34 Oil leak at the transmission connector
34 20 47 2058875/1 March 24, 2020.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A4

2017 - 2020

All

0CK, 0CL, 0CJ, 0HL and 0DK Transmissions

A6

2016 – 2020

All

0CK, 0CL, 0CJ, 0HL and 0DK Transmissions

A7

2019 - 2020

All

0CK, 0CL, 0CJ, 0HL and 0DK Transmissions

A5, Q5

2018 - 2020

All

0CK, 0CL, 0CJ, 0HL and 0DK Transmissions

Condition
Customer states:
 There is oil leaking from the vehicle.
Workshop findings:
 There is oil leaking from
the transmission control
module seal (Figure 1).

Figure 1. Evidence of oil leak from the transmission control module seal.

Technical Background
There are two distinct causes:
1. Residual oil from the manufacturing of the transmission (lubrication of seal when installing the control module
in transmission housing).
2. Overlap of seal on the transmission control module connector is not sufficient in all tolerances.

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© 2020 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.

Production Solution
Not applicable.

Service
1. If the oil leak is confirmed to be from
the area of the transmission control
module seal proceed as follows:
 Unplug the transmission control
module connector and lift the dust
cover below the connector to view
the sealing area cavity (Figure 2).

Figure 2. Dust cover lifted to view the sealing area.
2. Check whether this area has a thin film of oil or if there is an accumulation of oil:
 Assess the oil leak condition in the
indent under the dust cover. This
is easily viewable with a flashlight
and a mirror.
 If there is a thin film of oil in the
cavity (Figure 3) proceed to Step
2.
 If there is a puddle of oil in the
cavity (a millimeter or more)
proceed to Step 4 (Figure 4).
Figure 3. A thin film of oil in the cavity.

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© 2020 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 4. A puddle of oil in the cavity.
3. Repair/Diagnosis steps for a thin film of oil in the cavity:
 Very thoroughly clean the area and spray the affected area with oil leak detection spray (Part # G
001 900 A1 or a locally available talcum based oil leak detection spray equivalent).
 Perform an extensive test drive and assess the oil in the cavity again.
 If there is no more oil accumulation, it is not necessary to fit a new seal. No further repair is required
and the repair is complete. The film of oil was most likely from the assembly of the transmission.
 If there is oil moisture visible again continue to Step 4.
4. Repair steps for oil leaking from the transmission control unit seal:
 Save pictures of the oil leak with the Repair Order for warranty purposes.
 When the transmission was manufactured, a single seal was installed on the transmission control
unit but there is an option for a second lower seal (Figure 5). To repair the oil leak we will replace
the original seal and add a second seal in the lower position (Figure 6).

Page 3 of 6
© 2020 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 5. Option for 2nd seal.

Figure 6. Lower seal installed.

 Remove the mechatronics unit per
the repair manual.
 Remove the original seal from the
transmission control module.
 Install two new seals with the
sealing lip on the side of the
electrical connection (Figure 7).
 Reinstall the mechatronics unit per
the repair manual.
 Clear any faults that may have
been set during the repair.
 Test drive and confirm the leak is
repaired.
Figure 7. Seal installation.

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:

3481

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© 2020 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.

Damage Code:

0050

Labor Operations:

Check control unit (check connector for oil loss 3481 0199
as described in TSB)

20 TU

Clean control module (clean as described in
TPI and treat with talcum spray)

3481 2999

30 TU

Check transmission (after test drive check
connector again for leaks)

3435 0199

Remove and install the mechatronic unit with
associated operations based on optional
equipment (Only claim if Step 4 is required)

3511 1900

GFF

0150 0000

Time stated on
the diagnostic
protocol (Max 40
TU)

Road test prior to service procedure

0121 0002

10 TU

Road test after service procedure

0121 0004

10 TU

Diagnostic Time:

Claim Comment:

20 TU

See SRT

As per TSB #2058875/1

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.

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

0CK927523

Gasket

02

Additional Information
All parts and service references provided in this TSB (2058875) are subject to change and/or removal.

Page 5 of 6
© 2020 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.

©2020 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 6 of 6
© 2020 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.