What Error 424 Means
Error 424 signals a broader CAN bus communication failure — any component in the Bosch system network (motor, battery, display, accessories) failing to communicate within expected protocol parameters. Where error 414 specifically identifies a display-to-motor communication loss, error 424 is raised when the fault cannot be attributed to a single communication path or when multiple paths are affected simultaneously.
Diagnosis Approach
Step 1: Isolate the Failing Component
Systematically disconnect each component and test with it removed. Start with accessories (lights, GPS mounts, third-party sensors). If error 424 clears when a specific component is disconnected, that component is generating the CAN bus fault.
Step 2: Inspect All Connectors
Check every connector in the system — motor harness, display cable, battery contacts, and any junction boxes. A single corroded connector can corrupt the entire CAN bus.
Step 3: Check Battery Communication
Error 424 is sometimes caused by the battery CAN communication failing. Test with a known-good battery if available.
Step 4: Firmware Synchronisation
Ensure all components run current firmware. Component firmware mismatches cause CAN protocol version conflicts producing error 424 across the entire system.
Step 5: Dealer Diagnosis
Persistent error 424 requires the DiagnosticsTool 3 to monitor the CAN bus in real time and identify which node is generating the fault.