Engine-Codes - Generic - U2106

U2106 - Lost Communications With Transmission Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

U2106 Possible Causes

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

How is the U2106 code repair?

Start by checking 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.

What is the cost to diagnose the U2106 code

Labor: 1.0

The cost to diagnose the U2106 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.
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Possible Symptoms

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

U2106 Meaning

Modules connected to the Controller Area Network (CAN) 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. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module. A module with a CAN serial data circuits malfunction or which loses power during the current ignition cycle will have a Loss of Communication Diagnostic Trouble Code (DTC) set by other modules that depend on information from that failed module. If any of the CAN circuit are shorted to battery voltage, ground, or between them no communication is possible on the CAN serial data bus, a Diagnostic Trouble Code will set.

More Information

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Information for specific makes

  • U2106 BUICK Lost Communications With Transmission Control Module
  • U2106 CADILLAC Lost Communications With Transmission Control Module
  • U2106 CHEVROLET Lost Communications With Transmission Control Module
  • U2106 GMC Lost Communications With Transmission Control Module
  • U2106 SATURN Lost Communications With Transmission Control Module

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