Kubota U0076 – Engine ECU: No Communication with EGR

The engine control module is unable to communicate with the Exhaust Gas Recirculation (EGR) valve over the machine's CAN bus network. This results in engine derate, emissions failure, and DPF regeneration lockout.

• LX3310
• M6060
• M5-091
• M5-111
• M6-101
• M6-111
• M6S-111
• SSV65
• SSV75
• SVL65-2
• SVL75-2
• SVL95-2
• SVL97-2
• KX080-4
• TL6R
• LM3210

1. 1

   Verify battery voltage is normal, as low voltage can cause false CAN communication errors.

2. 2

   Check for accompanying CAN codes (e.g., U0077, U0081, or U0082). If present, the issue is likely a broader CAN network failure (short/open circuit) rather than the EGR valve itself.

3. 3

   Turn the key switch to the 'OFF' position and inspect the wiring harness and electrical connector at the EGR valve. Look for tapped wires (e.g., aftermarket lights spliced into the harness), corrosion, or broken pins that could interrupt the CAN signal.

1. 1

   Power Down

   Turn the machine's key switch to the OFF position.

2. 2

   Harness Repair

   If diagnostic checks reveal a broken wire, short to ground, or loose connector on the CAN bus lines leading to the EGR valve, repair the wiring harness or replace the pigtail connector.

3. 3

   EGR Valve Replacement

   If the wiring and CAN network are intact but communication cannot be established, the electronic module on the EGR valve has failed. Remove the EGR valve assembly and install a new OEM EGR valve and gasket.

4. 4

   Clear Codes

   Reconnect the battery, turn the key ON, and use a diagnostic tool (such as Kubota Diagmaster) to clear the U0076 fault code.

5. 5

   Force Regeneration

   Because this code inhibits DPF regeneration, soot may have accumulated. Once the code is cleared and communication is restored, perform a forced parked regeneration to clear the DPF.