Safety functions of transmission control module

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The automatic Transmission Control Module (TCM) -J217- receives information from components that effect selection of gears and passes the information on to solenoid valves that control the valves in the valve body.

If malfunctions occur while driving, the control module can activate supplementary functions or an emergency running program. These can affect the quality and function of the gear changes.

Depending on the seriousness of the malfunction, the engine control module can react by:

shifting dependent on engine speed

shifting with increased pressure (noticeable to the driver by jolts)

shifting after 4H

The transmission will remain in emergency running mode until the malfunction is no longer recognized by the control module over a predetermined period.