Komatsu Fault Code

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AA10NX

Engine Derate (E11); Air filter light.

System

Intake

Symptom

Engine Derate (E11); Air filter light.

Diagnosis & fix steps

Air Cleaner Clogging. LOGIC: Intake vacuum switch triggered by restriction. ACTION: Inspect filters. FIX: Replace both Air Filters.

Red Seal field insights

Never blow out filters with air in dusty regions. It enlarges the pores and leads to "dusting" (engine failure).

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.

Book an uptime review

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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