Suzuki Fault Code

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Code 31 / P0105

Rough Low Idle / Stalling When Shifting

System

Air Induction

Symptom

Rough Low Idle / Stalling When Shifting

Diagnosis & fix steps

LOGIC: Manifold Absolute Pressure (MAP) Sensor Circuit Error. ACTION: Inspect small rubber vacuum line running between intake plenum and firewall-mounted MAP sensor. Clear oil sludge from sensor vacuum port; verify 5V reference and ~1.2–1.8V output at warm idle.

Red Seal field insights

PCV Oil Pooling: Blow-by oil mists back up into the tiny vacuum reference hose, swelling the rubber and clogging the sensing orifice on the remote-mounted Denso MAP sensor.

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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