This code indicates a break, or open circuit, in the High-Speed Controller Area Network (CAN) bus, which prevents electronic modules from communicating with each other. When the network is open, data cannot travel across the circuit, leading to a loss of function in various vehicle systems.
Chafed, broken, or corroded wires and connectors are the most common cause of an open CAN bus circuit.
A loose, backed-out, or poorly seated terminal in a connector can create an open circuit on the bus.
Improperly installed aftermarket electronics, such as remote starts or alarms, can tap into or sever the CAN bus wires.
A module connected to the bus may have an internal open circuit, severing the network connection.
The powertrain control module may have an internal driver failure opening the circuit, though this is extremely rare.
No, it almost never does. This code means there is a physical break in the network wiring or a connector. Replacing the PCM for this code is a common and costly misdiagnosis.
It is not recommended. An open CAN bus can disable critical systems like the engine, transmission, ABS, or airbags, making the vehicle unpredictable and unsafe.
In an electrical circuit, 'open' means there is a break in the path, stopping current or data from flowing. On a CAN bus, it means the digital messages cannot reach their destination.
Technicians use a divide-and-conquer method, disconnecting the bus at mid-point splices or connectors and checking resistance to see which half of the network still has continuity.