Cummins Fault Code 284 — Engine Speed/Position Sensor Supply Circuit Low

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Cummins Engines · 284

Engine Speed/Position Sensor Supply Circuit Low

What this code means

Engine Speed/Position Sensor (Crankshaft) Supply Voltage Circuit - Voltage Below Normal, or Shorted to Low Source

Applies to: ISX CM871 (2007-2010).

Possible causes / checks (from the source)

SPN 1043, FMI 4; Lamp: Amber

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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.