Pressure test:
• Clamp off the hose that leads to the LDP air
filter (Figure 1). Use hose clamps up to 25 mm
diameter (Figure 2).
• Pressurize the EVAP system to 12 inch/water
(30mbar), and check pressure loss over time.

Figure 1. Hose leading to LDP air filter (A).

Figure 2. Tool -3094-, hose clamps.
3. If remaining pressure after 3 minutes is 9 inch/water (22.4 mbar) or higher, the system has no leaks:
• Replace the LDP with the latest part number (see parts catalog).
If remaining pressure after 3 min is lower than 9 inch/water (22.4 mbar), the system has a leak.
• Locate the leak with the smoke generator function of the Evaporative Emissions Tester KLI9210 and repair
as necessary.
© 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:

2048

Damage Code:

0040

Labor Operations:

EVAP system pressure test

2048 0199

70 TU

Leak detection pump remove & reinstall

2048 1950

20 TU

Rear wheel housing liner remove & reinstall

6676 1900

40 TU

GFF – Checking and clearing fault codes included in
existing labor operations

0150 0000

Time stated on
diagnostic
protocol (Max
100 TU)

Diagnostic Time:

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 #2035519/1

Required Parts and Tools
Part Number

Part Description

Quantity

7L8906271A

Leak detection pump*

1

*Always check with your Parts Department and service manuals for the latest information.
Tool Number

Tool Description

3094

Hose clamps

Additional Information
All parts and service references provided in this TSB (2035519) 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.