The APDTY 141807 Rear Differential Locking Actuator Motor is a direct-replacement electronic actuator that engages and disengages the rear differential lock on 2006-2011 Mercedes-Benz ML-Class SUVs. When this motor fails, your vehicle loses the ability to electronically lock the rear differential for improved traction in off-road or low-traction conditions. APDTY 141807 restores factory differential lock functionality and replaces Mercedes OE part number 1645400288.
Key Takeaways
- Direct replacement for Mercedes OE 1645400288 rear differential lock actuator motor
- Fits select 2006-2011 Mercedes ML350, ML500, ML550, ML320, and ML63 AMG models—verify fitment with compatibility chart
- Restores electronic rear differential lock function for improved off-road and low-traction performance
- Symptoms of failure include differential lock warning light, inability to engage differential lock, or stuck differential lock
- Installation requires access to the rear differential housing and may require fluid service
Buy APDTY 141807 directly from APDTY
What Does the Rear Differential Locking Actuator Motor Do?
The rear differential locking actuator motor is an electromechanical device mounted to the rear differential housing. When you activate the differential lock switch inside the cabin, this motor physically engages a mechanism inside the differential that locks the left and right rear axle shafts together. In normal driving, the rear differential allows the wheels to rotate at different speeds during turns. When locked, both rear wheels spin at the same rate, which maximizes traction on slippery surfaces, sand, mud, or uneven terrain.
In Mercedes ML-Class SUVs equipped with electronic rear differential lock, the actuator motor receives a command from the vehicle's control module and uses a small electric motor and gear train to move the locking mechanism. When the motor fails, the differential cannot lock or unlock on command, limiting your vehicle's off-road capability and triggering dashboard warning lights.
What Are the Symptoms of a Failed Differential Lock Actuator?
A failing or failed rear differential lock actuator motor typically produces one or more of the following symptoms:
- Differential lock warning light illuminated: The dashboard displays a differential lock fault or warning symbol.
- Inability to engage differential lock: Pressing the differential lock button has no effect; the differential does not lock.
- Differential lock stuck engaged: The differential remains locked even after deactivating the switch, causing tire scrub and handling issues on pavement.
- Grinding or clicking noise from rear differential: The actuator motor or gears may produce abnormal sounds when attempting to engage or disengage.
- Error codes stored in vehicle computer: Scan tool retrieves fault codes related to rear differential lock actuator circuit or mechanical failure.
If you experience any of these symptoms, inspect the actuator motor, wiring, and differential lock mechanism. A failed actuator motor is a common cause and is often the most straightforward repair.
Which Mercedes ML-Class Models Does APDTY 141807 Fit?
APDTY 141807 is compatible with the following Mercedes-Benz ML-Class vehicles equipped with electronic rear differential lock:
| Year Range | Model |
|---|---|
| 2006-2007 | Mercedes ML500 |
| 2006-2011 | Mercedes ML350 |
| 2007-2009 | Mercedes ML320 |
| 2007-2011 | Mercedes ML63 AMG |
| 2008-2011 | Mercedes ML550 |
Important: Not all ML-Class vehicles came equipped with electronic rear differential lock as standard. Match your vehicle to the APDTY compatibility chart on the product page to confirm exact fitment before ordering. The actuator replaces Mercedes OE part number 1645400288.
APDTY 141807 Specifications and Part Number Cross-Reference
| APDTY Part Number: | 141807 |
| Replaces OE Number: | 1645400288 |
| Component Type: | Rear Differential Locking Actuator Motor |
| Condition: | Brand New |
| Fitment: | 2006-2011 Mercedes ML-Class (select models) |
| Mounting Location: | Rear differential housing |
This actuator is a direct-fit replacement designed to match OE form, fit, and function. It restores electronic differential lock operation without modification.
How Do You Install a Rear Differential Lock Actuator Motor?
Replacing the rear differential lock actuator motor requires moderate mechanical skill and access to the underside of the vehicle. The general procedure is as follows:
- Safely raise and support the vehicle: Use a lift or jack stands rated for the vehicle weight. Ensure the vehicle is secure and the parking brake is applied.
- Locate the actuator motor: The actuator is mounted to the rear differential housing, typically on the driver's side or top of the differential.
- Disconnect the electrical connector: Unplug the wiring harness from the actuator motor.
- Remove mounting fasteners: Unbolt the actuator from the differential housing. Note the orientation and position of any seals or gaskets.
- Install the new APDTY 141807 actuator: Position the new motor, ensure proper alignment of the actuator shaft with the differential lock mechanism, and torque fasteners to specification.
- Reconnect wiring and test: Plug in the electrical connector, lower the vehicle, and test differential lock engagement and disengagement using the dashboard switch.
- Check for leaks: Inspect the actuator mounting area for differential fluid leaks. Some installations may require a new seal or gasket (not always included).
Note: Some vehicles may require a scan tool to clear fault codes or relearn the actuator position after installation. Consult a factory service manual or professional technician if you are unfamiliar with rear differential service.
Frequently asked questions
Will APDTY 141807 fit my 2010 Mercedes ML350?
APDTY 141807 is listed as compatible with 2006-2011 Mercedes ML350 models equipped with electronic rear differential lock. Verify your vehicle against the APDTY compatibility chart on the product page to confirm exact fitment, as not all ML350s came with this feature.
What is the OE part number that APDTY 141807 replaces?
APDTY 141807 replaces Mercedes-Benz OE part number 1645400288.
Can I drive with a failed differential lock actuator motor?
Yes, you can drive normally if the differential is stuck in the unlocked position. However, if the differential is stuck locked, you may experience tire scrub, poor handling, and drivetrain stress on paved roads. Repair the actuator promptly to restore proper function and avoid further damage.
Do I need to drain the differential fluid to replace the actuator?
In most cases, partial fluid loss is possible when removing the actuator. Have fresh differential fluid on hand and be prepared to top off or replace fluid and the actuator mounting seal as needed. Consult your vehicle's service manual for specific fluid requirements and procedures.
The APDTY 141807 Rear Differential Locking Actuator Motor is a direct-replacement solution for restoring electronic differential lock function on 2006-2011 Mercedes-Benz ML-Class SUVs. If you're experiencing a differential lock warning light, inability to engage the lock, or a stuck differential, this actuator replaces OE part 1645400288 and returns your vehicle to factory performance. Verify your vehicle fitment using the compatibility chart on the APDTY product page, and regain the off-road capability and traction control your ML-Class was designed to deliver.