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U0101 - Lost Communication With Transmission Control Module

Possible causes
- Faulty Transmission Control Module (TCM)
- TCM harness is open or shorted
- TCM circuit poor electrical connection
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
U0101 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.

U0101 Information for specific makes
U0101 BUICK Lost Communication With Transmission Control Module
U0101 CADILLAC Lost Communication With Transmission Control Module
U0101 CHEVROLET Lost Communication With Transmission Control Module
U0101 FORD Lost Communication With Transmission Control Module
U0101 GMC Lost Communication With Transmission Control Module
U0101 HUMMER Lost Communication With Transmission Control Module
U0101 INFINITI Lost Communication With Transmission Control Module
U0101 LINCOLN Lost Communication With Transmission Control Module
U0101 MAZDA Lost Communication With Transmission Control Module
U0101 MERCURY Lost Communication With Transmission Control Module
U0101 NISSAN Lost Communication With Transmission Control Module
U0101 PONTIAC Lost Communication With Transmission Control Module
U0101 SATURN Lost Communication With Transmission Control Module
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