HCC 521001.02 – HCC Calibration Fault/Rear Hitch Pressure Valve Gain

HCC 521001.02 (HCC )

Code: 521001.02



This error code indicates an unsuccessful calibration of the Rear Hitch Raise Valve maximum current. This may be due to incorrect calibration procedures or a malfunction in the valve.


The HCC function is disabled (OFF) when this error code is active.


  • Perform Calibration:
    • Calibrate the Rear Hitch Raise Valve maximum current following the manufacturer’s instructions.
  • Verify Calibration Procedure:
    • Ensure that the calibration process is executed correctly and that all steps are followed precisely.
  • Inspect Valve and Wiring:
    • Check the Rear Hitch Raise Valve and its wiring for any signs of damage, loose connections, or corrosion.
  • Replace Faulty Components:
    • Replace the valve or any faulty wiring components if necessary.
  • Consult Technical Support:
    • If the issue persists after calibration, contact technical support for further diagnostics and troubleshooting.


Accurate calibration of the Rear Hitch Raise Valve is essential for proper hitch control. Regularly check and calibrate the valve to maintain optimal performance.

Control Units: John Deere

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