Lost Communication With Fuel Pump Control Module
Table of contents
U0109 HUMMER Possible Causes
- Faulty Fuel Pump Control Module
- Fuel Pump Control Module harness is open or shorted
- Fuel Pump Control Module circuit poor electrical connection
How do I fix code U0109 HUMMER?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- There is a factory service bulletin for the 2008-2009 HUMMER H2:
- 2008-2009 HUMMER H2 Factory Service Bulletin OBDII Code U0109
Cost of diagnosing the U0109 HUMMER code
The cost of diagnosing the U0109 HUMMER code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
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.
