John Deere 520873.02 – Rear Chassis Module (SCC): Internal control software or hardware fault when reading/writing to the internal memory module (EEPROM)

Fault code 520873.02 indicates an internal control software or hardware fault when reading/writing to the internal memory module (EEPROM). The EEPROM stores critical calibration data and operational parameters. When this fault is triggered, the control software's reaction is typically to limit the functionality of the affected module or render it completely invalid.

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

1. 1

   Verify the unswitched and switched supply voltage to the SCC to rule out low voltage or severe voltage drops during cranking

2. 2

   Inspect the wiring harness and connectors leading to the Rear Chassis Module for corrosion, moisture intrusion, or loose pins

3. 3

   Clear the diagnostic trouble code (DTC) and cycle the tractor's key power to determine if the fault is a transient voltage spike or a permanent hard fault

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent any electrical shorts.

2. 2

   Locate the SCC

   Access the Rear Chassis Module (location varies slightly by cab configuration, typically mounted near the rear chassis/fender harness junction).

3. 3

   Remove the Module

   Disconnect the multi-pin harness connectors from the SCC and unbolt the module from its mounting bracket.

4. 4

   Install Replacement

   Mount the new SCC and reconnect the wiring harnesses.

5. 5

   Reprogramming (Dealer Required)

   An authorized John Deere dealer must connect to the tractor using the Service ADVISOR tool to flash the correct software payload to the new module and calibrate the rear chassis functions (such as SCVs, rear PTO, and hitch settings).