John Deere 444.04 – HCC (Hitch Control Module): Supply Voltage Too Low / Unswitched Battery Voltage Low

Indicates that the supply voltage to the module (often monitored at a specific terminal, such as Pin J4) has dropped below the minimum operating threshold (typically below 9 volts). This is an electrical supply issue, not a mechanical failure of the hitch itself.

• 5090M
• 5100M
• 5100MH
• 5100ML
• 5115M
• 5115ML
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC
• 6145R

1. 1

   Perform a battery load test to ensure the battery can maintain proper voltage (above 9V) during high-draw events like engine cranking

2. 2

   Check fuses and ignition/power relays on the hitch control module circuit for failures

3. 3

   Inspect the unswitched battery supply wiring and connectors to the HCC (specifically terminal J4) for rubbed-through wires, pinched harnesses, or corrosion

4. 4

   Check chassis and module ground connections for poor contact; clean and tighten ground straps

5. 5

   Determine if the DTC periodically goes away (if it only appears during startup, the battery is likely the culprit)

1. 1

   Disconnect Power

   Turn off the machine and disconnect the negative battery terminal.

2. 2

   Resolve Supply Issues

   If the battery failed the load test, replace it. If the alternator is undercharging, repair or replace the alternator.

3. 3

   Repair Harness/Connectors

   If corrosion or wire damage was found at the HCC connector, use an electrical contact cleaner and replace any damaged pins. Splice and heat-shrink any damaged wires in the supply harness.

4. 4

   Replace the Module (If Necessary)

   If the battery is fully charged, the alternator is working, and a multimeter confirms steady, correct voltage and ground directly at the HCC connector, the module itself has an internal fault and must be replaced.

5. 5

   Recalibrate

   If the Hitch Control Module is replaced, the new module will likely require a software calibration (often triggering a secondary code like HCC 000630.13 - Control Software Not Calibrated) using John Deere Service ADVISOR.