John Deere 005246.31 – ECU: Engine Derate Countdown Activated

The Engine Control Unit (ECU) has initiated an engine derate countdown (Aftertreatment SCR Operator Inducement Fault) as a precautionary measure to protect the engine and aftertreatment system from damage and ensure emissions compliance. This is an informational code indicating that another active fault within the Selective Catalytic Reduction (SCR) or Diesel Exhaust Fluid (DEF) system has triggered the derate. DPF regeneration is inhibited while this code is active.

• 5100M
• 4045 PowerTech
• 8370R
• S670

1. 1

   Retrieve all active and stored fault codes using a diagnostic scanner to identify the primary fault (e.g., 1569.31, 3516.07, 2659)

2. 2

   Check DEF quality (should be clear with slight ammonia smell) and level. Drain and refill if cloudy, discolored, or strong-smelling

3. 3

   Inspect for white crystal deposits around the DEF tank cap and injector, indicating poor quality DEF or a leak

4. 4

   Thoroughly inspect all wiring harnesses, connectors, fuses, and relays associated with the aftertreatment system for damage, corrosion, or loose connections

5. 5

   If an EGR-related code (like 2659) is present, inspect the EGR valve and cooler for soot buildup or blockages

1. 1

   Address the primary fault code

   Follow specific diagnostic and repair procedures for the active DTCs found. For DEF faults (e.g., 3516.07), replace the DEF header. For EGR faults (e.g., 2659), clean the EGR valve and cooler, or replace if cleaning is ineffective or the valve is faulty. For fuel faults, inspect and replace fuel filters, check for blockages in fuel lines, and verify the fuel pump and pressure regulators are functioning correctly. For DPF faults, perform a forced regeneration or have the DPF professionally cleaned or replaced if clogged with ash.

2. 2

   Clear fault codes

   After completing repairs for the primary fault, use a diagnostic scanner to clear all fault codes. Code 005246.31 will clear on its own once the underlying issue is resolved.

3. 3

   Perform system reset/relearn

   Use a diagnostic tool like John Deere Service Advisor to perform a system reset or relearn procedure if components like a DEF header or VGT actuator were replaced.

4. 4

   Verify the repair

   Operate the machine to ensure that the fault codes do not reappear and that the engine is no longer in a derated state.