Caterpillar Fault Code
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Coupler Won't Release
System
Auxiliary
Symptom
Coupler Won't Release
Diagnosis & fix steps
LOGIC: Quick Coupler Solenoid Current Above Normal.
ACTION: Unplug the solenoid; if code changes to -5, replace the solenoid. If it stays -6, harness is shorted.
Red Seal field insights
Logic: Dead short in the 24V supply to the coupler valve.
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