Cummins Fault Code 784 — Adaptive Cruise Control Mode Erratic

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Cummins Engines · 784

Adaptive Cruise Control Mode Erratic

What this code means

Adaptive Cruise Control Mode - Data Erratic, Intermittent, or Incorrect

Applies to: ISX CM871 (2007-2010).

Possible causes / checks (from the source)

SPN 1590, FMI 2; Lamp: None

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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.