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Cummins Engines · 235
Coolant Level Critically Low

What this code means

Coolant Level - Data Valid But Below Normal Operating Range - Most Severe Level (engine protection)

Applies to: ISX CM871 (2007-2010).

Possible causes / checks (from the source)

SPN 111, FMI 1; Lamp: Red

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (235), machine model and serial number — we quote genuine and OEM replacement parts for export.

Source: 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.