New Holland ENG 3263 – Engine Control Module (ECM): ECM Bus Off on CAN C

Indicates an internal condition where the control module has dropped off or suspended communication on the CAN C network. This is triggered by electronic disturbances, an incorrect application of injection parameters, a requested torque increase via a diagnostic tester, or a defective internal ECU.

• T8.xxx Series
• B110
• B110B
• LB110
• B115
• LB115
• CR Series
• CR9090
• CX Series
• CX8080
• CX8090
• Magnum 235–340 (Series 4)
• Case 580 Super N
• Case 590 Super N
• Case 695 Super N

1. 1

   Check for electronic disturbances such as high battery voltage, defective wiring, or poor grounds that could cause electrical noise on the CAN C bus

2. 2

   Verify the injection relevant application to ensure the correct software and calibration files are flashed to the ECM

3. 3

   Clear the fault code and retest, as a simple reset may resolve the issue if triggered by a diagnostic tester requesting a torque increase

1. 1

   Inspect CAN C Wiring

   Locate the ECM and disconnect the main harnesses. Inspect the CAN C bus pins and connectors for corrosion, pushed-out pins, or moisture.

2. 2

   Test Voltage and Grounds

   Measure the voltage supply to the ECM and test the main ground connections. Excessive voltage or a floating ground can cause the ECM to shut down its CAN transceiver to protect itself.

3. 3

   Re-flash the ECM

   If the wiring is intact, use the CNH Electronic Service Tool (EST) to verify the ECM's software. Re-flash or update the ECM with the correct injection application parameters.

4. 4

   Replace the ECM

   If the failure persists after reinstallation and all wiring/voltage checks pass, the internal CAN transceiver in the ECU is defective. The ECM must be replaced and programmed to the machine.