Home › Cummins Engines › 233
Cummins Engines · 233
Coolant Pressure Below Normal Range
What this code means
Coolant Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
Applies to: ISX CM871 (2007-2010).
Possible causes / checks (from the source)
SPN 109, FMI 18; Lamp: Amber
Need the part?
If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (233), 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 Engine Fault Code List (Scribd). Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.