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Cummins ISX Fault Codes: Lookup and Diagnostic Tools
To look up a Cummins ISX fault, record the engine serial number, ECM code, Cummins fault number and complete SPN/FMI when available,…
Senior tech walkthroughs
Diesel diagnostics, written by techs.
Buying guides, deep dives on regens and ash resets, OEM-vs-aftermarket reality checks. Every article is written for working diesel techs and shop owners.
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Authorized Reseller vs Gray Market HD Software | HDT
Search “Cummins INSITE” on eBay, AliExpress, or any of the lesser-known forums and you’ll find listings at $49, $99, $200 that look…
Resource
Mixed Fleet Diagnostic Tools | Class 3-8 All-Makes | HDT
If you wrench on Cummins on Monday, Detroit on Tuesday, PACCAR Wednesday, and a Volvo or Mack by Thursday afternoon, you don’t…
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JPRO vs Jaltest: Compare Coverage, Kits and Licensing
Compare exact vehicles, service functions, included hardware and license scope. Current JPRO coverage includes off-highway applications.
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How to Diagnose Cummins Fault Codes — Tech Workflow | HDT
A fault code is a starting point, not a diagnosis. Cummins ECMs throw codes for symptoms, not root causes — a single…
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Heavy Duty Scan Tool Comparison 2026 | HDT
No single scan tool covers Class 3-8 across every OEM at dealer-level depth. That tool doesn’t exist in 2026 and hasn’t for…
Diagnostic Kits
Laptop Kit vs Software Only: Which Diagnostic Setup Should Your Shop Buy?
A bundled kit is a markup, but it is also a guarantee that the laptop, OS, drivers, adapter, and license were tested…
Fleet Diagnostics
Best Diagnostic Tools for Mixed Fleets
Independent shops solve mixed-fleet coverage with one solid multi-brand platform plus one or two OEM titles for the brands they see most.…
DPF & Emissions
What You Need for DPF Regens: Tools, Procedures, and What Actually Works
A forced regen burns soot. It does not remove ash. A reliable setup needs the right interface, live aftertreatment data, the ability…
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