Detroit Diesel Fault Code
Free · no signupSPN 1077 FMI 14
No-Start / Sudden Engine Stall
System
Fuel System
Symptom
No-Start / Sudden Engine Stall
Diagnosis & fix steps
LOGIC: High Pressure Fuel System Internal/External Leakage (Leak Down Test).
ACTION: Connect HP fuel rail cap kit to isolate individual injectors. Perform high-pressure leak-down test to identify leaking injector needle.
Red Seal field insights
Pressure Loss: High pressure drops faster than calibrated threshold during engine shutoff or cranking, cutting injection enablement.
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