https://docs.emtronaustralia.com.au/engine-management/config/communications/can-bus-errors/index.htmlCAN Diagnostics information can be found under the Communications Tab in the Runtime (F3) menu. Last Error Code Status Ack Error. This normally indicates the ECU cannot communicate with other devices on the BUS. Check all devices are running the same BUS Baud rate. BIT 0 Error. If this error is constant, it normally indicates a direct short between CAN Lo and CAN Hi. BIT 1 Error. If this error is constant, it normally indicates a direct short between CAN Lo and CAN Hi. BIT 0 & Ack Error. If the error is toggling between these two messages, this normally indicates the CAN Lo and CAN Hi are reversed. Command Bus Errors Emtron Transmitting data , but receiving device is missing from the CAN Bus.Hugoen-us