Massey Ferguson 04.00.B0 – TRANS: Issue With Transmission Actuator Communication On CAN BUS (TRANS)

The transmission controller has lost communication with the transmission actuator over the tractor's Controller Area Network (CAN) bus system.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8600 series
• 8727
• 8730
• 8732
• 8735
• 8737
• 8740

1. 1

   Check power supply fuses to the transmission actuator (e.g., F40 15 Amp on 8600 series) to ensure it is receiving power

2. 2

   Inspect the wiring harness running from the TRANS controller to the transmission actuator for chafed wires, pinch points, or heat damage

3. 3

   Check continuity of the CAN High and CAN Low twisted-pair wires between the actuator and the controller using a multimeter

4. 4

   Inspect the connector plug at the transmission actuator for moisture, corrosion, or pushed-out pins

5. 5

   Verify the actuator is receiving proper battery voltage and has a clean ground connection

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the negative battery terminal before beginning electrical work.

2. 2

   Fuse Replacement

   If the actuator fuse (e.g., F40) is blown, replace it. Reconnect the battery and turn the key on. If the fuse blows again immediately, trace the power wire for a short to ground.

3. 3

   Harness Repair

   If continuity testing reveals an open circuit or high resistance on the CAN bus lines, repair the damaged section of the twisted-pair wiring using OEM-approved splicing methods, or replace the affected harness section.

4. 4

   Clean Connections

   If the connectors are dirty or corroded, clean the pins thoroughly with electrical contact cleaner and apply a small amount of dielectric grease before reconnecting.

5. 5

   Replace the Actuator

   If the wiring, power, ground, and CAN bus continuity all test perfectly, the internal circuitry of the transmission actuator has likely failed. Remove the mounting hardware, disconnect the linkage/hydraulics (if applicable), and install a new OEM transmission actuator.

6. 6

   Clear Codes and Calibrate

   Reconnect the battery, use a diagnostic tool to clear the 04.00.B0 fault code, and perform any required transmission actuator calibrations as specified by the dealer software. Test drive the tractor to ensure Dyna-VT transmission ranges change smoothly.