U0121 Ford -

Question

I hAVE THIS CODE ON MY FORD FIVE HUNDRED AS WELL AS U 0100, IVE NEVER HAD THIS PROBLEM BEFORE AND I DONT KNOW IF ITS MINOR PLEASE HELP

Answer 1

U0121 Lost communication with the ant-lock brake system (ABS) control module

U0100 Lost communication with ECM

U0100 is and important code, check the battery condition, especially the battery terminals, "U" codes are communication code, weak battery condition especailly at start up can and do set communication codes,