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Cummins Engines · 442
Battery 1 Voltage High

What this code means

Battery 1 Voltage - Data Valid But Above Normal Operating Range - Moderately Severe Level

Applies to: ISX CM871 (2007-2010).

Possible causes / checks (from the source)

SPN 168, FMI 16; Lamp: Amber

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (442), 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.