A3421522062540_1

34 Transmission oil leak at the auxiliary hydraulic pump
34 21 52 2062540/1 March 10, 2021.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A3
2017 - 2020
All
0GC transmission
TT
2019 - 2021
All
0GC transmission
Condition
Customer states:
 There is an oil leak under the front of the vehicle.
Workshop findings:
 Oil leak confirmed from the area of the
transmission auxiliary hydraulic pump
(V475) and the transmission housing
(Figures 1 - 2).
Figure 1. Oil leaking in area of the auxiliary hydraulic pump
(V475).
Page 1 of 5
© 2021 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 2. Oil leaking in area of the auxiliary hydraulic pump
(V475) detail.
Technical Background
There is an issue with O-ring of auxiliary hydraulic pump (V475).
Production Solution
Not applicable.
Service
Clean gearbox housing/perform short test drive to warm up gearbox/locate leak and (if necessary)
replace O-ring for electric motor for auxiliary hydraulic pump 1 (V475).
1. Clean and remove all oil residue from the transmission and allow the surface to dry. Confirm the exact
location of the leak by applying oil leak tracing powder to the suspected areas of the leak. Do not use oil
dyes in any Audi transmissions.
Page 2 of 5
© 2021 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. Spray oil leak detection spray (part number: G 001 900
A1 or equivalent) on the affected area and assess the
leak again (Figure 3).
Figure 3. Example of gear oil leaking in area of
auxiliary hydraulic pump (V475).
3. Perform a short test drive to warm up the gearbox (oil temperature at least 80° C).
Option A. If it is clear, the leak is between the electric
motor for auxiliary hydraulic pump (V475) and the
transmission housing. Document your findings and
please take photos of the leak and retain them with the
repair order. Photos should:
 Have a date stamp and VIN reference.
 Be taken in focus and with sufficient light.
The O-ring (item 33, highlighted in yellow in Figure 4)
for the electric motor for auxiliary hydraulic pump 1
(V475) must then be replaced according to the repair
manual.
Figure 4. O-ring for electric motor for auxiliary
hydraulic pump (V475).
Tip: Lubricate the O-ring and the area of the
transmission that the seal contacts with ATF to prevent
damage to the O-ring during installation.
Option B: If the O-ring for the electric motor for auxiliary hydraulic pump (V475) is not determined as the
cause of the leak, this TSB does not apply. Please continue diagnosis outside of this TSB.
Page 3 of 5
© 2021 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 vehicle is outside any warranty, this Technical Service Bulletin is informational only.
Service Number:
3857
Damage Code:
0015
Labor Operations: Noise dampening pan remove + reinstall
1082 1900
See SRT with
associated
operations
Clean gearbox and treat with leak detection
spray
3435 2999
20 TU
Check hydraulic pump
3479 0199
10 TU
3479 1900
See SRT with
associated
operations
Hydraulic pump remove + reinstall
3479 1950
See SRT with
associated
operations
Bevel gear drive remove + reinstall
3970 1912
See SRT with
associated
operations
GFF
No allowance
0 TU
Road test prior to service procedure
0121 0002
10 TU
Road test after service procedure
0121 0004
10 TU
Vehicles with front-wheel drive:
Hydraulic pump remove + reinstall
Vehicles with four-wheel drive:
Diagnostic Time:
Claim Comment:
As per TSB #2062540/1
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.
Page 4 of 5
© 2021 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
Always check with your Parts Department and/or ETKA for the latest information and parts bulletins.
Part Number
Part Description
Quantity
See ETKA
Fasteners, Bolts, Nuts and Screws as needed per the
Repair Manual
See ETKA/ELSA
G 001900A1
Oil leak locating spray
Shop Supply
O-ring
01
(or equivalent)
0GC927115
Additional Information
All parts and service references provided in this TSB (2062540) are subject to change and/or removal.
©2021 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 5 of 5
© 2021 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.