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Why is there no communication with the transmission control unit?

1 Answers

VanCharlie

07/30/25 9:02am

The root cause of the no communication fault with the transmission control unit is that other control units lose communication with the transmission control unit during vehicle operation. The details are as follows: 1. Root cause of the fault The root cause of the fault is that other control units lose communication with the transmission control unit during vehicle operation, resulting in drive system failure and the vehicle being unable to move. This fault code reflects the interruption of communication between the transmission mechatronic control unit and other controllers on the drive bus. 2. Possible causes of the fault Possible causes of the fault include: power supply, grounding, wiring faults of the transmission mechatronic control unit, or faults in the transmission mechatronic control unit itself. 3. Inspection methods for the fault For the no signal fault of the transmission control unit, it is necessary to conduct step-by-step inspection, testing, and judgment from the outside to the inside, from mechanical to electrical, and from software to hardware. Check the power supply fuse, read gateway data to see if there is communication, perform routine wiring checks, and inspect the transmission control unit itself for faults.

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