Massey Ferguson 13.03.0B – TRANS1: Hydraulic Trailer Brake Solenoid Issue

The transmission control system has detected a malfunction in the electrical circuit of the solenoid responsible for actuating the hydraulic trailer brakes. This is typically an electrical fault, such as an open circuit, a short to ground, a short to power, or an abnormal amperage draw.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710SL
• 5711SL
• 5712SL
• 5713SL
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Clear the fault codes using a diagnostic tool and operate the tractor to see if 13.03.0B returns to confirm whether the fault is currently active.

2. 2

   Inspect the wiring harness connecting the TRANS1 module to the hydraulic trailer brake solenoid on the transmission valve block for chafed wires, corrosion, moisture ingress, or loose pins.

3. 3

   Disconnect the solenoid and use a multimeter to check the resistance (ohms) across the solenoid coil pins (an open line or zero ohms indicates internal failure).

4. 4

   Check the wiring harness for continuity between the solenoid connector and the TRANS1 controller.

5. 5

   Test the circuit for a short to ground or a short to battery voltage.

1. 1

   Preparation

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

2. 2

   Locate the Component

   Locate the hydraulic trailer brake solenoid on the Dyna VT transmission's hydraulic control valve block.

3. 3

   Disconnect

   Unplug the electrical harness connector from the faulty solenoid.

4. 4

   Removal

   Clean the area around the solenoid to prevent dirt from entering the hydraulic system. Remove the retaining hardware (usually a nut or hex bolts) holding the solenoid cartridge in place. Carefully extract the solenoid, being prepared with a rag to catch any residual hydraulic fluid.

5. 5

   Installation

   Lubricate the O-rings on the new hydraulic trailer brake solenoid with clean hydraulic fluid. Insert the new solenoid into the valve block and tighten the retaining hardware to the OEM torque specification.

6. 6

   Reconnection

   Reconnect the electrical harness to the new solenoid.

7. 7

   Testing

   Reconnect the battery, start the tractor, and clear the fault codes. Actuate the trailer brakes to ensure proper operation, check for hydraulic leaks at the valve block, and verify that the 13.03.0B code does not return.