John Deere 000247.09 – CCU: Power Train CAN Bus Communication Failure

The Chassis Control Unit (CCU) detects that messages from the Engine Module are missing on the Power Train CAN bus. The .09 Failure Mode Identifier (FMI) indicates an abnormal update rate, meaning a controller has lost communication with another essential device on the network. This loss of communication can lead to the engine defaulting to idle, loss of throttle response, and the machine failing to start.

• 3033r
• 4730
• 6700
• 7000 Series
• 7200
• 7210
• 7400
• 7410
• 7510
• 7600
• 7610
• 7700
• 7710
• 7800
• 7810
• 5065M
• 9630T

1. 1

   Check for other active or stored fault codes, as communication errors often trigger a cascade of codes in different controllers.

2. 2

   Inspect all relevant fuses, including the 20-amp mini fuse near the battery, for blown elements or internal corrosion.

3. 3

   Ensure the battery is well-charged and that all battery cables and ground connections are clean and tight.

4. 4

   Visually inspect the Power Train CAN bus wiring harness and connectors (especially on the CCU and ECU) for chafing, pinching, or corrosion.

5. 5

   With machine power off, measure resistance between CAN High and CAN Low at a diagnostic connector (should be approximately 60 ohms; 120 ohms indicates a missing/failed resistor, significantly lower indicates a short or faulty controller).

6. 6

   With machine power on, check DC voltage of CAN wires relative to ground (CAN High should be 2.5-3.0V, CAN Low should be 2.0-2.5V).

7. 7

   Isolate controllers by unplugging them one at a time from the CAN bus (starting with the Engine Module, then CCU) and re-checking for the fault code.

1. 1

   Address power supply issues

   Replace any blown or corroded fuses, clean and tighten battery connections, and charge the battery if voltage is low.

2. 2

   Repair CAN bus wiring

   If physical damage, chafing, or corrosion is found during visual inspection, repair or replace the affected section of the wiring harness.

3. 3

   Replace terminating resistors

   If the resistance check reads 120 ohms or otherwise indicates a faulty terminator, replace the terminating resistors.

4. 4

   Replace faulty controller

   If isolation testing identifies a specific controller (such as the Engine Module or CCU) as the source of the communication failure, replace the faulty controller.