DTC U0001-00: High Speed CAN Communication Bus Off: General Description

WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.

The main features of CAN (Controller Area Network) bus system are:

A data-transfer rate up to 1 Mbit/s for the high-Speed CAN and up to 125kbit/s for the low-speed CAN.
Signals are broadcast in both directions.
The multi-master principle.
High availability by locating failed control units.
Standardization in accordance with ISO 11898.

Vehicle electronic control need many informations of each module to reduce exhaust and increase convenience/safety by optimum control. The TCM can either receive data from the ECM or ABS control module, or it can send data to the PCM and ABS, PCM by using CAN communication. The CAN communication is one of the vehicle communications method, which is now widely used to transfer the vehicle.