U0109 CADILLAC - Lost Communication With Fuel Pump Control Module
Tech notesThere 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 U0109
U0109 Cadillac DescriptionModules 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.
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