Cummins Fault Code
Free · no signupSPN 3509 FMI 3
Multiple Sensor Errors
System
Sensors
Symptom
Multiple Sensor Errors
Diagnosis & fix steps
LOGIC: Sensor Supply Voltage 1 - Voltage Above Normal.
ACTION: Check for a short between the 5V reference wire and the 12V/24V power wire in the harness.
Red Seal field insights
Specs: Sensor supply must be 5.0V (+/- 0.2V).
RED SEAL FIX: Unplug sensors one by one to see which one "un-shorts" the 5V rail.
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