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U0109 HUMMER

U0109 HUMMER - Lost Communication With Fuel Pump Control Module

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

  • Faulty Fuel Pump Control Module
  • Fuel Pump Control Module harness is open or shorted
  • Fuel Pump Control Module circuit poor electrical connection
  • Tech notes

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

    2008-2009 HUMMER H2

    HUMMER Factory Service Bulletin OBDII Code U0109

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • U0109 Hummer 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 U0109 Hummer - Lost Communication With Fuel Pump Control Module  - AutoCodes.com

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