Massey Ferguson T240 – Transmission Control Unit (TRANS or TRANS2): Issue With Powershift P Solenoid Supply Voltage

The measured current for the Powershift module solenoid valve P (Component X478) exceeds the maximum possible limit of 1.4 Amps, indicating a short circuit to ground in the wiring harness or an internal short within the solenoid coil itself.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 5400 Series
• 5600 Series
• 5700 Series
• 5709
• 5710
• 5711
• 5710 SL
• 5711 SL
• 5712 SL
• 5713 SL
• 6400 & 6600 Series
• 6700 Series
• 7600 Series
• 7700 Series
• 7714
• 7715
• 7716
• 7718
• 7719
• 7720
• 7722
• 7724
• 7726

1. 1

   Trace the wiring harness between the Transmission controller and the Powershift module solenoid valve P (X478) for chafed wires, melted insulation, or pinched lines that could cause a short circuit to ground.

2. 2

   Disconnect the X478 solenoid and inspect the connector pins for corrosion, water ingress, or damage.

3. 3

   Perform a circuit isolation test: with the solenoid disconnected, turn the key on and check if the T240 code changes to T241 (Open circuit). If it does, the wiring is likely intact, pointing to a faulty solenoid.

4. 4

   Using a multimeter, measure the resistance of the X478 solenoid coil. Low resistance indicates an internal short causing it to draw more than the 1.4A threshold.

1. 1

   Prepare tractor for repair

   Park the tractor on a level surface, engage the parking brake, turn off the engine, and disconnect the battery to prevent electrical spikes.

2. 2

   Locate valve block

   Locate the Powershift valve block module on the side of the transmission housing.

3. 3

   Identify solenoid

   Identify the X478 Powershift P solenoid valve (refer to your specific model's service manual diagram if necessary, as it sits alongside the L and N solenoids).

4. 4

   Disconnect solenoid

   Depress the locking tab and disconnect the electrical connector from the solenoid.

5. 5

   Repair wiring

   If the wiring harness was found to be damaged during diagnostics, splice and repair the wires using weather-sealed heat shrink connectors.

6. 6

   Remove faulty solenoid

   If the solenoid failed the resistance test, unbolt/unscrew the faulty X478 solenoid valve from the Powershift module. Have a catch pan ready for minor hydraulic oil spillage.

7. 7

   Install new solenoid

   Lubricate the O-rings on the new OEM solenoid valve with clean transmission fluid and install it into the valve block. Torque to OEM specifications.

8. 8

   Reconnect connector

   Reconnect the electrical connector securely.

9. 9

   Reconnect battery

   Reconnect the battery.

10. 10

    Test and clear codes

    Start the tractor, clear the stored fault codes using a diagnostic tool (or via the dash interface, depending on the model), and test the powershift ranges to ensure the code does not return and shifting is smooth.