OBDII Code List

U0101 CADILLAC - Lost Communication With Transmission Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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U0101 CADILLAC Possible Causes

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

First diagnose U0101 CADILLAC 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.

U0101 CADILLAC Tech Notes

There is a factory service bulletin for the following Cadillac models:

2007-2010 Cadillac Escalade Models
2007-2010 Cadillac XLR
2009-2010 Cadillac Escalade Hybrid

Cadillac Factory Service Bulletin OBDII Code U0101

Cost of diagnosing the U0101 CADILLAC code

    Labor: 1.0

    The cost of diagnosing the U0101 CADILLAC 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 CADILLAC Possible Symptoms

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

U0101 Cadillac 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 Cadillac - Lost Communication With Transmission Control Module  -

U0101 CADILLAC More Information

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