Symptom-based workshop manual

Service
205/20 ENU

3735

Transmission symptom - Oil leakage on automatic transmission: Observe specified procedure (SY
205/20)

3

Change overview:
Release

Date

Change

0

03/01/2021

•

First publication

1

06/27/2024

•
•

Vehicle types added
“Required parts” sections adapted to new vehicle types

2

01/06/2025

•

Update of PCSS encryption

Model Line:

Cayenne (9YA / 9YB)

Model Year:

As of 2018

Concerns:

Automatic transmission

Symptom:

Oil leakage is found on the vehicle in the area of the automatic transmission. The location and cause of the
problem cannot always be clearly determined.

Background:

We have discovered that the location and cause could not always be clearly determined in the dealer organization when attempting to resolve the complaint “Oil leakage”. As a result, some of the repair measures that
were carried out were not always effective.
An oil-contaminated oil pan, for example, may also be caused by oil migrating from the threaded connection
on the oil line.
Information
Oil leaks on the transfer box are described in the document ⇒ Technical Information 'Transmission symptom
- Oil leaks on transfer box: Observe specified procedure (SY 206/20)'.

Remedial
Action:

Find oil leakage and carry out the relevant repair measure.

Preparatory work
Work
Procedure:

Information
•

Oil leaks must be clearly identifiable and reproducible.

•

Engine oil and coolant must have reached operating temperature during a test drive.

1

Document the original complaint condition with meaningful photos.

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Symptom-based workshop manual

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2

Attach documentation to PCSS line.

3

Clean automatic transmission and transfer box thoroughly.
Information
If the oil leak has spread so that the oil pan is also
contaminated ⇒ Oil migration, proceed as follows in
the event of a complaint:
• Check that the screws on the ATF pan are accessible
and are seated correctly with the specified tightening
torque and secure properly if necessary.
• Clean the area of the ATF pan extremely thoroughly
as oil penetration of the ATF pan seal can result in
incorrect interpretation.

4

Spray large areas of the automatic transmission and
transfer box with SpotCheck around the suspected
leakage points.

5

Perform a test drive.

6

Locate the oil leakage:
•
•
•

Oil migration

The oil leakage is located on the transfer box; continue with ⇒ Technical Information 'Transmission
symptom - Oil leakage on transfer box: Observe specified procedure (SY 206/20)'.
The oil leakage is located on the automatic transmission; continue with ⇒ Technical Information
'Oil leakage on automatic transmission'.
The oil leakage cannot be clearly identified; continue with ⇒ Technical Information 'Oil leakage on
automatic transmission'.

7

Produce photo documentation of the leakage point located using SpotCheck.

8

Attach documentation to PCSS line.

Oil leakage on automatic transmission
Information
Traces of oil on the ATF pan can occur as a result of oil migration.
Only in rare cases is the ATF pan seal defective.
1

Check for oil leakage on the underside of the ATF pan ⇒ Crack in ATF pan.
If a crack is discovered, replace the ATF pan; see ⇒ Technical Information 'Replacing ATF pan'.

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Symptom-based workshop manual

Service
205/20 ENU

3735

3

Crack in ATF pan
Information
An oil-contaminated oil pan may also be caused by oil migrating from the threaded connection on the oil line.
2

Check for oil leakage on the flange of the ATF cooling line ⇒ Flange leaking or ⇒ Transmission housing
porous.
2.1

In the case of oil leakage on the flange, replace both sealing rings; see ⇒ Technical Information
'Replacing sealing ring on ATF cooling line'.

2.2

In the case of oil leakage between the flanges (transmission housing porous), replace the
automatic transmission; see ⇒ Technical Information 'Replacing automatic transmission'

Flange leaking

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Symptom-based workshop manual

Transmission housing porous
3

Check for oil leakage on the ATF cooling lines ⇒ Friction welded joint for ATF cooling line faulty or
⇒ Friction welded joint for ATF cooling line PHEV faulty.
In the case of oil leakage on the friction welded joint (production fault), replace the relevant ATF cooling
line; see ⇒ Technical Information 'Replacing ATF cooling line'.

Friction welded joint for ATF
cooling line faulty

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Symptom-based workshop manual

Service
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Friction welded joint for ATF cooling
line PHEV faulty
4

Check for oil leakage around the protective tube for drive shaft ⇒ Drive-shaft sealing ring damaged
(front protective tube) and ⇒ Drive-shaft sealing ring damaged (rear protective tube).
In the case of damage, replace both drive-shaft sealing rings; see ⇒ Technical Information 'Replacing
drive shaft sealing ring'.

Drive-shaft sealing ring damaged
(front protective tube)

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Drive-shaft sealing ring damaged
(rear protective tube)
5

Check for oil leakage around the output shaft to the transfer box ⇒ Oil migration and ⇒ Oil leakage on
output-shaft sealing ring.
5.1

In the case of damage, replace the output shaft sealing ring; see ⇒ Technical Information
'Replacing output shaft sealing ring'.

5.2

In the case of damage, replace the transfer-gear sealing ring; see ⇒ Technical Information
'Transmission symptom - Oil leakage on transfer box: Observe specified procedure (SY
206/20)'.

Oil migration

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Oil leakage on output-shaft sealing ring

Replacing sealing ring on ATF cooling line
Work Procedure: 1
2
Parts Info:

Replace sealing ring on ATF cooling line at the flange; see ⇒ Workshop Manual '386219 Removing and
installing ATF cooling line'.
Check and top up ATF; see ⇒ Workshop Manual '370235 Checking and topping up ATF'.

Required parts:
Part No.

Designation
– Point of use

Number

N 90666003

⇒ O-ring
– Line for ATF cooling

2 pieces

PAB39800803

⇒ Cover
– ATF pan

1 piece

or
PAB398008B

⇒ Cover
– ATF pan

1 piece

PAF00072900

⇒ M8 x 20 hexagon socket head bolt
– Front section of front underbody cover

3 pieces

or
N 10082912

⇒ Hexagon screw (instrument cluster), self-locking M6 x 16
– Engine protection

3 pieces

PAF82595100

⇒ Screw
– Center underbody cover

2 pieces

PAB32154900

⇒ Screw plug
– Checking and topping up ATF

1 piece

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Materials:

ENU

Symptom-based workshop manual

205/20

Required materials (usually already available in the Porsche Center):
Part No.

Designation
– Point of use
⇒ Transmission oil gear wheel set
– Checking and topping up ATF

0004321054

1) approx.

Quantity
20-liter/ 5.28
gal container
1)

0.1 liter/ 3.38 fl oz required per vehicle

Labor position:
APOS

Labor operation

I No.

37350100

Checking automatic transmission

38621900

Removing and installing lines for ATF cooling

37023550

Checking and topping up ATF

37023555

Checking and topping up ATF

PCSS
encryption:
Location (FES5)

38620

ATF cooling line

Damage type (SA4)

5043

Oil leak

References:

⇒ Workshop Manual '386219 Removing and installing line for ATF cooling'
⇒ Workshop Manual '370235 Checking and topping up ATF'
⇒ Technical Information '370235 Transmission symptom - Oil leakage on transfer box: Observe specified
procedure (SY 206/20)'

Replacing ATF cooling line
Work Procedure: 1
2
Parts Info:

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Replace ATF cooling line, see ⇒ Workshop Manual '386219 Removing and installing ATF cooling line'.
Check and top up ATF; see ⇒ Workshop Manual '370235 Checking and topping up ATF'.

Required parts:
Part No.

Designation
– Point of use

Number

PAB39800803

⇒ Cover
– ATF pan

1 piece

AfterSales

Symptom-based workshop manual

Service
205/20 ENU

3735

3

or
PAB398008B

⇒ Cover
– ATF pan

1 piece

PAF00072900

⇒ M8 x 20 hexagon socket head bolt
– Front section of front underbody cover

3 pieces

or
N 10082912

⇒ Hexagon screw (instrument cluster), self-locking M6 x 16
– Engine protection

3 pieces