Technical Service Bulletin
01 MIL on (DTC P0456 (EVAP emission control system small leak detected))
01 16 51 2040924/1 January 13, 2016.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

Q7

2014 - 2015

All

3.0 TFSI

Condition
• MIL on.
• DTC P0456 (EVAP Emission Contr. Sys. (very small leak) Leak Detected) is stored in the engine control
module (ECM), J623 (address word 01).
• 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 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.

© 2016 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. Connect KLI9210 and tune knob to “Hold”. Before proceeding, have a stopwatch ready.
3. Perform basic settings 70/71 test. Monitor the pressure increase and record the max value. (The max pressure
should be between 9-11 inch/water.)
4. As soon as the pressure stops increasing, start the stopwatch and turn the ignition off.
5. If the pressure drops within 6 minutes by 4 inch/water during test (for example, max pressure 10.5
inch/water drops to 6.5 inch/water or less after 6 minutes):
1. Have tool 3094 ready to be installed and perform basic settings 70/71 test again.
2. As soon as max pressure is reached, install tool 3094 between the filter and LDP to prevent any air flow:
• If the pressure now holds, replace LDP.
• If the pressure drops at the same rate, find the leak using a smoke tester and/or through the application
of soapy water on all lines and connections (Note that a small leak is more likely to be found with soapy
water and a larger leak with the smoke tester). Repair as needed.
If the pressure holds during test:
• If this is the first time DTC P0456 has appeared for this vehicle, clear the DTC and release the vehicle.
• If the vehicle has been in with DTC P0456 before, contact TAC for instructions.

© 2016 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 (If necessary)

2048 1950

20 TU

Rear wheel housing liner remove+reinstall (If necessary)

6676 1900

40 TU

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

0150 0000

Time stated on
diagnostic
protocol

Diagnostic Time:

(Max 100 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 #2040924/1

Required Parts and Tools
Part Number

Part Description

Quantity

7L8906271A

Leak detection pump*

1 (If necessary)

*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 (2040924) are subject to change and/or removal. Always
check with your Parts Department and service manuals for the latest information.

© 2016 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.