Komatsu Fault Code
Free · no signupE012 / CA2384
Swing Function Soft / Heavy Machine Lug
System
Hydraulics
Symptom
Swing Function Soft / Heavy Machine Lug
Diagnosis & fix steps
LOGIC: Variable Swing Priority EPC Solenoid Valve Current Low (Open Circuit).
ACTION: Disconnect swing EPC solenoid at the main valve block. Measure internal coil resistance (spec: ~7–14Ω). Inspect harness routing along the pump compartment wall for harness pinch.
Red Seal field insights
Excavation Cycle: Swing EPC blends combined dual-pump flow between boom raise and swing rotation; an open circuit defaults the valve to neutral, slowing bench-loading cycles.
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