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What Causes No Communication with the Transmission Control Unit?

2 Answers

DelJoy

07/24/25 1:51am

Transmission control unit no communication fault root cause is that other control units lose communication with the transmission control unit during vehicle operation, leading to the failure of the drive system and the inability of the vehicle to move. This fault code reflects the interruption of communication between the transmission mechatronic control unit and other controllers on the drive bus. Possible causes of the fault include: power supply, grounding, wiring faults of the transmission mechatronic control unit, or the transmission mechatronic control unit itself being faulty. Inspection method for the fault: For the no-signal fault of the transmission control unit, it is necessary to conduct a 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 the gateway data to see if there is communication, perform conventional line checks, and inspect the transmission control unit itself for faults.

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PenelopeMarie

08/10/25 9:30pm

I've encountered the issue of the transmission control unit losing communication several times. The main culprits are usually wiring connection problems—like loose or corroded plugs, or crushed wiring harnesses. It could also be insufficient power supply, such as blown fuses or unstable voltage from an aging battery, causing the control unit to become unresponsive. More complex scenarios include communication bus failures, like CAN line short circuits or breaks disrupting the entire network, or internal chip damage within the control unit. A heads-up: ignoring this can lead to serious trouble—your car might shift poorly, get stuck in gear, or even break down mid-drive. The fix typically involves scanning error codes with a diagnostic tool to pinpoint the fault, then replacing damaged components. But don't attempt DIY repairs; leave it to professionals for safety. Remember, regular electrical system checks can nip problems in the bud.

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