John Deere 522125.31 – FCC (Front Console Control / Dash Module): CAN BUS Message Issue With Communication Between the Dash Module And Other Modules

The Dash Module is not receiving the expected CAN bus messages from the powertrain/transmission control software (PTA, PTD, or PTQ), indicating an issue with the CAN bus communication network itself or a failure at the transmitting control module.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 9470RT
• 9520RT
• 9570RT

1. 1

   Check for other active fault codes from the PTA, PTD, or PTQ transmission modules (e.g., low voltage or loss of power)

2. 2

   Visually inspect the CAN bus wiring harness connecting the FCC (Dash Module) to the transmission/powertrain controllers for chafing, pinches, or breaks

3. 3

   Inspect the harness connectors at the FCC and the PTA/PTD/PTQ modules for loose pins, moisture intrusion, or corrosion

1. 1

   Address Transmitting Module Faults

   If the PTA, PTD, or PTQ modules have active codes (e.g., low voltage or loss of power), diagnose and repair those first. Restoring the transmitting module will often clear the FCC communication code.

2. 2

   Test CAN Bus Integrity

   Using a multimeter, test the CAN High and CAN Low lines between the FCC and the transmission controllers for continuity. Verify that the CAN bus terminating resistors are reading the correct resistance (typically 60 ohms across the network when powered down).

3. 3

   Repair Wiring

   If an open circuit, short to ground, or short to power is found in the CAN lines, repair the damaged section of the wiring harness or replace the damaged connector pins.

4. 4

   Software/Module Replacement

   If the wiring is fully intact and the transmitting modules are functioning properly, the FCC module itself may be failing to interpret the messages. A software reflash by a dealer may be required. If the hardware has failed, the FCC module must be replaced.