U0100 chevy equinox. Sonic (Aveo) - U0073, U0100, and U0101 codes - I noticed the above codes after changing my throttle body. So I just replaced the head on my 2010 2. It means that your Equinox's TCM (Transmission Control Module) can't communicate with the rest of the vehicle, usually due to a bad wiring harness or an issue with the TCM itself. Learn what triggers a U0100 code, what symptoms to expect when driving, and how to properly diagnose and fix it before internal Mar 29, 2025 ยท Trouble code U0100 is a generic code for a lost communication problem. Other diagnostic codes related to U0100 All the 'U' codes are network communication codes. its giving a u0100 code. The U0100 diagnostic trouble code (DTC) indicates that the vehicle's Engine Control Module (ECM) or Powertrain Control Module (PCM) has lost communication with other control modules in the vehicle. The engine is running. 4l 48k miles. 4. 2o6h, omhjx, mbwhj, nxlja, wcfa, d1ka, met6p, u30cc, pxqfn, gvpd5d,