Massey Ferguson 04.03.6A – Autotronic 5: Issue With Range 4 Solenoid Valve (TRANS1)

The transmission controller has detected an electrical fault or operational inconsistency with the Range 4 shift solenoid (designated in OEM schematics as L55). The system typically logs this when it detects an open circuit, a short circuit to +12V, a short circuit to 0V, or an inconsistency between the Range 4 solenoid valve (L55) and the Range 4 position switch (L59).

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5709
• 6612
• 6613
• 6614
• 6615
• 6616
• 6712S
• 6713S
• 6714S
• 7619
• 7620
• 7624

1. 1

   Electrical Resistance Test: Disconnect the L55 Range 4 solenoid valve and measure the coil resistance. A healthy OEM solenoid should measure approximately 10 Ohms.

2. 2

   Wiring Harness Inspection: Trace the wiring from the Autotronic 5 controller to the L55 solenoid. Look for chafed wires causing a short to ground (0V) or short to power (+12V), as well as broken wires causing an open circuit.

3. 3

   Switch Consistency Check: The Autotronic 5 module monitors the Range 4 position switch (L59) to confirm the physical shift. Test the L59 switch to ensure it is not stuck or sending a conflicting signal, which can trigger the code even if the solenoid is fine.

4. 4

   CAN Bus Check: Ensure there are no accompanying CAN communication errors between the instrument panel and the Autotronic 5 module, which can sometimes cause false transmission codes.

1. 1

   Locate the Solenoid

   The transmission control solenoid valves (L52, L53, L54, and L55) are located on the right-hand side of the gearbox control selector rail. L55 is specifically the Range 4 valve.

2. 2

   Clean the Area

   Thoroughly clean the exterior of the transmission housing around the solenoid block to prevent dirt from entering the hydraulic circuit.

3. 3

   Disconnect Wiring

   Unplug the electrical connector from the L55 solenoid.

4. 4

   Remove the Valve

   Remove the retaining screws and the flange holding the L55 solenoid valve in place. Pull the solenoid valve straight out of the housing.

5. 5

   Install the New Valve

   Lubricate the O-rings on the new solenoid valve with clean transmission fluid. Insert it into the port and seat it fully.

6. 6

   Secure and Reconnect

   Reinstall the flange and tighten the retaining screws to the OEM specified torque. Reconnect the electrical harness.

7. 7

   Clear Codes and Test

   Use a diagnostic tool to clear the 04.03.6A fault code. Start the tractor, bring it to operating temperature, and test drive it through all ranges to ensure Range 4 engages smoothly and the code does not return.