Massey Ferguson 13.02.04 – TRANS1: Air Brake Park Brake Solenoid Issue

This code is triggered when the transmission control system detects an electrical anomaly—such as an open circuit, short circuit to ground/power, or an abnormal amperage draw—in the circuit for the solenoid that controls the pneumatic (air) parking brake system.

• 7724S
• 5712SL
• 7722S
• 7722
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5600 Series
• 5608
• 5613
• 5700 SL Series
• 6700 S Series
• 7600 Series
• 7614
• 7626
• 7700 Series
• 7700 S Series

1. 1

   Inspect the wiring harness and the connector leading to the Air Brake Park Brake Solenoid for chafing, breaks, or corrosion.

2. 2

   Disconnect the solenoid and use a multimeter to measure the resistance across the coil pins. Compare the reading to the OEM specification (an open reading or a dead short indicates a failed internal coil).

3. 3

   With the key ON, check the supply voltage from the TRANS1 controller to the solenoid connector to ensure the module is sending the correct signal and that the ground circuit is intact.

4. 4

   Ensure the tractor's air brake system is building and maintaining proper pneumatic pressure, as low pressure can sometimes cause secondary engagement issues, though this specific code is primarily electrical.

1. 1

   Secure the Machine

   Park the tractor on level ground. Because you are working on the parking brake system, you must securely chock the wheels to prevent the tractor from rolling.

2. 2

   Locate the Solenoid

   Locate the air brake control valve block (typically mounted near the transmission housing or rear axle air tanks, depending on the specific chassis).

3. 3

   Disconnect Electricals

   Disconnect the wiring harness from the Air Brake Park Brake Solenoid.

4. 4

   Remove the Solenoid

   Depending on the valve design, either remove the retaining nut at the top of the stem to slide the electromagnetic coil off, or unbolt the entire solenoid valve assembly from the manifold.

5. 5

   Install the New Part

   Slide the new solenoid coil onto the valve stem (or install the new valve assembly). Ensure any O-rings are lightly lubricated and seated properly to prevent air leaks. Torque the retaining nut/bolts to OEM specifications.

6. 6

   Reconnect and Clear Codes

   Reconnect the electrical harness. Use a compatible diagnostic tool (such as Jaltest AGV or Massey Ferguson EDT) to clear the 13.02.04 fault code from the TRANS1 module.

7. 7

   Operational Test

   Start the tractor, allow the air pressure to build, and cycle the park brake switch multiple times to ensure the brake engages/disengages correctly and the code does not return.