× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

U0109 Diagnostic Trouble Code Discussion for November 2021

Lost communication to FSCM

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC U0109
Help Request Posted
2011 Chevrolet Traverse LT 3.6L No Start VIN: 1GNKVGEDXB
U0109: Lost communication to FSCM. I have checked power and grounds are good. The new FSCM module won't allow communication to the differential module. The HS-LAN ckts are not open and not shorted to power or ground. Good voltage at the FSCM when ignition is turned on. I have disconnected t...
November 16, 2021