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Cummins Engines · 123
Intake Manifold 1 Pressure Sensor Circuit Low

What this code means

Intake Manifold 1 Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source

Applies to: ISX CM871 (2007-2010).

Possible causes / checks (from the source)

SPN 102, FMI 4; Lamp: Amber

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (123), machine model and serial number — we quote genuine and OEM replacement parts for export.

Source: Diesel Service Parts — Cummins ISX CM871 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.