Symptom-based workshop manual

Service
88/25

ENU

3734

3

Complaints Regarding Shifting Quality on Double-Clutch Transmissions in Conjunction with Message
"Transmission Faulty" (SY 88/25)
Model Line:

911 (992)

Model Year:

As of 2020

Concerns:

Double clutch transmission

Symptom:

The customer complains about juddering when driving off or driving under light load, usually in conjunction
with the message "Transmission faulty" in the instrument cluster.
Information
There are no external leaks/leakages detected on the transmission.

Cause:

During vehicle operation, internal leakage in the double-clutch transmission can lead to oil transfer from
the hydraulic room (ATF/hydraulic oil) into the gearset room. As a result, the insufficient ATF/hydraulic oil
quantity leads to oil pressure deviations and thus to different functional and comfort faults.

Remedial
Action:

If the customer complaint can be traced and no external leak can be detected on the transmission, check
the fill level of the ATF oil and then the fill level of the final drive oil (PDK gearset oil) if necessary.
Information
All test steps must be documented with clearly recognisable images and/or videos (oil quantity display) as
well as the respective labelling and uploaded to the PCSS quality line.

Required parts and materials
Parts Info:

Part No.

Designation
– Location

Number

0DT301115

⇒ Screw plug, M22 x 1.5
– ATF filler screw (8-speed PDK)

1 piece

⇒ Screw plug, M18 x 1.5
– ATF filler screw (7-speed PDK)

1 piece

or
PAF008528

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Symptom-based workshop manual

88/25

PAF009390A

⇒ Screw plug with sealing ring M12 x 1.5 steel
- ATF adjustment pipe (8-speed PDK)

1 piece

Additional required parts if the final drive oil (PDK gearset oil) must be checked:
9A700852600

⇒ Screw plug, M10 x 1
– Filling screw for gearset compartment (8-speed PDK)

1 piece

or

Material:

9GT321399

⇒ Banjo bolt
– Filling screw for gearset compartment (7-speed PDK)

1 piece

N 0138161

⇒ A18x24 sealing ring
– Filling screw for gearset compartment (7-speed PDK)

2 piece

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

Designation

Quantity

00004321044

⇒ Double-clutch transmission oil, 1L

0.5 liter (16.9
fl-oz)

⇒ Transmission oil, clutch, 1L

0.5 liter (16.9
fl-oz)

or
00004330513

Required tools
Tools:

•
•

•
•
•
•
•
•

Nov 25, 2025
Page 2 of 4

P90999 - Porsche Tester 4
Battery charger with a current rating of at least 90 A and a current and voltage-controlled charge map
for lithium starter batteries, e.g. VAS 5908 - battery charger 90 A. For further information about the
battery chargers to be used, see the corresponding Workshop Manual. ⇒ Workshop Manual '270689
Charge battery and vehicle electrical system'
Torque wrench, 2-10 Nm (1.5-7.5 ftlb.), e.g.V.A.G 1783 - torque wrench, 2-10 Nm (1.5-7.5 ftlb.)
Torque wrench 6-50 Nm (4.5-37 ftlb.), e.g. V.A.G 1331A - torque wrench 6-50 Nm (4.5-37 ftlb.)
9768 - Electronic torque wrench, 2–100 Nm (1.5–74 ftlb.)
VAS 6563 - Manual metering pumps, Porsche set
VAS 6622A - Used Oil Collection and Extraction Unit
Measuring cup, commercially available

AfterSales

Service

Symptom-based workshop manual

88/25

ENU

3734

3

Check fill level of ATF oil and final drive oil (PDK wheel set oil)
Information
The work procedure described below must be documented with images and/or videos and attached to the
PCSS quality line.
Work Procedure: 1

Check fill level of ATF oil.

⇒ Workshop Manual '370235A2 Check and top up ATF.'
Assessment
( )

Oil level is OK or could only be topped up
in small quantities.

Action
Inspection OK.
The action described in this symptom-based
repair description (SY) is not expedient.
Continue troubleshooting in some other way.
End of action.

✗)
(✗

2

At least 0.5 liters .(16.9 fl-oz) of ATF oil
can be refilled.

Inspection not OK.
Check oil level for final drive (PDK gearset oil).
Continue with Step ⇒ 2.

Check oil level for final drive (PDK gearset oil).
⇒ Workshop Manual '399035 Checking and topping up oil for final drive (transmission oil)'
Information
Place a suitable measuring cup beforehand, collect any leaking final drive oil and measure and document
the quantity leaked.
Assessment
( )

The final drive oil level is OK (PDK
gearset oil).

Action
Inspection OK.
The action described in this symptom-based
repair description (SY) is not expedient.
Continue troubleshooting in some other way.
End of action.

✗)
(✗

Fill level in the final drive oil (PDK
gearset oil) is exceeded by at least
0.5 liters (16.9 fl-oz).

Inspection not OK.
The excessive fill level is due to oil mixing by oil
transfer from ATF oil into the final drive oil (PDK
gearset oil) of the double-clutch transmission.
Attach created image and/or video documentation
(oil quantity display) with the respective labelling
of the PCSS quality line.

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Symptom-based workshop manual
Replace double clutch transmission.
For work procedure, see: ⇒ Workshop Manual
'373427A2 Remove and mount double-clutch
transmission'

Labor position and PCSS encryption
Labor position:
APOS

Labor operation

37023590

Check and top up ATF.

39903590

Check and top up oil for final drive

I No.

PCSS encryption:
Location (FES5)

37340

Double-clutch transmission

Damage type (SA4)

5046

internal oil mixing

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are
written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in
order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and
may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins
are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester
are the ones that must be followed.

© 2025 Porsche Cars North America, Inc.

Nov 25, 2025
Page 4 of 4

AfterSales