Massey Ferguson 4.01.9A – TRANS2: Issue With Powershift L Solenoid Supply Voltage

The transmission controller has detected an electrical irregularity—such as a voltage drop, open circuit, or short circuit—in the power supply circuit dedicated to the "L" solenoid on the powershift transmission valve block.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 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 tractor's battery is fully charged (approx. 12.6V resting) and the alternator is outputting correct voltage. Low system voltage can trigger false solenoid supply codes.

2. 2

   Trace the wiring harness from the TRANS2 module to the transmission valve block. Look for chafed wires, melted insulation, or pinch points.

3. 3

   Disconnect the plug at the Powershift L Solenoid. Inspect for water ingress, corrosion, or pushed-back pins. Clean with electrical contact cleaner and apply dielectric grease.

4. 4

   With the key ON, use a multimeter to check for proper supply voltage at the solenoid connector.

5. 5

   Measure the internal resistance (Ohms) across the pins of the Powershift L Solenoid. If it reads out of specification (open line or dead short), the solenoid coil has failed internally and requires replacement.

1. 1

   Prep the Machine

   Park the tractor on a level surface, lower all implements, turn off the engine, and disconnect the negative battery cable.

2. 2

   Locate the Solenoid

   Locate the transmission control valve block (typically mounted on the side of the transmission housing). Identify the specific "L" solenoid.

3. 3

   Clean the Area

   Thoroughly clean the area around the valve block with brake cleaner or compressed air to prevent dirt from entering the hydraulic system during removal.

4. 4

   Disconnect Wiring

   Unplug the electrical connector from the L solenoid.

5. 5

   Remove the Solenoid

   Remove the retaining bolts or snap-ring securing the solenoid to the valve block. Carefully pull the solenoid straight out.

6. 6

   Install the New Part

   Lubricate the O-rings on the new solenoid with clean transmission fluid. Insert it into the valve block and torque the retaining bolts to OEM specifications.

7. 7

   Reassemble

   Reconnect the electrical harness to the new solenoid. Reconnect the battery.

8. 8

   Clear Codes and Test

   Use a diagnostic tool to clear the 4.01.9A / 04.02.9A fault code from the TRANS2 module. Start the tractor and test the powershift functions through all gears to ensure smooth engagement.