U0101 Volvo Lost Communication With Transmission Control Module

U0101 Volvo Lost Communication With Transmission Control Module

Possible causes
– Faulty Transmission Control Module (TCM)
– TCM harness is open or shorted
– TCM circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
U0101 Volvo Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module.

Volvo Vehicle:Volvo C70,Volvo S40,Volvo XC90,Volvo XC70,Volvo XC60,Volvo V70,Volvo V50,Volvo V40,Volvo S90,Volvo S80,Volvo S60
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