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Cummins Engines · 238
Sensor Supply 3 Circuit Low
What this code means
Sensor Supply 3 Circuit - Voltage Below Normal or Shorted to Low Source
Applies to: ISX CM871 (2007-2010).
Possible causes / checks (from the source)
SPN 3511, FMI 4; Lamp: Amber (per Cummins SM2202 service bulletin table, oemdtc.com)
Need the part?
If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (238), machine model and serial number — we quote genuine and OEM replacement parts for export.
Ask for the replacement part on WhatsAppSource: Diesel Service Parts — Cummins ISX CM871 fault code list; cross-checked vs Cummins SM2202 service bulletin (oemdtc.com). Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.