Kubota P2415 – Engine ECU: EGR (DC motor) temperature sensor failure

The Engine ECU receives an error signal from the EGR DC motor's internal temperature sensor (thermistor) via the CAN bus for 2.8 seconds or more, indicating an abnormally high temperature (often 125°C/257°F or more) or sensor circuit failure. This triggers limp home mode, stopping the EGR system and limiting engine output to approximately 75%.

• V3307
• V3800
• V3307-CR-TE4
• V3800-CR-TE4
• V3800-TIE4C
• M108X
• M5-091
• M5-111
• M6-101
• M6-111
• M6H-101
• M6L-111
• M6S-111
• SVL95-2
• SVL97-2
• Bobcat S630
• Bobcat S650
• Bobcat T630
• Bobcat T650
• KX080-3
• KX080-4

1. 1

   Check battery voltage to ensure the system has normal voltage, as low voltage can cause erroneous sensor readings.

2. 2

   Check for CAN bus codes to verify there is no active U0077 (CAN1 Bus off) DTC. If present, diagnose it first, as the ECU relies on the CAN bus to read the EGR temperature.

3. 3

   Inspect the EGR control line wiring harness between the Engine ECU and the EGR DC motor for chafing, shorts to ground, or disconnected pins.

4. 4

   Cycle the key switch to the OFF position, then back to ON. Clear past DTCs with a diagnostic tool and check if P2415 returns to confirm it is a hard fault.

1. 1

   Turn the machine's key switch to the OFF position and disconnect the battery to prevent electrical shorts.

   Turn the machine's key switch to the OFF position and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the EGR valve assembly on the intake/exhaust manifold side of the engine.

   Locate the EGR valve assembly on the intake/exhaust manifold side of the engine.

3. 3

   Disconnect the electrical harness connector from the EGR DC motor.

   Disconnect the electrical harness connector from the EGR DC motor.

4. 4

   Unbolt the EGR valve from the EGR cooler/manifold piping.

   Unbolt the EGR valve from the EGR cooler/manifold piping.

5. 5

   Remove the old EGR valve and thoroughly clean the mating surfaces to ensure no old gasket material remains.

   Remove the old EGR valve and thoroughly clean the mating surfaces to ensure no old gasket material remains.

6. 6

   Install the new EGR Valve Assembly using a new OEM gasket (never reuse the old metal gaskets or O-rings).

   Install the new EGR Valve Assembly using a new OEM gasket (never reuse the old metal gaskets or O-rings).

7. 7

   Torque the mounting bolts to the specification outlined in your specific machine's service manual.

   Torque the mounting bolts to the specification outlined in your specific machine's service manual.

8. 8

   Reconnect the EGR DC motor electrical harness.

   Reconnect the EGR DC motor electrical harness.

9. 9

   Reconnect the battery, turn the key ON, and use a diagnostic tool to clear the P2415 fault code.

   Reconnect the battery, turn the key ON, and use a diagnostic tool to clear the P2415 fault code.

10. 10

    Start the engine and verify that the engine warning light remains OFF and that the machine has regained full power (100% output).

    Start the engine and verify that the engine warning light remains OFF and that the machine has regained full power (100% output).