A201899 2050276_

20 MIL on (DTC P0451) and/or refueling issue
20 18 99 2050276/2 February 20, 2018. Supersedes Technical Service Bulletin Group 20 number 18-97 dated
February 2, 2018 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A6, A7
2016
All
3.0T
A6, A7
2017
000001 - 055271
3.0T
Condition
REVISION HISTORY
Revision
Date
Purpose
2
-
Revised Service (Updated Step 3)
1
02/02/2018
Initial publication
Customer has one or more of the following concerns:
 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 activated carbon filter reservoir and natural vacuum leak detection (NVLD)
pressure switch.
One or more of the following DTCs is found in the engine control module (ECM), J623 (address word 0001):
 DTC P0451 (pressure sensor for tank ventilation system, implausible signal)
 DTC P0441 (tank ventilation system, through-flow faulty)
Technical Background
Water enters through the tank ventilation system. The water can flow through the NVLD pressure switch into the
activated charcoal filter and freeze in cold temperatures.
Production Solution
Not applicable.
Page 1 of 3
© 2018 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.
Service
1. Remove activated charcoal filter, ventilation tube, and NVLD pressure switch.
Remove all components mounted on charcoal filter.
2. Weigh activated charcoal filter:
 If it weighs more than 2600 grams, replace
the activated charcoal filter + attached filter,
ventilation tube (Figure 1), and NVLD
pressure switch.
 If it weighs less than 2600 grams, replace
the ventilation tube (Figure 1) and the NVLD
pressure switch.
Figure 1. Ventilation tube of the activated charcoal filter.
3. A6 only: Install updated wheel liner.
Warranty
Claim Type:
 110 up to 48 Months/50,000 Miles.
 G10 for CPO Covered Vehicles – Verify Owner.
 If 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
40 TU
Ventilation tube with filter remove + reinstall
2048 1912
10 TU
Activated charcoal filter remove + reinstall
2025 1900
40 TU
NVLD pressure switch remove + reinstall
2041 1950
10 TU
GFF – Checking and clearing fault codes
included in existing labor operations
0150 0000
Time stated on
diagnostic
Diagnostic Time:
Page 2 of 3
© 2018 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.
protocol (Max 10
TU)
Claim Comment:
Road test prior to service procedure
No allowance
0 TU
Road test after service procedure
No allowance
0 TU
As per TSB #2050276/2
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.
Required Parts and Tools
Part Number
Part Description
Quantity
4G0201997BD
Ventilation tube with filter
01
8K0906253L
NVLD pressure switch
01
4G0201801D
Activated charcoal filter
01 (If necessary)
4G0810171B
Wheel liner
01
8R0201232E
Filter
01 (if necessary)
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.
©2018 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 3 of 3
© 2018 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.