× 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

U0121 Diagnostic Trouble Code Discussion for May 2010

Lost Communication With EBCM

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 U0121
Help Request Posted
2007 Chevrolet Cobalt LT 2.2L MIL Lamp on VIN: 1G1AL55F27
U0121: . ... while driving down the road the odometer and speedometer bounce back and forth, along with all the warning lights coming on. The steering also becomes very hard. The car does not die. Then I pull over the car, turn if off and everything resets, but sometim...
May 26, 2010