If you're working on Cummins-powered trucks, having the right diagnostic tool can save hours of guesswork and downtime. As of 2025, the best scanner for Cummins engines is one that reads live data, performs forced regens, clears codes, and can access both engine and aftertreatment modules.
Top Pick: A diesel laptop preloaded with Diesel Tech or Universal Diag paired with a Nexiq 3 adapter. This combo supports all Cummins ISX, ISB, ISC, and newer X-series engines.
Why it stands out:
-
Performs forced regens on command
-
Reads SPN/FMI and manufacturer-specific codes
-
Covers 2003–2026 Cummins models
-
Works with DEF/DPF systems and SCR control modules
Pro Tip: Avoid handheld tools that advertise “Cummins support” but only show generic OBD2 codes. True Cummins diagnostics require J1939 and J1708 protocol access.