Case IH L – Hitch Controller: Load control circuit failure

The system has detected an electrical fault, out-of-range signal, or complete failure in the circuit for the load control potentiometer (also known as the draft control potentiometer). When this code is active, the hitch system typically operates in a DEGRADED state.

• MX Maxxum
• 7200/8900 series Magnum
• Magnum 7100 Series
• Magnum 7200 Series
• 7110
• 7120
• 7130
• 7140
• 7210
• 7220
• 7230
• 7240
• 7250

1. 1

   Test the potentiometer resistance by disconnecting the connector at the load control potentiometer in the cab and connecting an ohmmeter between terminal A and terminal C (should read 10,000 ohms ± 10%, or 9,000 to 11,000 ohms)

2. 2

   Check the wiring harness for damaged wires or loose connectors

3. 3

   Test for continuity between the controller and the potentiometer (specifically between controller terminal 34 / red wire #502 and terminal C of the potentiometer connector, as well as the blue wire #502 and terminal B)

1. 1

   Replace the Potentiometer

   If the load control potentiometer fails the resistance test (does not read 10,000 ohms ± 10%), remove and replace it.

2. 2

   Repair Wiring

   If the potentiometer tests good but continuity is broken, repair the damaged wires or connectors in the harness.

3. 3

   Replace the Controller

   If both the potentiometer and the wiring harness test perfectly fine, the hitch controller itself has failed and must be replaced.

4. 4

   Recalibrate the Hitch

   The hitch system must be recalibrated every time a hitch component (including the potentiometer or controller) is replaced or adjusted.