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- Porsche 955 Cayenne 3.2L V6 2003-06
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 957 Cayenne 3.6L 2007-10
- Porsche 957 Cayenne S/GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Transfer Case Electric Servo Motor
The transfer-case electric servo motor — also called a transfer case/shift motor, actuator, or servomotor — is a compact electric actuator that controls the Cayenne’s transfer case. It adjusts the internal gearing and clutch positions, enabling all-wheel-drive engagement and managing the low/high reduction functions inside the transfer box. This part is sold under Porsche part number PAB-341-601 (superseded by 955-624-601-00 and 955-624-601-01).
Why Replace It ?
- A servo motor should be replaced if it fails to operate or communicate properly, or if it shows signs of electrical damage or corrosion. Common symptoms include:
- AWD warning lights in the instrument cluster
- Vehicle operating as 2WD instead of AWD
- Slow, noisy, or delayed engagement
- Clunks or unusual noises when slowing down
- Stored transfer-case diagnostic trouble codes (DTCs)
- Because the motor contains sensors (potentiometers) and the connector seals can deteriorate, many failures are electrical rather than purely mechanical.
Fits:
- Porsche 955 Cayenne 3.2L V6 2003-06
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 957 Cayenne 3.6L 2007-10
- Porsche 957 Cayenne S/GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Common Symptoms & Failure Signs of AWD Systems
- Dashboard Warnings: Messages like “All-wheel drive system defective” may appear, often accompanied by reduced or no AWD functionality.
- AWD Engagement Issues: Vehicle stuck in 2WD or transfer case fails to shift into longitudinal reduction.
- Drivetrain Noises: Clunks, slow engagement, or unusual sounds at low speeds, sometimes intermittent.
- Diagnostic Trouble Codes (DTCs)
- Common codes related to AWD/transfer case issues include:
- 2040: Voltage supply to transfer box servo motor
- 2041: Ground supply
- 2042: Activation
- 2039 / 2033: Other transfer case errors
- These codes typically prompt technicians to inspect the servo motor, wiring, and connector pins.
- Connector Corrosion & Moisture Issues
- Porsche technical bulletins note that the servo motor plug can allow moisture ingress, leading to corroded pins. Recommended solutions include:
- Repair kit (replacing a section of cable/plug)
- Full replacement of motor + cable, depending on damage
- Tip: Don’t assume the motor is faulty before checking connectors and wiring.
- Transfer Case Mechanical Wear
- Sometimes, noisy or slipping transfer cases are due to mechanical issues rather than the servo motor. Common problems include:
- Stretched chain
- Worn internal components
- These failures are especially common on higher-mileage Porsche 955/957 models. Always consider mechanical wear as a potential cause when diagnosing AWD problems.
- When replacing you will need a new ECU module to fit or reprogrammed
Click 'Zoom in' for large parts diagram.
Diagram ref no 14
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PAB341601
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