Question

2007 GMC Sierra 4.8L set the U0109 code. Read the service information in repair manuals but still at a loss as to what to do about this code resetting. Any information would be appreciated.

Answer 1

Is there any other code that has been set with U0109? This is the best way to verify that the fuel pump module would set a U0109 code

U0109 GMC Code - Lost Communication with Fuel Pump Control Module
Read more: https://www.autocodes.com/u0109_gmc.html