Vehicle Automotion G3‑HCNC‑J1939‑168‑R6‑GL2 13‑41361‑067 is a CNC controller that implements the J1939 protocol for automotive and heavy‑equipment applications. Common failure points in this class of units include power‑supply degradation (especially under high current draw), I/O module mis‑alignment or corrosion, firmware corruption, and overheating of the main processor or motor driver chips. Begin troubleshooting by verifying the input voltage and ripple against spec, inspecting all connectors for loose contacts or oxidation, and reviewing any stored diagnostic codes from the controller’s internal log or external OBD interface. If no faults are logged, perform a loop‑back test on the J1939 network to confirm communication integrity.[oss-gpt-20b]