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Cummins Engines · 559
Injector Metering Rail 1 Pressure Low

What this code means

Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level (low rail pressure)

Applies to: all electronic engines.

Possible causes / checks (from the source)

SPN 157, FMI 18; Lamp: Amber

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (559), machine model and serial number — we quote genuine and OEM replacement parts for export.

Source: 30-Minute DPF Clean — Cummins fault code list; cross-checked vs Cummins Engine Fault Code List (Scribd). Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.