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Cummins Engines · 686
Turbocharger 1 Speed Erratic
What this code means
Turbocharger 1 Speed - Data Erratic, Intermittent, or Incorrect
Applies to: ISX CM871 (2007-2010).
Possible causes / checks (from the source)
SPN 103, FMI 2 (SPN 103 = Turbocharger 1 Speed per Cummins list; FMI 2 per source description text)
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Ask for the replacement part on WhatsAppSource: Diesel Service Parts — Cummins ISX CM871 fault code list. Single published source — confirm against the manual for your exact model before ordering parts. Compiled 2026-10-30. No manufacturer affiliation.