What does fault code U1001 mean?

1 Answers
VanKimberly
07/29/25 2:03pm
U1001 fault code indicates a communication failure between various computer modules, or it could be a fault in the engine compartment relay control unit. When the U1001 fault code appears, it is necessary to promptly visit a 4S shop for inspection and repair. Communication failure between modules or computer boards is a very serious issue. More details are as follows: 1. Modern vehicles are equipped with numerous electronic devices, and cars are no longer purely mechanical. The abundance of electronic devices means that communication between these devices is essential. 2. Communication between electronic devices in a vehicle relies on CAN bus lines. If communication fails, it could be due to damaged CAN lines or loose CAN line connectors. Additionally, the negative terminals of electrical devices in vehicles are typically grounded. If there is an issue with the negative ground, it can lead to an open circuit.
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