U0101 - Lost Communication With Transmission Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

U0101 Possible Causes

  • Faulty Transmission Control Module (TCM)
  • TCM harness is open or shorted
  • TCM circuit poor electrical connection

First diagnose U0101 code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the U0101 code

    Labor: 1.0

    The cost of diagnosing the U0101 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

U0101 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.
OBDII Code U0101 - Lost Communication With Transmission Control Module  - AutoCodes.com

U0101 More Information

Need more information on how to fix the U0101 code?
Get Access to Factory Service Manuals

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 CHRYSLER Transmission Bus Message
  • U0101 DODGE Transmission Bus Message
  • 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 JEEP Transmission Bus Message
  • U0101 LEXUS 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
  • U0101 SCION Lost Communication With Transmission Control Module
  • U0101 TOYOTA Lost Communication With Transmission Control Module

Need more help?

Get the U0101 code diagnosed by a professional: Find a repair shop in your area

Related Information

U0101 Comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the U0101 code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧