John Deere 1231.14 – PL1: Drive Train CAN Bus (1000 kBd), High Error Rate

Generated when the control software receives too many incorrect CAN Bus messages. It indicates a general communication breakdown, interference, or a physical connection problem on the high-speed Drive Train CAN Bus network.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R

1. 1

   Inspect all Drive Train CAN Bus wiring for physical damage, chafing, loose connections, or corrosion

2. 2

   Use a diagnostic tool (such as John Deere Service ADVISOR) to monitor the Drive Train CAN Bus traffic for excessive errors or interference

3. 3

   Inspect the PL1 control unit and other connected devices on the bus for internal hardware faults that may be flooding the network with errors

4. 4

   Check if the control software is up-to-date, as outdated software can sometimes contribute to communication errors

1. 1

   Secure Connections

   Ensure all CAN Bus connectors leading to the PL1 Gear Shift Module are secure, properly seated, and free of moisture or debris.

2. 2

   Repair Wiring

   If any damaged wiring or faulty connections are found during the visual inspection, repair or replace the affected harness section.

3. 3

   Isolate the Fault

   If the wiring is intact, use your diagnostic tool to isolate modules on the Drive Train CAN Bus. If disconnecting a specific module clears the high error rate on the rest of the bus, that module is likely the source of the disruption.

4. 4

   Replace the Module

   If the PL1 module itself is identified as the source of the hardware fault, replace the Gear Shift Module Direct Drive.

5. 5

   Update Software

   Flash the new module (or existing modules) with the latest control software to minimize future communication errors.

6. 6

   Clear and Test

   Clear the diagnostic trouble codes and test drive the tractor to verify that full DirectDrive functionality has returned and the error rate remains normal.