20 MIL on or difficulty refueling, DTC P045100, P044100, P202500, and/or P045300 stored in the ECM
20 19 23 2050276/3 November 15, 2019. Supersedes Technical Service Bulletin Group 20 number 18-99 dated
February 20, 2018 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A6, A7

2016 - 2018

All

3.0T

Condition
REVISION HISTORY
Revision

Date

Purpose

3

-

Revised title
Revised header (Added MY2018 and DTCs)
Revised Condition (Added DTCs)
Revised Service (Added steps and photos)
Revised Warranty (Updated and added Labor Operation)
Revised Required Parts and Tools (Added parts and updated)

2

02/20/2018

Revised Service (Updated Step 3)

1

02/02/2018

Initial publication

Customer has one or more of the following concerns:
 The customer has problems filling the fuel tank (fuel nozzle keeps clicking off).
 MIL may be illuminated.
Workshop findings:
 Water and/or ice is found in the EVAP canister reservoir and natural vacuum leak detection (NVLD or J909)
pressure switch.
One or more of the following DTCs is found in the engine control module (ECM), J623 (address word 0001):
 DTC P045100 (pressure sensor for the tank ventilation system, implausible signal).
 DTC P044100 (tank ventilation system, through-flow faulty).
 DTC P202500 (Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Performance).
 DTC P045300 (EVAP Emission Contr.Sys.Press.Sensor High Input).

Page 1 of 10
© 2019 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.

Technical Background
Water enters through the tank ventilation system. The water can flow through the NVLD pressure switch into the
EVAP canister and freeze in cold temperatures.

Production Solution
Not applicable.

Service

Figure 1. How to determine which steps to take Version 1 (~4mm gap) or Version 2 (gap less than 2mm).
Version 1 (A6 only):
1. If the updated wheel liner has not yet been installed. Then install the updated wheel liner, which has closed
slots around the NVLD filter.
 Remove the EVAP canister, ventilation tube, and NVLD pressure switch.
 Remove all components mounted on the EVAP canister.

Page 2 of 10
© 2019 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.

2. Weigh the EVAP canister:
 If it weighs more than 2650
grams, replace the EVAP canister
+ attached filter, ventilation tube
(Figure 2), and NVLD pressure
switch (J909).
 If it weighs less than 2650 grams,
replace the ventilation tube, and
the J909.

Figure 2. Ventilation tube of the EVAP canister.

Version 2:
If updated wheel liner has already been installed at previous repair or in the factory, the NVLD filter needs to be
relocated into the engine compartment to prevent moisture entering the EVAP system, under extreme customer
use conditions.
1.

Replace the EVAP canister only
if weight is greater than 2650
grams.


Install a new J909.

 Install the NVLD filter (new
part number, Version 2) in the
engine compartment on the
left frame rail just in front of
the ABS module, secure with
M6 nut. (Figure 3).

Page 3 of 10
© 2019 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.

Figure 3. Installing the new NLVD filter.
2.

Connect the filter to the 5/8” ID
rubber hose via 1x plastic elbow
and 1x rubber elbow (Figure 4).

Figure 4. Connecting the NLVD filter.

Route the 5/8” ID rubber hose behind
the strut and brake lines from new
filter position to the J909, along the
orange battery cable (Figure 5 and
6). Then secure with zip ties.
3.
Note:
5/8” ID rubber hose needs to be
routed in a way that there are no
sharp bends to prevent kinking.

Figure 5. Route the 5/8” ID rubber hose from new filter position to the
J909.

Page 4 of 10
© 2019 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.

Figure 6. Routing the rubber hose.

Page 5 of 10
© 2019 Audi of America, Inc.
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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.

Routing details to the J909, along the
4. orange battery cable. Add zip-ties
every 12 inches (Figure 7).

Figure 7. Where to zip tie the rubber hose to the battery cable.
5. Before connecting 5/8” ID rubber
hose to 90 degree connector, cut to
length, as needed. Connection
details to the J909 are shown in
Figure 8 and 9.

Figure 8. Connecting to the J909.

Page 6 of 10
© 2019 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.

Figure 9. Closer look at the connections.
6. Remove original NVLD filter
assembly. (Figure 10).

Figure 10. Remove original NVLD filter.

Page 7 of 10
© 2019 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:

2041

Damage Code:

0010

Labor Operations:

Wheel housing liner remove + reinstall

6676 1900

See SRT
(V1 and 2)

Ventilation tube with filter remove + reinstall

2048 1912

See SRT
(V1 and 2)

Activated charcoal filter remove + reinstall

2025 1900

See SRT
(V1 and 2)

NVLD pressure switch remove + reinstall

2041 1950

See SRT
(V1 and 2)

Diagnostic Time:

Claim Comment:

Install NVLD filter in optimize position including
routing of rubber hose

2041 9999

280 TU

GFF

0150 0000

Time stated on
the diagnostic
protocol (Max 10
TU) (V1 and 2)

Road test prior to service procedure

No allowance

0 TU

Road test after service procedure

No allowance

0 TU

(V2 only)

As per TSB #2050276/3

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.

Page 8 of 10
© 2019 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.

Required Parts and Tools
Part Number

Part Description

Quantity

4G0201997BD

Ventilation tube with filter (Version 1)

01

8K0906253L

NVLD pressure switch (Version 1 and 2)

01

4G0201801D

Activated charcoal filter (Version 1 and 2)

01 (If necessary)

4G0810171B

Wheel liner (Version 1)

01

8R0201232E

Filter (Version 1 and 2)

01 (If necessary)

1C0906621A

NVLD filter (Version 2)

01

N 90887703

M6 nut (Version 2)

01

5Q0906272

Rubber elbow (Version 2)

02

Part Number

Part Description

Quantity

Outside material

Aftermarket 5/8”ID rubber hose (Version 2)

12 feet

Outside material

Aftermarket 5/8”OD elbow (Version 2)

02

Outside material

Aftermarket hose clamps (Version 2)

06

Outside material

Zip-ties

30

Note:
No more than $30 will be covered by Warranty.

Tool Number

Tool Description

Quantity

Not Applicable

Digital scale (locally obtained)

01

Additional Information
All parts and service references provided in this TSB (2050258) are subject to change and/or removal. Always
check with your Parts Department and service manuals for the latest information. Please check the Repair
Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.

Page 9 of 10
© 2019 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.

©2019 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.

Page 10 of 10
© 2019 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.