Cummins Fault Code

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Cummins 117 (SPN 156 FMI 4)

Engine stalling; Hard start; Severe power derate; Possible white smoke.

System

Not specified

Symptom

Engine stalling; Hard start; Severe power derate; Possible white smoke.

Diagnosis & fix steps

Rail Pressure Voltage Low. LOGIC: Signal < 0.5V (Short to Ground). ACTION: Unplug sensor; if code becomes 118, sensor is dead. Check 5V ref on Pin A. FIX: Replace Rail Pressure Sensor or repair harness short.

Red Seal field insights

Safety Warning: The fuel rail can hold over 20,000 PSI even with the engine off. Never crack a fuel line while this code is active until you've verified actual pressure is low.

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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