Automatic Transmission

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Transmission

The 8-speed automatic transmission 0BK AWD is equipped with 8 hydraulically activated forward gears. When the torque converter lock-up clutch is closed, these forward gears become manually driven gears through bypassing the torque converter slip.
A special feature of the 0BK transmission is the position of the front final drive (front axle differential with flange shafts) in front of the torque converter. An even distribution of the weight between the front and rear axles is attained.

Torque Converter

The torque converter is equipped with a slip-controlled torque converter lock-up clutch. Due to the new design of this transmission, the torque converter is located behind the front final drive.

Mechatronic

The Mechatronic combines the following components as a complete synchronized unit:

The hydraulic control, the transmission control module -J217-
The sensors and actuators

The Mechatronic unit is installed in the transmission in the area of the ATF pan.

Transmission Control Module -J217-

The control module is a part of the Mechatronic unit in the transmission.

Determining the driving situation and driving resistance dependent shift point occurs automatically.

Advantages:

Usage-based shifting
Maximum engine output is always available
Individual adaptation of shift points in all driving situations
Gear shift points are infinitely variable

OBD

Use guided fault finding to determine the exact cause of damage before servicing the automatic transmission.

Use the vehicle diagnosis tester to perform Guided Fault Finding

Shift Point Changes on Inclines and Declines

When driving on inclines or declines, gears are automatically selected using additional shift characteristic maps. The selection is based on accelerator pedal position and vehicle speed.

The gear change map for extreme uphill stretches is matched to engine output
The gear change map for extreme downhill stretches is matched to the braking effect of the engine.
By selecting a gear directly using tiptronic, the driver can use the engine braking effect with a specific gear engaged, for example when driving downhill with a trailer.