For Shop Owners

U0100 CADILLAC - Lost Communication With Engine Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Faulty Engine Control Module (ECM)
  • ECM harness is open or shorted
  • ECM circuit poor electrical connection
What does this mean?

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

What does this mean?

Possible symptoms

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

U0100 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 U0100 Cadillac - Lost Communication With Engine Control Module -

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U0100 CADILLAC Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 11-02-2015

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