John Deere 520425.07 – CSM / AIC / CCU / RLC / CSC / OIC / TEC / SFA: Vehicle CAN Bus Error Counter High / Received CAN Bus Messages, High Error Rate

Triggered when the error counter for the vehicle's Controller Area Network (CAN) Bus reaches an unusually high level. It indicates persistent communication errors within the CAN Bus network, which are typically caused by electrical noise/interference, faulty wiring connections, missing termination resistors, or incompatible/malfunctioning devices overloading the network.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 8245R to 8400R
• 9470RT
• 9520RT
• 9570RT
• 210K EP Tractor Loader
• 310K Backhoe Loader
• 750J Crawler Dozer

1. 1

   Inspect the CAN Bus Network: Perform a thorough visual and physical inspection of the CAN bus wiring harness for physical damage, chafing, loose connections, or corrosion at the connectors.

2. 2

   Verify Termination Resistors: Ensure that proper termination resistors are installed at both ends of the CAN bus network. Incorrect or failed termination (which should typically measure ~60 ohms across the CAN High and CAN Low pins with the battery disconnected) will lead to high error rates.

3. 3

   Check for Electrical Interference: Ensure there are no sources of electrical interference (such as unshielded aftermarket equipment) routed near the CAN bus network.

4. 4

   Monitor CAN Bus Load: Use John Deere Service ADVISOR or compatible diagnostic software to monitor CAN Bus traffic. Identify if a specific node/device is incorrectly configured, malfunctioning, or flooding the network.

5. 5

   Software Verification: Ensure the control software on the affected module (e.g., CSM, AIC) is updated to the latest version to address any known message processing bugs.

1. 1

   Disconnect Power

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

2. 2

   Repair/Replace Wiring

   If physical defects were found during the diagnostic phase, repair the damaged wires using an approved CAN bus wiring repair kit, or replace the compromised harness section.

3. 3

   Replace Faulty Components

   If a termination resistor tests out of specification (not 120 ohms individually), replace it. If a specific module (like the CSM or AIC) is found to be internally shorting the CAN network, replace the module.

4. 4

   Reconfigure Devices

   Ensure all devices on the network are properly configured and functioning within their specified parameters.

5. 5

   Clear and Retest

   Reconnect the battery, turn the key switch ON, and use diagnostic software to reset the error counter. Monitor the CAN Bus operation to ensure error rates remain low and normal functionality is restored.