John Deere 1569.31 – ECU: Engine in Power Derate Condition

An informational/symptom code indicating the control unit has detected a critical condition (such as overheating, low fuel pressure, or emissions system faults) and is actively limiting the maximum amount of fuel available to the engine to prevent catastrophic damage.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5065M
• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5090M
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7220
• 7320
• 7420
• 7520
• 8235R
• 8330
• 9230
• 9410R
• 319D
• 328D
• 329D
• 750K
• 540G-III
• 548G-III
• 9770
• JD 4045HF285

1. 1

   Access the machine's message center or connect John Deere Service Advisor to read all active and stored ECU codes

2. 2

   Identify the root cause by looking for accompanying primary codes (e.g., Coolant Temperature High, Low Fuel Pressure, Water in Fuel, EGR System Faults, or Turbocharger Issues)

3. 3

   If fuel codes are present, check fuel filter condition and drain the fuel/water separator

4. 4

   If temperature codes are present, check the engine coolant level and inspect the radiator for debris

5. 5

   If EGR or sensor codes are present, test sensor wiring harnesses for proper 5-volt reference and ground

1. 1

   Read All Codes

   Turn the key ON (engine off) and document every active and stored code in the ECU.

2. 2

   Ignore 1569.31 Temporarily

   Do not attempt to 'fix' the derate code itself. It is merely a software response.

3. 3

   Repair the Primary Fault

   Follow the OEM diagnostic procedure for the other codes present. If fuel codes are present: Replace the primary and secondary fuel filters, drain the water separator, and verify lift pump operation. If temperature codes are present: Clean the radiator fins, verify the coolant fill valve is closed, and check for pinched hoses. If EGR codes are present: Perform a harness wiggle test, verify 5V power/ground to the EGR Delta Pressure Sensor, and replace the sensor if voltage readings are unstable.

4. 4

   Clear Codes and Test

   Once the root cause is repaired, use the diagnostic tool or monitor to clear all stored codes. Start the engine and apply a load to verify the derate condition has lifted and no codes return.