Case Fault Code
Free · no signupB042
Hydraulic Drifting.
System
Hydraulics (Arm)
Symptom
Hydraulic Drifting.
Diagnosis & fix steps
LOGIC: Arm Spool Pressure Sensor error.
ACTION: Check voltage at the sensor (5V Ref). Swap with the Boom sensor to see if the code moves.
Red Seal field insights
Pro-Tip: If the sensor is fine, the "spool stroke" sensor is seeing the arm move when the joystick is in neutral. This usually means a weak centering spring in the main valve.
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