Volkswagen / Audi DSG Mechatronic Unit Replacement
A direct-shift gearbox (German: Direkt-Schalt-Getriebe), commonly abbreviated to DSG, is an electronically controlled dual-clutch multiple-shaft manual gearbox, in a transaxle design – without a conventional clutch pedal, and with full automatic, or semi-manual control. The controller for the clutching functionality is housed in the Mechatronic Unit.
The clutches and gearbox units in the DSG are operated hydraulically. This function is performed by the gearbox mechatronics module, housed in the DSG. The term “mechatronics” is derived from combining the words “mechanics” and “electronics”. And this is exactly how the mechatronics module is structured with the electronic transmission control unit, various sensors and the hydraulic control unit all forming one compact entity.
The control unit uses information such as engine speed, driving speed, accelerator position and driving mode to select the optimum gear and to determine the ideal shift point. The hydraulic control unit then implements the shift commands in a complex sequence of individual, precisely coordinated actions.
The mechatronics module can perform complex shift operations in a fraction of a second. It consists of a control unit and a control valve assembly together with individual sensors and actuators. The gearbox’s control unit is in constant communication with the engine control unit. This “dialogue” determines the ideal point at which to make a gear change, which means the engine is always only consuming as much fuel as it needs to at that point.
Sometimes the fail points of the mechatronics module will include the infamous flashing PRNDS or the inability to engage the forward or reverse gears to move off. This is when the mechatronics module needs to be changed out.
Don’t fear cause we’ll have the MU changed out in a jiffy without the loss of your vehicle for too long. Most MU jobs can be changed within 2 hours.