Hitachi Fault Code

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10042-12 (SPN 5246 FMI 12)

Red "Stop Engine" lamp; Immediate or timed engine derate; 5 MPH/Low Idle lock.

System

Not specified

Symptom

Red "Stop Engine" lamp; Immediate or timed engine derate; 5 MPH/Low Idle lock.

Diagnosis & fix steps

SCR Operator Inducement - Internal Component Failure. LOGIC: This is a "Critical Inducement." The machine's DCU (Dosing Control Unit) or the Engine ECM has detected a severe internal error or a long-standing emissions violation that has timed out. ACTION: 1. Use MPDr. (Hitachi Service Tool) to check for "Root" codes like NOx sensor or DEF Pump failures. 2. Check the DCU main power relay. 3. Inspect the communication (CAN) link between the engine and the SCR controller. FIX: Address the underlying SCR hardware failure (Pump, Doser, or Sensor); perform an "Inducement Reset" using the service tool to unlock the machine.

Red Seal field insights

On Hitachi machines, this code often "latches." Even if you fix the broken wire or bad sensor, the 10042-12 code will stay active until a technician performs a manual "Emissions Trip Reset" in the software. You cannot clear this by simply disconnecting the battery.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

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Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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