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What does the Volkswagen 00381 fault code mean?

1 Answers

LaKylie

07/29/25 9:31am

It is a data bus system fault code. Faults caused by the vehicle power supply system: The operating voltage of automotive electronic control modules is generally between 10.5-15.0V. If the working voltage provided by the vehicle power supply system is abnormal, it may cause temporary malfunction in certain electronic control modules, leading to communication issues in the entire CAN bus system. Link faults in the vehicle CAN bus system: Short circuits, open circuits, or physical changes in the communication lines that cause signal attenuation or distortion can result in abnormal operation of multiple electronic control units, rendering the CAN bus system inoperable. Node faults in the vehicle CAN bus system: Nodes are the electronic control modules in the vehicle CAN bus system. Therefore, node faults refer to faults in the electronic control modules. These include software faults, such as defects or conflicts in the transmission protocol or software programs, which can cause chaos or failure in the CAN bus system communication. Such faults often occur in batches. Hardware faults are usually related to faults in the electronic control module chips or integrated circuits, causing the CAN bus system to malfunction. Solution: Conduct basic checks on the wiring and modules. If necessary, visit a professional repair shop for servicing.

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