Massey Ferguson 4.00.9B – TRANS2: Issue With Powershift N Solenoid Supply Voltage

The transmission control unit has detected an electrical fault—such as an open circuit, short circuit, or out-of-range voltage—on the power supply circuit dedicated to the "N" (Neutral/Range) Powershift solenoid. When this solenoid fails or loses power, the tractor may experience harsh shifting, get stuck in neutral, or refuse to engage forward/reverse gears.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5709
• 5710
• 5711
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7722
• 7724
• 7726

1. 1

   Verify the transmission/hydraulic fluid is at the correct level, as low fluid can mimic engagement issues.

2. 2

   Trace the wiring from the TRANS2 module to the Powershift N solenoid. Look for chafed wires, melted insulation, or pinched harnesses that could cause a short to ground or an open circuit.

3. 3

   Disconnect the solenoid plug and check for corrosion, water ingress, or bent pins.

4. 4

   Test the supply voltage at the solenoid connector while the tractor is keyed on and the transmission is commanded to shift. You should see a standard 12V supply. If voltage is erratic (e.g., 4-6 volts), you likely have a wiring or relay issue, not a bad solenoid.

5. 5

   Ensure the solenoid has a clean, low-resistance path to ground.

6. 6

   Measure the resistance (Ohms) across the solenoid coil pins. An infinite reading means the internal coil is broken (open), and the solenoid must be replaced.

1. 1

   Relieve Pressure

   Turn off the tractor and relieve all hydraulic pressure from the transmission system before opening the hydraulic block.

2. 2

   Clean the Area

   Thoroughly clean the exterior of the transmission valve block around the Powershift N solenoid. Any dirt entering the hydraulic circuit can cause premature wet-clutch or valve failure.

3. 3

   Disconnect

   Unplug the electrical connector from the faulty solenoid.

4. 4

   Remove

   Remove the retaining nut or bolts holding the solenoid coil and valve cartridge in place. Carefully extract the solenoid from the valve block.

5. 5

   Install

   Lubricate the O-rings on the new solenoid with clean transmission fluid. Insert the new solenoid into the block and tighten the retaining hardware to OEM torque specs.

6. 6

   Reconnect

   Plug the electrical connector back in, ensuring the weather seal is seated.

7. 7

   Test and Calibrate

   Top up any lost transmission fluid. Connect Massey Ferguson Wintest or EDT diagnostic software to clear the 4.00.9B fault code. It is highly recommended to perform a clutch/transmission calibration after replacing transmission solenoids to ensure smooth engagement.