John Deere 000237.12 – CCU: Serial Number Mismatch Main Control Module

A mismatch has been detected between the tractor's serial number and the serial number stored in the Main Control Module (CCU). This indicates a conflict in the vehicle identification information between different control units on the tractor's CAN bus network. This condition typically occurs if a control unit has been replaced with one from another machine without proper configuration, or if there is a software programming issue.

• 6110M
• 6120M
• 6125M
• 6130M
• 6135M
• 6140M
• 6145M
• 6155M
• 6175M
• 6195M

1. 1

   Verify it is an active fault by accessing the diagnostic trouble codes, clearing the code, operating the machine, and rechecking to see if it returns.

2. 2

   Using John Deere Service ADVISOR, check the Vehicle Identification Number (VIN) stored in all electronic control units on the machine to identify the source of the mismatch.

3. 3

   Inspect the battery and charging system for low voltage, as very low system voltage during startup can cause communication errors between modules and trigger this fault.

1. 1

   Connect diagnostic tool

   Connect the John Deere Service ADVISOR diagnostic tool to the tractor.

2. 2

   Reprogram control module

   Download the correct software payload from John Deere's internal network and flash it to the CCU and any other mismatched modules to correct the VIN mismatch.

3. 3

   Clear codes and verify repair

   After reprogramming, clear all diagnostic trouble codes. Start the tractor and run a full functional check to ensure the code does not reappear and all systems operate normally.

4. 4

   Replace Main Control Module

   If the fault code persists after reprogramming and all VINs appear to match (indicating an internal failure), replace the Main Control Module (CCU). The new module must be programmed by a dealer.