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What Causes No Communication in Volkswagen Transmission Control Unit?

2 Answers

GabrielleFitz

07/29/25 7:20am

The cause of the malfunction 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 indicates a communication interruption between the transmission mechatronic control unit and other controllers on the drive bus. Possible causes include power supply and grounding issues of the transmission mechatronic control unit, wiring faults, or the failure of the transmission mechatronic control unit itself. Below are the relevant details: 1. Inspection: For a no-signal fault in the transmission control unit, a step-by-step inspection, testing, and diagnosis from the outside to the inside, from mechanical to electrical, and from software to hardware are required. This includes checking the power supply fuse, reading gateway data to verify communication, conducting routine wiring checks, and inspecting the transmission control unit itself for faults. 2. Automatic Transmission Hydraulic Control Unit: The automatic transmission hydraulic control unit refers to the oil circuit or valve plate, which is the component installed on the oil pan and controls the oil pressure throughout the transmission. It is the core component of a hydraulic-controlled transmission. Throttle oil pressure refers to one of the main control oil pressure signals on a hydraulic-controlled transmission.

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Rod

08/12/25 10:38am

I personally encountered a communication failure issue with the transmission computer in my Volkswagen. At first, I thought it was an operational error causing the vehicle to fail in recognizing gear position changes, but later I discovered the root problem was loose wiring connections. As a precision module, the transmission control unit requires stable power supply and good wiring support. Any interruption in power supply or data transmission lines can lead to communication failure. From my experience, this issue mostly arises from oxidized connector contacts causing poor connections or blown fuses leading to voltage fluctuations, especially after the vehicle has gone through water or rough roads. Therefore, the first step is to check all wiring harness connections to ensure there's no corrosion, and the second step is to open the fuse box to confirm whether the control unit's power supply is normal, which can help initially determine the fault direction. If all else fails, simply drive to a service station and connect a diagnostic tool to read the fault codes for a more accurate diagnosis.

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