What does Cummins fault code 1117 (SPN 627 FMI 2) mean?

Q: What does Cummins fault code 1117 (SPN 627 FMI 2) mean?

1117 (SPN 627 FMI 2) indicates: Engine won't start; Sudden power loss while driving; Scanner drops connection. Fix: Power Supply Lost with Ignition On. LOGIC: The ECM detected a loss of battery power while the "Key Switch" was still in the ON position. ACTION: 1. Check main 30A fuses at the battery. 2. Check the ECM power relay. 3. Inspect main battery ground at the frame. FIX: Tighten battery terminals; replace corroded fuses; replace ECM Power Relay.

Cummins Fault Code

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1117 (SPN 627 FMI 2)

Engine won't start; Sudden power loss while driving; Scanner drops connection.

System

Not specified

Symptom

Engine won't start; Sudden power loss while driving; Scanner drops connection.

Diagnosis & fix steps

Power Supply Lost with Ignition On. LOGIC: The ECM detected a loss of battery power while the "Key Switch" was still in the ON position. ACTION: 1. Check main 30A fuses at the battery. 2. Check the ECM power relay. 3. Inspect main battery ground at the frame. FIX: Tighten battery terminals; replace corroded fuses; replace ECM Power Relay.

Red Seal field insights

This is often caused by a "jiggling" fuse or a loose ground. If the code is intermittent, check the "Clean Machine Ground" wire that goes directly to the battery negative post.

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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