The Komatsu GDE650‑254 Electronic Shifter is a digital shift controller used on GD650 series motor graders to manage gear selection and hydraulic valve actuation. Common failures for this model include loss of communication with the main control unit (often due to corrupted firmware or damaged CAN bus connectors), power supply dropout to the shifter board, and overheating of the integrated microcontroller caused by excessive current draw from faulty solenoid valves. First‑check diagnostics: verify 24 V DC supply stability at the shifter terminals; inspect all CAN and power wiring for corrosion or loose connections; review any stored error codes on the main controller for communication or temperature alerts.[oss-gpt-20b]