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5246.16

John Deere 5246.16 – ECU: SCR Operator Stage #2 Derate Notification

Issue description

Informational fault code notifying the operator that the Selective Catalytic Reduction (SCR) emissions system has an active fault, warning how much time remains before the machine reaches its final engine derate state.

Applies to these machines

  • 5085E
  • 5090E
  • 5090EL
  • 5100E
  • 5090M
  • 5100M
  • 5100MH
  • 5100ML
  • 5115M
  • 6110M
  • 6120M
  • 6130M
  • 6145M
  • 6155M
  • 6175M
  • 6195M
  • 6110R
  • 6120R
  • 6130R
  • 6145R
  • 6155R
  • 6175R
  • 6195R
  • 6215R
  • 6R Series
  • 7R Series
  • 8R Series
  • 9R Series
  • 6105M
  • 8245R
  • 8400R
  • 9470RT
  • 9520RT
  • 9570RT
  • S-Series
  • S680
  • S780
  • T-Series
  • T550
  • 8000 Series
  • 9000 Series
  • 8400
  • 8600
  • 9800

Check the cause

  1. Connect a diagnostic tool (like John Deere Service ADVISOR) and pull all active ECU codes to identify the root-cause emissions fault (e.g., DEF Dosing Unit, DOC, or NOx sensors)

  2. Verify that the Diesel Exhaust Fluid (DEF) tank is adequately filled and that the fluid is high-quality and uncontaminated

  3. Check the operator manual for specific timelines regarding the SCR derate stages for your exact machine to know how much operating time remains before final derate

Repair steps

  1. Address the Root Fault

    Perform the specific repair dictated by the primary SCR/DEF fault code found during your diagnostic check (e.g., replacing a failed NOx sensor, unclogging a DEF dosing pump, or forcing a DPF regeneration).

  2. Refill DEF

    If the derate was caused by low or poor-quality DEF, drain the tank (if contaminated) and refill it with fresh, high-quality DEF.

  3. Reset the ECU

    Once the mechanical or chemical issue is resolved, use the diagnostic tool to clear the codes and reset the ECU. This will clear the 005246.16 notification.

  4. Monitor the System

    Run the machine under load to ensure the SCR system is functioning correctly and the derate countdown does not return.

Parts you might need

(12)

  • Nitrogen Oxide (NOx) Sensor / Chemical Sensor

    DZ110621

    Measures NOx levels in exhaust gases. Often manufactured by Continental or Bosch for John Deere.

  • Nitrogen Oxide (NOx) Sensor / Chemical Sensor

    DZ109125

    Measures NOx levels in exhaust gases. Often manufactured by Continental or Bosch for John Deere.

  • Nitrogen Oxide (NOx) Sensor / Chemical Sensor

    RE553441

    Measures NOx levels in exhaust gases. Often manufactured by Continental or Bosch for John Deere.

  • Nitrogen Oxide (NOx) Sensor / Chemical Sensor

    DZ112080

    Measures NOx levels in exhaust gases. Often manufactured by Continental or Bosch for John Deere.

  • Nitrogen Oxide (NOx) Sensor / Chemical Sensor

    RE575063

    Measures NOx levels in exhaust gases. Often manufactured by Continental or Bosch for John Deere.

  • DEF Dosing Unit Pump

    DZ121770

    Pumps DEF fluid into the exhaust stream. Available in 12V and 24V configurations depending on the machine.

  • DEF Dosing Unit Pump

    DZ121774

    Pumps DEF fluid into the exhaust stream. Available in 12V and 24V configurations depending on the machine.

  • DEF Dosing Unit Pump

    DZ121771

    Pumps DEF fluid into the exhaust stream. Available in 12V and 24V configurations depending on the machine.

  • DEF Dosing Unit Pump

    DZ111284

    Pumps DEF fluid into the exhaust stream. Available in 12V and 24V configurations depending on the machine.

  • DEF Dosing Unit Pump

    DZ128067

    Pumps DEF fluid into the exhaust stream. Available in 12V and 24V configurations depending on the machine.

  • DEF Dosing Unit Pump

    DZ121773

    Pumps DEF fluid into the exhaust stream. Available in 12V and 24V configurations depending on the machine.

  • Diesel Exhaust Fluid (DEF)

    Standard API-certified DEF fluid.

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