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U0100 CHEVROLET

U0100 CHEVROLET - Lost Communication With Engine Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Engine Control Module (ECM)
  • ECM harness is open or shorted
  • ECM circuit poor electrical connection
  • Tech notes

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

    2007-2010 Chevrolet Avalanche
    2007-2010 Chevrolet Corvette
    2007-2010 Chevrolet Silverado
    2007-2010 Chevrolet Suburban
    2007-2010 Chevrolet Tahoe
    2008-2010 Chevrolet Silverado Hybrid
    2008-2010 Chevrolet Tahoe Hybrid

    Chevrolet Factory Service Bulletin OBDII Code U0100

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • U0100 Chevrolet 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 Chevrolet - Lost Communication With Engine Control Module - AutoCodes.com

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    Related Information

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