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Cummins ISX Fault Codes Reference (Top 20) | HDT
Cummins ISX and X15 share most of their fault code architecture. The codes below are the 20 we see most often across…
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 — Honest 2026 Comparison | HDT
JPRO and Jaltest are the two strongest aftermarket multi-brand diagnostic platforms in 2026 North American HD service. Most shops can only afford…
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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…
Resource
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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