John Deere 524178.19 – PTA (Transmission Module IVT): Missing Info On The CAN BUS, Transmission Module IVT (PTA)

The TIA or PLC (Rear Chassis Module) control software is unable to determine the diagnostic status of the B84 Wheel Speed Sensor. Because the module cannot read the sensor, it cannot provide the CAN BUS with relevant transmission output speed data, triggering a critical communication error in the transmission control software.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430

1. 1

   Check the PLC (Rear Chassis Module) for active priority codes (such as PLC 328012.31 or 524109.10) indicating a direct fault with the B84 wheel speed sensor

2. 2

   Verify that the B84 wheel speed sensor is operating correctly and providing accurate readings

3. 3

   Inspect all wiring and connectors associated with the CAN BUS and the B84 wheel speed sensor for physical damage, corrosion, open circuits, or shorts

4. 4

   Ensure the PLC control unit is correctly processing and transmitting signals (PLC software may need an update)

1. 1

   Access the Sensor

   Locate the B84 wheel speed sensor and its associated wiring harness on the transmission/axle housing.

2. 2

   Perform Visual & Electrical Inspection

   Check the wiring harness and connectors for any damage, loose pins, or corrosion.

3. 3

   Repair Wiring

   Repair or replace any faulty wiring or connectors to ensure proper electrical continuity to the CAN BUS.

4. 4

   Replace the Sensor

   If the wiring is intact but the sensor fails testing (or if a priority PLC code indicates a dead sensor), remove the faulty B84 wheel speed sensor and install a replacement.

5. 5

   Clean and Secure

   Make sure all connections are clean, seated properly, and secure.

6. 6

   Clear Codes and Test

   Clear the fault codes from both the PTA/TCU and PLC modules. Test drive the tractor to ensure the wheel speed is recognized by the control unit and the code does not return. If the issue persists, consult dealer technical support for a potential PLC software reflash.