Cummins Fault Code

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Cummins 116 (156-3)

Limp Mode / Low Rail Pressure.

System

Fuel System

Symptom

Limp Mode / Low Rail Pressure.

Diagnosis & fix steps

LOGIC: Fuel Timing Rail Pressure - Voltage Above Normal (Open). ACTION: Unplug the Rail Pressure Sensor. Check for 5V reference and a solid ground.

Red Seal field insights

Specs: 0.5V at 0 PSI; 4.5V at Max Pressure. PRO-TIP: FMI 3 usually means a broken wire or a "blown" sensor internal circuit. If you have 5V and ground but the signal pin is at 5V constantly, the sensor is internally open.

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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