× 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

U0101 Diagnostic Trouble Code Discussion for November 2008

Lost Communication With TCM

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 U0101
Help Request Posted
2005 Hyundai Sonata GLS 2.7L MIL Lamp on VIN: KMHWF35HX5
U0101: Lost communication with TCM. ... relay with two orange wires having power that will connect to a red wire to the tcm isn't coming on. The other wires (2) a smaller black to ground is good but the smaller grey wire that comes from pcm to turn on relay doesn't get power. My question is perh...
November 06, 2008