Transmission Control Module Safety Functions

If one or more components and/or sensors malfunction, the transmission control module activates the corresponding back-up functions. This guarantees the non-destructive operation of the transmission with the respective impact on the function and quality of changing gears.

When malfunctions are detected by the transmission, there are four possible situations: 

1. The malfunction is so minor that it is possible to continue driving with a replacement program while maintaining driving safety. The driver is not notified of this via the Selector Lever Transmission Range Display -Y5-. The display shows the selector lever position normally. If changes in driving behavior can even be detected.
2. The individual lever positions blink in the Selector Lever Transmission Range Display -Y5-. This signals to the driver that the gear selection is currently not possible. Example: Driving in reverse, lever in "R" and vehicle drives backwards. If "D" is engaged in this situation, the letter "D" blinks in the Selector Lever Transmission Range Display -Y5-. In this case, the control module prevents 1st gear from being engaged to avoid damaging the transmission. The gear is only engaged when the vehicle is stopped. If this is tested, do so carefully!
3. The Selector Lever Transmission Range Display -Y5- is completely lit up and blinking. The selector lever position is indicated/highlighted. Example: The transmission fluid temperature is too high. Reasons could include: Towing a trailer with too large of a load, accessories installed on the front of the vehicle, >>lack of cooling air<<.
4. The selector lever position engaged cannot be recognized. The Selector Lever Transmission Range Display -Y5- blinks. Changes in driving and shifting behavior. It is not possible to shift into reverse. There is a >>serious malfunction<<, a sub-transmission is switched off, transmission repair is necessary.