Komatsu Fault Code
Free · no signupA001 / Event 16
No Propulsion / DC Bus Warning Lamp
System
Electric Propulsion
Symptom
No Propulsion / DC Bus Warning Lamp
Diagnosis & fix steps
LOGIC: Main Inverter DC Bus Undervoltage / Link Discharge Incomplete.
ACTION: Inspect main alternator phase excitation diodes and rectifier bridge. Measure DC bus link discharge resistor circuit continuity and verify capacitor bank balance with a high-voltage insulation tester.
Red Seal field insights
High-Voltage Physics: The Inverter Control System (Invertex/Statex) locks out gate firing pulses to the IGBT modules if DC bus link voltage fails to stabilize above 1,400V DC during throttle ramp-up.
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