Sinotruk Fault Code

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P0238 / SPN 102 FMI 3

Black Smoke / Engine Limp Mode

System

Air Induction

Symptom

Black Smoke / Engine Limp Mode

Diagnosis & fix steps

LOGIC: Manifold Absolute Pressure (MAP) Sensor Signal Voltage High. ACTION: Disconnect combined MAP/MAT sensor on intake manifold. Check sensor ground circuit; measure 5V reference. Clean heavy soot and blow-by oil cake clogging the sensing diaphragm port.

Red Seal field insights

EGR & Oil Coking: Heavy crankcase vapor and exhaust soot blend into a sticky paste across the manifold sensing port, isolating the piezoresistive element from actual boost pressure.

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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