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Cummins Engines · 293
Auxiliary Temperature Sensor Input 1 Circuit High
What this code means
Auxiliary Temperature Sensor Input 1 Circuit - Voltage Above Normal, or Shorted to High Source
Applies to: ISX CM871 (2007-2010).
Possible causes / checks (from the source)
SPN 441, FMI 3; Lamp: Amber
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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.