John Deere 522123.31 – FCC (Front Console Control / Dash Module): Incorrect CAN Bus Message, Information from PTA, PTD, or PTQ Control Software

A data transfer problem on the CAN bus where the Dash Module (FCC) is not receiving the expected operational messages regarding the Left-Hand Reverser (or Drive Lever) position from the transmission control software (PTA, PTD, or PTQ modules), causing incomplete or missing data regarding the tractor's forward/reverse directional command.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC
• 8245R
• 8400R
• 9470RT
• 9520RT
• 9570RT

1. 1

   Check for other active codes — diagnose any transmission (PTA, PTD, PTQ) or power supply codes first, as a failed transmission controller will stop broadcasting CAN messages

2. 2

   Inspect the physical operation of the Left-Hand Reverser / Drive Lever to ensure it clicks into its detents properly and is not physically damaged

3. 3

   Inspect the CAN bus wiring harness between the FCC (Dash Module), the Left-Hand Reverser, and the Transmission Control Unit for chafed wires, corrosion, or loose pins

4. 4

   Verify that the FCC and the transmission controllers are receiving proper unswitched and switched battery voltage (12V-14V) and have clean ground connections

1. 1

   Connect Diagnostic Equipment

   Hook up John Deere Service ADVISOR to the machine's diagnostic port. Pull all active and stored codes across all modules.

2. 2

   Address Root Modules First

   If communication with the PTA/PTD/PTQ transmission module is entirely lost, troubleshoot the power, ground, and CAN lines to the transmission controller.

3. 3

   Test the Reverser Circuit

   If the transmission controller is online but the reverser message is missing, disconnect the Left-Hand Reverser control assembly. Use a multimeter to check for continuity and verify that the reverser's internal sensors are sending the correct voltage sweeps/signals to the controller when moved between Forward, Neutral, and Reverse.

4. 4

   Perform Harness Continuity Test

   Pin out the CAN High and CAN Low lines between the FCC and the transmission controller. Resistance across the CAN bus should be approximately 60 ohms with the battery disconnected. Repair any open circuits or shorts to ground.

5. 5

   Replace Faulty Component

   If the wiring is intact and the transmission controller is functioning, but the reverser lever is dead or failing to output a signal, replace the Left-Hand Reverser Control Assembly.

6. 6

   Calibrate and Clear

   After replacing the reverser or repairing the harness, clear all codes. You may need to perform a reverser/transmission calibration via Service ADVISOR so the FCC and transmission modules relearn the lever's neutral, forward, and reverse detent positions.

7. 7

   Test Drive

   Start the tractor and shift between forward and reverse to ensure the code does not return and the transmission engages smoothly.