Case IH 19088 (F-519294-02) – Engine ECU / Aftertreatment System ECU: Error supply module heater plausibility

This code indicates a plausibility error or reduced heating capability with the internal heater of the DEF/AdBlue supply module. The system detects that the heater is not operating as expected, which may occur if the heater is trapped in an 'air bubble' with frozen urea.

• VESTRUM CVX
• Farmall (40-50, 95A, 100C, 110C, 115U)
• Maxxum (110-140)
• Puma (130-215)
• Magnum (180-370)
• Steiger (350-600)
• Combine 5130
• Combine 6130
• Combine 7130
• Combine 7230
• Combine 8230
• Combine 9230
• Patriot 4430
• Titan 3030
• Titan 3530
• Titan 4030
• Titan 4530
• Farmlift 632
• Farmlift 635
• Farmlift 735
• Farmlift 742
• Farmlift 935

1. 1

   Verify ambient conditions when the fault occurred (if below -10°C/14°F, the heater may be struggling against frozen urea trapped in an air bubble)

2. 2

   Inspect wiring harnesses and connectors leading to the DEF supply module for damage, looseness, or corrosion

3. 3

   Test the line heater relays and the main power relay for faults

4. 4

   Perform a continuity test across the heater circuit pins to check for an internal supply module continuity fault

1. 1

   Safety First

   Stop the engine and allow the exhaust and aftertreatment system to cool completely before servicing.

2. 2

   Clear Frozen Lines

   If operating in extreme cold, ensure the DEF tank and lines are properly thawed.

3. 3

   Repair Wiring/Relays

   If the diagnostic checks reveal a faulty relay or damaged harness, replace the relay or repair the wiring, then clear the code to see if it returns.

4. 4

   Replace the DEF Supply Module

   If the wiring and relays are intact but the internal heater continuity test fails, the heater element inside the pump has failed. The entire DEF supply module must be replaced.

5. 5

   Fluid Check

   When replacing the module, ensure the DEF fluid in the tank is clean and free from contamination to protect the new SCR components.

6. 6

   Clear Codes

   Reconnect the system, turn on the machine, and clear the ECU fault codes.