AutoCodes - Generic - U0101

U0101 Code - Lost Communication With Transmission Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U0101 code possible causes

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

|How do I fix the 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 connector's pins.

|U0101 code tech notes





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|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's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are U0101 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|U0101 code description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Transmission Control Module has not been received.
OBDII Code U0101 - Lost Communication With Transmission Control Module  - AutoCodes.com

|Need more information with the U0101 code?

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

|U0101 code 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 HYUNDAI Lost Communication With Transmission Control Module
  • U0101 INFINITI Lost Communication With Transmission Control Module
  • U0101 JEEP Transmission Bus Message
  • U0101 KIA Lost Communication With Transmission Control Module
  • 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 help with a U0101 code?

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|U0101 code comments

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