New Holland NH 2035 – Transmission Control Module (TCU): Dump solenoid circuit fault

Indicates that the dump solenoid circuit is experiencing a short to 12V, a short to ground, or an open circuit. The dump solenoid is a critical hydraulic transmission component responsible for dumping hydraulic pressure from the clutches.

• T7.170
• T7.175
• T7.185
• T7.190
• T7.200
• T7.210
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T5 Series
• TM Series
• TN75A
• TN Standard
• Puma
• Maxxum

1. 1

   Inspect the wiring harness and connectors between the Transmission ECM and the transmission side harness (often connected at the firewall)

2. 2

   Inspect the connector directly at the dump solenoid (located on the side of the transmission by the Power Shuttle Control Valve) for disconnected, pinched, loose, or corroded pins

3. 3

   Use a multimeter to test the dump solenoid circuit for an open circuit, short to ground, or short to 12V to verify proper voltage supply and ground

4. 4

   Check if the dump solenoid cartridge valve is physically stuck in the valve block (if electrical circuit and solenoid coil test okay)

1. 1

   Park the tractor on a level surface, apply the parking brake, and turn off the engine.

2. 2

   Locate the dump solenoid on the transmission control valve block.

   Typically on the left side of the transmission.

3. 3

   Disconnect the electrical harness from the dump solenoid.

4. 4

   Repair or replace the affected harness section.

   Perform this if the wiring is faulty.

5. 5

   Remove the retaining nut and slide the solenoid coil off the cartridge valve to replace it.

   Perform this if the solenoid is faulty.

6. 6

   Extract the cartridge valve from the transmission block and install a new cartridge valve with fresh O-rings.

   Perform this if the cartridge valve itself is stuck or not operating correctly.

7. 7

   Install the new dump solenoid and reconnect the electrical harness.

8. 8

   Clear the EEPROM/fault codes from the transmission controller.

9. 9

   Perform a transmission clutch calibration procedure.

   Ensures the new solenoid operates smoothly and the clutches engage properly.