Case IH 19661 – Engine Control Unit (ECU) or Vehicle Control Module (VCM): No valid Fuel filter pressure received via CAN (Pressure == 0)

This code indicates a communication or electrical failure where the engine management system is not receiving a valid pressure reading from the fuel filter pressure sensor over the Controller Area Network (CAN) bus. A reading of exactly "0" typically points to a dead sensor, an open circuit, a short, or a CAN timeout, rather than a mechanical fuel restriction.

• Tier 4b
• Farmall 65C
• Farmall 75C
• Farmall 90C
• Farmall 100C
• Farmall 115U
• Magnum
• Steiger
• 580N
• 590SN
• Skid Steers
• 1150K
• 1850K
• 721D

1. 1

   Inspect the fuel filter pressure sensor wiring harness, connector, and contact pins for oxidation, corrosion, or physical damage.

2. 2

   Verify that the sensor is receiving the correct reference voltage/power supply from the ECU.

3. 3

   Check the continuity of the signal wires back to the ECU. If the sensor communicates via a sub-module, verify the CAN bus network integrity (checking for proper resistance and no shorts to ground/power).

4. 4

   If the wiring is intact, temporarily connect a known-good fuel filter pressure sensor to see if the ECU registers a valid pressure reading, which confirms the original sensor has failed internally.

1. 1

   Preparation

   Turn off the engine, remove the key, and allow the machine to cool. Relieve any residual pressure in the fuel system.

2. 2

   Locate the Sensor

   Find the fuel filter pressure sensor, which is threaded directly into the main fuel filter housing/water separator assembly.

3. 3

   Disconnect

   Carefully unplug the electrical connector from the sensor, ensuring you do not break the locking tab.

4. 4

   Removal

   Unscrew the faulty pressure sensor from the filter housing. Have a rag ready to catch any minor fuel spillage.

5. 5

   Installation

   Thread the new OEM replacement sensor into the housing and tighten it to the manufacturer's torque specifications.

6. 6

   Reconnect

   Plug the electrical harness back into the new sensor, ensuring the weather seal is seated properly.

7. 7

   Prime the System

   Prime the fuel system (using the hand primer pump if equipped) to purge any air introduced during the swap.

8. 8

   Clear Codes

   Start the engine, check the filter housing for leaks, and use a diagnostic scan tool to clear the 19661 fault code from the ECU.