The vehicle's controller area network (CAN) or specialized hybrid/EV propulsion data bus relies on periodic status transmissions from the drive motor control function. Receiving modules (such as the hybrid/EV powertrain control module, vehicle integration controller, or central gateway) monitor message reception intervals; code U0110 sets when expected drive motor status frames remain absent or unavailable according to network supervision rules over designated evaluation cycles. U0110 is a communication code and does not by itself justify direct high-voltage testing. Diagnosis should begin with vehicle-specific network, low-voltage power/ground, module-availability, and companion-code information. Any work involving high-voltage propulsion components requires the manufacturer’s safety procedure, approved equipment, and appropriately qualified personnel.