For Shop Owners

U0100 - 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?

Possible symptoms

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

U0100 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 - Lost Communication With Engine Control Module -

U0100 Information for specific makes

U0100 BMW Lost Communication With Engine Control Module
U0100 BUICK Lost Communication With Engine Control Module
U0100 CADILLAC Lost Communication With Engine Control Module
U0100 CHEVROLET Lost Communication With Engine Control Module
U0100 GMC Lost Communication With Engine Control Module
U0100 HUMMER Lost Communication With Engine Control Module
U0100 MAZDA Lost Communication With Engine Control Module
U0100 PONTIAC Lost Communication With Engine Control Module
U0100 SATURN Lost Communication With Engine Control Module

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U0100 Comments

Help us improve 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 U0100 code? Have you replaced any parts?
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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