Kubota Fault Code

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E:042

Loss of Power / Heavy Black Smoke Under Load

System

Engine / Air

Symptom

Loss of Power / Heavy Black Smoke Under Load

Diagnosis & fix steps

LOGIC: Intake Air Restriction Pressure Switch Circuit Closed. ACTION: Remove air filter outer element; blow out dust or replace plugged cartridge. If filter is clean, inspect mechanical vacuum switch on air cleaner housing and test switch continuity under manual vacuum pump.

Red Seal field insights

Diaphragm Rupture: A torn vacuum sensing diaphragm grounds the warning circuit prematurely, tricking the machine controller into signaling a clogged intake filter.

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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