C1203 hiace. Learn what ECM Communication Circuit Malfunction means, location and how to repair. Repair Information for C1203 Toyota code. Then save $23/month for 2 mos. This code indicates an ECM Communication Circuit #C1203 #ABS light fixIn this video I will show you how to decode C1203 :ECM/EVCommunication Circuit Toyota and Lexus The C1203 diagnostic trouble code (DTC) refers to an ECM communication circuit malfunction. The C1203 - ECM Communication Circuit Malfunction code on a Toyota indicates that the ABS (Anti-lock Braking System) module is not Skip the cable setup & start watching YouTube TV today for free. The ECM, or Engine Control Module, I'm here to assist you with your ABS light issue. Home Page Diagnostics ABS Faults Toyota Hiace GDH223 – C1203 – Ecm Communication circuit malfunction I developed a device that eliminates compatibility issues (fault C1203) and the parking brake notification on the dash after installing a Make: Toyota Code: C1203 Definition: ECM Communication Circuit Malfunction Cause: ECM You pull over, plug in your OBD-II scanner, and discover the C1203 code. . I see that you've been experiencing some trouble with the C1203 code, which indicates a problem with the ECM/EV communication circuit. s2p3rtlw6xjkxslt6kqm3igq1uvs4jkdnyaw1n8es9c