John Deere 001569.31 – ECU: Engine In Active Derate Mode

The Engine Control Unit (ECU) has intentionally reduced the engine's power and/or speed as a protective measure. This is an informational code indicating that the engine is operating at reduced performance due to another detected active fault. It is not the root cause itself, but a symptom requiring further investigation of accompanying Diagnostic Trouble Codes (DTCs) to prevent engine damage.

• 6105M
• 6115M
• 6125M
• 6140M
• 6150M
• 6170M
• 318D

1. 1

   Review all active and stored fault codes using the onboard diagnostic display or John Deere Service ADVISOR to identify the root cause

2. 2

   Perform a visual inspection for loose or damaged wiring, corroded connectors, and fluid leaks

3. 3

   Check engine oil, coolant, and fuel levels, ensuring fluids are clean and of the proper type

1. 1

   Drain water separator (Fuel System Cause)

   If accompanying codes indicate water in fuel (e.g., ECU 000097.16), drain the fuel/water separator until only clean fuel is present.

2. 2

   Replace fuel filters (Fuel System Cause)

   If low fuel pressure codes are present (e.g., ECU 000094.17 / 000094.18, 000157.01), replace both the primary and final fuel filters as clogged filters are a common cause.

3. 3

   Inspect fuel lines (Fuel System Cause)

   Check for any leaks, blockages, or kinks in the fuel lines from the tank to the engine.

4. 4

   Check fuel tank (Fuel System Cause)

   Inspect the fuel tank for debris or contamination that could be clogging the fuel pickup.

5. 5

   Inspect fuel cooler (Fuel System Cause)

   Check if the fuel cooler is blocked or collapsed, which can restrict fuel flow.

6. 6

   Inspect and clean EGR valve (EGR System Cause)

   If EGR codes are present (e.g., ECU 000027.03 / 000027.04, SPN 2659 FMI 1 or 18), remove the EGR valve, clean any accumulated heavy soot deposits, and verify the valve moves freely.

7. 7

   Test EGR delta pressure sensor (EGR System Cause)

   Test the EGR delta pressure sensor and its wiring for proper voltage and continuity, as a faulty sensor sends incorrect flow data to the ECU.

8. 8

   Inspect EGR cooler (EGR System Cause)

   If experiencing white smoke and coolant loss, pressure test the cooling system to check for an internal leak in the EGR cooler.

9. 9

   Inspect turbo actuator wiring (Turbocharger Cause)

   If turbo codes are present (e.g., ECU 000641.09 / 000641.12, P0299), check the wiring harness and connector to the turbo actuator for damage, corrosion, or loose connections.

10. 10

    Test turbo actuator movement (Turbocharger Cause)

    Remove the actuator from the turbo and check if the internal vanes move freely by hand. If stuck, the turbocharger requires service.

11. 11

    Replace turbo actuator (Turbocharger Cause)

    If the turbo vanes move freely but the actuator is malfunctioning, replace the turbocharger actuator.