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Written by the technicians who answer our support line — the same answers, published.
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Fault Codes
What Is SPN FMI? Truck Fault Codes in Plain Language
Every code is two numbers: what broke and how. Learn to read them without a manual.
View details →Fault Codes
DPF Regen Not Working? The 7 Real Causes
Why forced regens actually fail — ranked by what we find in the shop.
View details →Fault Codes
DEF Derate & the 5 MPH Lockout: What to Do Right Now
The inducement sequence decoded, with the correct recovery order per platform.
View details →Industry
Gray-Market Diagnostic Software: What Actually Goes Wrong
Cracked software failure modes from the recovery cases we handle.
View details →Emerging Tech
Electric Truck Diagnostics: A Primer for Diesel Shops
What carries over, what's new, and when to buy in.
View details →Basics
Is There OBD2 on a Semi Truck? (No — Here's What Instead)
The most-googled question in truck diagnostics, answered properly.
View details →Buying
Bluetooth Scanner vs Laptop Kit: Which Setup Wins?
Honest trade-offs from people who use both daily.
View details →Maintenance
The Aftertreatment Maintenance Schedule That Prevents Derates
Mileage-based, per-component, printable — the schedule we hand fleets.
View details →Business
Starting a Mobile Diesel Repair Business: The Tool Reality
What successful operators started with, and what waited.
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