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Cummins Engines · 452
Injector Metering Rail 1 Pressure Sensor Circuit Low
What this code means
Injector Metering Rail 1 Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
Applies to: all electronic engines.
Possible causes / checks (from the source)
SPN 157, FMI 4; Lamp: Amber
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Ask for the replacement part on WhatsAppSource: Cummins Engine Fault Code List (Scribd). Single published source — confirm against the manual for your exact model before ordering parts. Compiled 2026-10-30. No manufacturer affiliation.