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Technical Information

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3995
Noise Symptom/Jerking - Clicking Noise/Rough-Running Engine/Jerking Under Load With
Respect to Transfer Case: Programming all-wheel drive control unit/checking transfer
case (SY 84/17)
ENU

Information
Currently, a high percentage of warranty returned transfer cases are evaluated as "OK" during
testing by the supplier.
For this reason, the two previous symptom-based repair instructions are being replaced by these
symptom-based repair instructions:
1.  "Eliminating noise symptoms - Re-programming control unit for all-wheel drive (Creaking noise from
around the transfer case/SY0416) –  only relevant for vehicles from model year 2015 to 2016
and
2.  "Eliminating symptoms - Engine: Replacing transfer case (Rough-running engine, vehicle jerks
under load/SY2516)
in Repair Group 39 - Final drive.

Information
The "transfer case" is designed as an active all-wheel drive system that is dynamically adapted to the
respective driving state.
Power transmission between the front and rear axle is controlled electronically via the "all-wheel
drive servo motor (transfer case)" and the multi-plate clutches integrated in the transfer case.
 On all-wheel drive vehicles, the drive train can become strained at low speeds and when the
steering is turned sharply when "Off-road mode" is activated, depending on design.

Revisions:

•

Under extreme conditions, the drive train can also become strained when "Off-road mode" is
deactivated.

•

Customers with little experience with all-wheel drive vehicles can interpret this behavior as a
fault, which in turn can result in incorrect diagnoses in the workshop.

Revision 1 —This bulletin replaces bulletin dated September 22, 2017.
The Information note under “Symptom 1”, the first bullet point was amended to read: “that were produced
from model year 2015 tomodel year 2016 and”
Revision 2 — This bulletin replaces bulletin dated November 2, 2017.
Under Symptom 2 —Step 2.4 was added.
Revision 3—This bulletin replaces bulletin dated February 6, 2018.
Under Symptom 2—Work Procedure—The Notice after Step 2, first sentence was changed to The
following software update via 'Programming Code' may not be used on vehicles before model year 2015.
Revision 4 — This bulletin replaces bulletins dated August 3, 2018.
Only modified transfer cases with GNC-coated plates are supplied from now on.
 In the event of spare parts requirements for the control unit (contained in the servo motor), the
existing type of transfer case (with or without GNC-coated plates) must be checked and the part
number of the control unit must be selected accordingly.

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 A transfer case with GNC-coated plates is identified by the PR number "LU2".
 For more information, see also "Spare parts requirements" and "Software".
Model Year:

As of 2011 up to 2017

Vehicle Type:

Cayenne (VR6 - 92A)/Cayenne S (92A)/Cayenne GTS (92A)/Cayenne Turbo (92A)/Cayenne
Turbo S (92A)

Equipment:

With transfer case

Spare parts
requirements:

Information
•

If the transfer case with servo motor (control unit) is replaced, there is no need to reload data (classification data).

•

This data is already contained in the control unit for servo motor and transmission bundle
replacement.

•

Classification data can be read out of the control unit using the PIWIS Tester (see "Actual values" tab)

•

If only the servo motor is replaced, the classification data must be re-written into the control unit.

•

Classification data can be found on the transfer case housing.

Only valid for model year 2011 - 2012:

 Technical Information '391300 All-wheel drive control
unit needs to be replaced: Missing offset and gradient
values on the transfer gear (66/11)'

Classification data for transfer case

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Technical Information
Software:

84/17

ENU

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Overview of required software versions in the control unit and the corresponding servo motor
part number:

E2 I vehicles
up to model year
2014:

Transmission without GNC (coating):

Transmission with GNC (coating):

Software version:
0947

Software version:
1150

Part No. of control unit (can be read
out using the PIWIS Tester):
0C2927755K

Part No. of control unit (can be read
out using the PIWIS Tester):
0C2927755T

Related Porsche Part No. of control
unit (servo motor in the PET):
958.618.755.09

Related Porsche Part No. of control
unit (servo motor in the PET):
958.927.755.
PR number:
(PIWIS Tester: Diagnostics  Vehicle
order •F7“ Additional menu 
Maintenance of vehicle data 
Transfer gear differentiation)
 The PR number must be
updated manually to the new
version with GNC plates if the
transfer gear is replaced.
LU2 – Transfer gear reinforced

E2 II vehicles
from model year
2015:

Software version:
1010

Software version:
1150

Part No. of control unit (can be read
out using the PIWIS Tester):
0C2927755K

Part No. of control unit (can be read
out using the PIWIS Tester):
0C2927755AA

Related Porsche Part No. of control
unit (servo motor in the PET):
958.618.755.12

Related Porsche Part No. of control
unit (servo motor in the PET):
958.927.755.A
PR number:
(PIWIS Tester: Diagnostics  Vehicle
order •F7“ Additional menu 
Maintenance of vehicle data 
Transfer gear differentiation)
 The PR number must be
updated manually to the new
version with GNC plates if the
transfer gear is replaced.

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LU2 – Transfer gear reinforced
With regard to
1:

1.  All-wheel drive servo motor (transfer case)  see "Symptom 1" below
Information
"Symptom 1" described below and the corresponding test procedure is relevant only for vehicles
 from model year 2015 to model year 2016.
 This procedure and remedial action must not be used for vehicles from model years 2011 to
2014.

Symptom 1:

Clicking noises can come from around the transfer case when driving slowly or when
manoeuvring in a parking garage.
Information
The customer complaint about a clicking noise (from the servo motor) can only occur on
vehicles:
•

that were produced from model year 2015 to model year 2016 and

•

with a software version lower than version 1010 in the all-wheel drive control unit.

Cause:

Clicking noises can come from around the transfer case when manoeuvring the vehicle (or driving slowly)
due to activation of the transfer case servo motor.

Remedial
action:

Before doing any other work, the symptom must be simulated using a test procedure.
(Opening the door windows can be helpful when evaluating noises).
1

Conditions for the first test procedure:
•
•
•

Activate the Start/Stop function and
deactivate all sources of noise in the vehicle (Entertainment, ventilation, etc.).
A multi-storey parking garage can be useful for acoustic reverberation.

•
•
•
•

On a straight stretch
from speeds less than 10 mph (20 km/h)
brake the vehicle to a standstill.
The best way of finding the clicking noise is by driving slowly and then stopping the vehicle.

 In the event of a distinct customer complaint, the clicking noise can already be heard on a straight
stretch with partial load accelerations.
 To correct the problem, re-program the all-wheel drive control unit. See "Work
Procedure" section below.
The measure is complete after programming the all-wheel drive control unit.

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With regard to
2:

84/17

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Hang-on transfer case  see "Symptom 2" below
Information
"Symptom 2" described below and the corresponding test procedure is relevant for vehicles
 from model year 2011 to model year 2017.
 For vehicles from model year 2015, the test procedure described under "Symptom 1" must
be completed before doing any other work.

Symptom 2:

Symptoms to be checked:
•
•
•

Rough-running engine or
the vehicle vibrates or
the engine jerks under load.

Information
Generally, the vehicle can start jerking when driving in tight corners with a small radius and when Off-road
mode is activated.
This behavior is perfectly normal for all-wheel drive vehicles and is not a defect on the vehicle.
NOTICE
Driving with connectors on chassis components or control units disconnected.
•

Bearings in transfer case can be damaged.



Drive vehicle only at a maximum speed of 30 mph (50 km/h).



Do not drive vehicle in the upper load range or at full throttle.



During Diagnosis of a vibration, a defective front axle shaft can cause a vibration and is masked when the
Transfer case is disconnected as torque is no longer applied to the front drive system in the same manner.
1

Carry out the test procedure under the following conditions:
•
•
•

On a straight stretch
from speeds less than 10 mph (20 km/h)
accelerate the vehicle in the partial load range.

During this test procedure, if:
•
•

jerking can be felt, the test procedure under  (below) must also be carried out in order to
determine the exact cause.
no jerking is felt, see the information below about normal vehicle behavior:

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