U0100 Lost Communication With ECM: Battery Voltage, CAN Bus, or Bad(04) Author Dalbo 19 Sep 2026 Save Image Image gallery: 2016 Mazda CX-5 Code U0100: Help!
![How To Fix U0100 Code Based on What Your Tests Show [2026] - Truck Guider](https://truckguider.com/wp-content/uploads/2026/05/Check-Battery-Voltage-Before-Anything-Else-300x164.jpg "How To Fix U0100 Code Based on What Your Tests Show [2026] - Truck Guider")
![How To Fix U0100 Code Based on What Your Tests Show [2026] - Truck Guider](https://truckguider.com/wp-content/uploads/2026/05/OBD-II-Port-Pin-Diagram-300x164.jpg "How To Fix U0100 Code Based on What Your Tests Show [2026] - Truck Guider")
![U0100 Code: Lost Communication with ECM/PCM 'A' [Fix]](https://axlewise.com/wp-content/uploads/2022/04/how-to-fix-pcm-300x150.jpeg "U0100 Code: Lost Communication with ECM/PCM 'A' [Fix]")