U0024 indicates that the vehicle's low‑speed CAN communication bus is not communicating properly, meaning the network that links various control modules has an open circuit or loss of signal. The code signals a break in the bus that prevents data exchange between modules.
Open circuits, broken wires, or loose/ corroded connectors on the low‑speed CAN network interrupt data flow between modules.
Corroded ground straps or insufficient voltage to the bus can cause an open condition that triggers the code.
A defective Body Control Module, instrument cluster, or other node can stop transmitting messages, resulting in a bus open.
A PCM malfunction can disrupt bus output, but this is uncommon; the PCM is rarely the primary cause of U0024.
Improper termination can create signal reflections and open‑circuit-like conditions on the network.
No. In the majority of cases the fault is due to wiring, connectors, or a non‑PCM module; replacing the PCM is rarely necessary.
A blown fuse that removes power or ground to the CAN network can create an open condition and trigger U0024.
It means the electrical continuity of the bus line is broken, so signals cannot travel between modules.
Repair time varies with the root cause; fixing a loose connector may take minutes, while replacing a faulty module could require several hours.