LGMG Fault Code

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SPN 157 FMI 04

Engine Limp / Severe Lack of Rimpull

System

Fuel / HPCR

Symptom

Engine Limp / Severe Lack of Rimpull

Diagnosis & fix steps

LOGIC: Common Rail Pressure Sensor Circuit Voltage Low (Short to Ground). ACTION: Disconnect the common rail pressure sensor on the fuel rail. Verify 5V reference supply and ground return from the EDC17 ECU. Check signal line resistance to ground (must be infinite Ω); inspect engine harness running near the fuel filter head bracket for rub-through.

Red Seal field insights

Vibration Grounding: Industrial six-cylinder diesels run severe torsional vibration; bare split-loom rubs through the rail pressure signal wire against the raw casting of the intake manifold.

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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