John Deere 522495.09 – Engine Control Unit (ECU): Communication Error of Exhaust Filter Temperature Module

Indicates a data transfer problem on the CAN Bus network where the Engine Control Unit (ECU) is unable to receive communication messages from the exhaust filter temperature module. Without this data, the system cannot properly manage exhaust regeneration or in-cylinder fuel dosing, often resulting in an engine derate.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5090M
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 5075M
• 5075E
• 8245R to 8400R
• 8310RT
• 8335RT
• 8360RT
• 9420R
• 9470R
• 9520R
• 210G
• 250GLC
• 350GLC
• 470GLC
• 544K
• 644K
• 744K
• 844K
• 750K
• 850K
• 1050K
• 670G
• 772G
• 872G
• R4030
• R4038
• R4045

1. 1

   Inspect the CAN Bus wiring harness between the ECU and the exhaust filter temperature module for damaged, frayed, or loose wires caused by rodent damage or weather corrosion.

2. 2

   Check the connector going to the temperature module to verify it is secure, fully seated, and free of moisture or corrosion.

3. 3

   Test CAN Bus communication to the module using John Deere Service Advisor or a compatible diagnostic tool to ensure there are no network interruptions.

4. 4

   Verify the module is receiving proper voltage and ground to rule out a power supply issue before condemning the module itself.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical shorts during repair.

2. 2

   Repair Wiring

   If the diagnostic checks revealed frayed wires or corroded pins, repair the CAN Bus wiring harness or replace the connector pigtail.

3. 3

   Replace the Module

   If the wiring is good, locate the Exhaust Filter Temperature Module (mounted near the DOC/DPF assembly). Disconnect the electrical connector and unbolt the module from its mounting bracket. Install the new module and reconnect the harness.

4. 4

   Reassemble and Reset

   Reconnect the battery. Connect a diagnostic tool to clear the 522495.09 fault code from the ECU.

5. 5

   Test Run

   Start the engine and monitor the exhaust temperature readings via the diagnostic tool to ensure the ECU is successfully receiving data and the system is operating normally.