Cummins Fault Code
Free · no signup1117 (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.
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