John Deere 639.14 – Multiple (ETC, ICU, BIF, ATC, JDL, PL3, UIC): Vehicle CAN BUS, Very High Error Rate

A control unit is detecting an excessively high error rate on the machine's J1939 CAN BUS network. It means there are too many incorrect messages being transmitted or received, or there is a general connectivity problem causing communication disruptions.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6120-6420
• 6230
• 6330
• 6430
• 6170R
• 7130
• 7230
• 7430
• 7530
• 8110-8410
• 8220
• 8420
• 8235R
• 8260R
• 8285R
• 9230
• 9330
• 9430
• 9530
• 9630
• 9510R
• 4930
• 944K Hybrid
• E360
• E360LC
• 643L-II

1. 1

   Visually inspect all CAN BUS network wiring, harnesses, and connectors for signs of damage, corrosion, looseness, or moisture intrusion.

2. 2

   Use a multimeter to check the CAN BUS termination resistors (a healthy J1939 network should have two terminating resistors maintaining proper resistance).

3. 3

   Check for voltage stability and ensure all modules have clean, secure grounds to rule out electrical interference.

4. 4

   Systematically isolate modules by disconnecting terminators, transceivers, and ECUs one by one to see if a specific malfunctioning module is crashing the bus.

5. 5

   Use John Deere Service Advisor or an oscilloscope to monitor CAN BUS traffic for signal degradation, excessive errors, or proprietary message disruptions.

1. 1

   Secure and Clean Connections

   If looseness or corrosion is found during diagnostics, clean the pins and secure the connectors to restore reliable communication.

2. 2

   Repair Wiring

   Repair or replace any damaged, chafed, or broken sections of the CAN BUS wiring harness. Ensure proper harness protection and connector sealing are applied.

3. 3

   Replace Terminating Resistors

   If the network resistance is out of specification (indicating a missing or burnt resistor), locate and replace the faulty CAN Bus terminating resistor.

4. 4

   Replace Faulty Modules

   If a specific control unit (e.g., SCV controller, transmission module) is found to be internally shorted and pulling down the network, replace the defective hardware.

5. 5

   Update and Reconfigure Software

   Apply any available firmware or software updates to the control units. Reconfigure the network settings to ensure communication compatibility and clear the error codes.