Case IH 19107 – Engine Control Module (ECM) or Dosing Control Unit (DCU): DEF/AdBlue supply module pump motor open load failure

This code indicates an "open load" (open circuit) in the electrical circuit of the Diesel Exhaust Fluid (DEF) pump motor. The system has detected that the electrical connection to the pump motor is broken, disconnected, or the motor's internal winding has failed, preventing the pump from supplying DEF to the Selective Catalytic Reduction (SCR) system.

• Tier 4b
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• 5130
• 6130
• 7130
• Farmall (115U, 130A)
• Magnum (180 through 370)
• Steiger (350 through 600)
• Puma (130 through 215)
• Maxxum series
• Patriot Sprayers (4430)
• Farmlift Telehandlers

1. 1

   Inspect the electrical connector at the DEF supply module. Look for disconnected plugs, pushed-out pins, corrosion, or dried white urea crust that may have compromised the connection.

2. 2

   Inspect the wiring harness between the DEF supply module and the ECM for broken wires, chafing, or rodent damage that would cause an open circuit.

3. 3

   Measure the resistance of the DEF pump motor itself using a multimeter. If the multimeter reads infinite resistance (OL), the internal motor winding has failed open.

4. 4

   Use a diagnostic scan tool to observe DTC information and verify if the code is active or stored.

1. 1

   Turn off the machine's ignition switch and disconnect the battery.

   Turn off the machine's ignition switch and disconnect the battery.

2. 2

   If the diagnostic checks reveal a broken wire or damaged connector in the harness, repair the wiring and retest the system.

   If the diagnostic checks reveal a broken wire or damaged connector in the harness, repair the wiring and retest the system.

3. 3

   If the wiring is intact but the pump motor has failed internally, the DEF supply module must be replaced.

   If the wiring is intact but the pump motor has failed internally, the DEF supply module must be replaced.

4. 4

   Clean the area around the DEF pump thoroughly to ensure no dried urea crust or dirt enters the high-pressure fluid loops.

   Clean the area around the DEF pump thoroughly to ensure no dried urea crust or dirt enters the high-pressure fluid loops.

5. 5

   Disconnect the electrical harness and the DEF suction/return lines from the module.

   Disconnect the electrical harness and the DEF suction/return lines from the module.

6. 6

   Unbolt and remove the faulty DEF supply module from its mounting bracket.

   Unbolt and remove the faulty DEF supply module from its mounting bracket.

7. 7

   Install the new DEF supply module, reconnect the fluid lines, and plug in the electrical connector.

   Install the new DEF supply module, reconnect the fluid lines, and plug in the electrical connector.

8. 8

   Reconnect the battery and turn on the ignition switch without starting the engine.

   Reconnect the battery and turn on the ignition switch without starting the engine.

9. 9

   Use a diagnostic scan tool to clear the P20C9/19107 fault code.

   Use a diagnostic scan tool to clear the P20C9/19107 fault code. Note: Depending on the exact model, the new DEF supply module may need to be programmed to the vehicle's ECM after replacement.

10. 10

    Run an SCR system test to prime the pump and verify the repair.

    Run an SCR system test to prime the pump and verify the repair.