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Cummins Engines · 132
Accelerator Pedal Position Sensor 1 Circuit Low
What this code means
Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
Applies to: ISX CM871 (2007-2010).
Possible causes / checks (from the source)
SPN 91, FMI 4; Lamp: Red
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Ask for the replacement part on WhatsAppSource: 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.