Dealer-Level Software
Access OEM software from leading brands including Cummins, Detroit Diesel, CAT, Volvo, Mack, Allison and more.
View Software →Professional diesel diagnostics
Dealer-Level Diagnostic Tools for Heavy-Duty Trucks
Complete diagnostic solutions with OEM software, rugged hardware, adapters, cables, and expert support — trusted by shops and fleets nationwide.
TEXA
Jaltest
AUTEL
JPRO
NEXIQ
Cummins
+ More
Limited Time Offer
0% APR Financing
On qualifying orders over $1,500
Featured Kit:
Complete Fleet Diagnostic Kit
Everything you need to diagnose engine, transmission, ABS & more.
Only
$3,495
Reg. $4,295
Mixed Fleet Coverage
One solution for light, medium, and heavy-duty trucks. Support for virtually every make and model.
Explore Coverage →
Expert Technical Support
U.S.-based support from technicians who understand heavy-duty systems inside and out.
Get Support →Trusted by shops, fleets, and diesel technicians
Thousands of diesel professionals rely on HDT for the right diagnostic tools and support.
See Why Shops Trust HDT
Diesel TechMidwest Fleet★★★★★
Shop OwnerTexas★★★★★
Fleet ManagerCalifornia★★★★★
Fast ShippingOrders ship same day
0% APR FinancingOn qualifying orders
OEM SolutionsAuthorized software & tools
Ready-to-Run KitsPreconfigured and tested
Expert Phone SupportU.S.-based technicians
Shop diagnostic solutions
The tools serious shops rely on.
Rugged hardware, powerful software, and the support you need to keep trucks moving.
Shop Diagnostic Kits
Engine Diagnostics
Read/clear codes, live data, actuations, and performance analysis.
DPF & Emissions Service
Forced regens, emissions tests, and aftertreatment diagnostics.
ABS & Transmission
Diagnose braking, shifting, and drivetrain issues.
All-Makes Coverage
Support for Class 3–8 trucks from major manufacturers.
OEM Software Access
Authorized access to software and calibration databases.
For years, we’ve helped repair shops and fleets choose the right diagnostic solution.
HDT is your partner for tools, training, and ongoing support — so you can fix more, faster.
Learn About HDT
Connect with the right tool faster
Heavy Duty Truck Diagnostics fits every shop
Find the Right Tool
Expert help matching your trucks and workflow.
After-Purchase Support
Setup help, training, and software guidance.
Ready-to-Run Options
Preconfigured laptops and complete kits.
Compatibility Help
Check coverage before you buy.
Engine Diagnostics
DPF & Emissions
Transmission Service
Mixed Fleet KitsShop by category
Shop Diagnostic Solutions
Diesel Laptop Diagnostic Kits
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OEM Diagnostic Software
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Adapters & Cables
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Universal Truck Diagnostic Tools
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Shop by Brand
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Shop by Vehicle/System
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Popular packages
Featured Products
Jaltest Dealer Level Truck Diagnostic Kit
All-makes commercial diagnostics
$7,485.00 Free Shipping Add to Cart
TEXA Axone Nemo Plus Diagnostic Tablet
Multi-brand heavy duty diagnostics
$4,295.00 Free Shipping Add to Cart
Why Buy From Heavy Duty Truck Diagnostics?
We Help You Choose
We match the right tool to your shop and workflow.
OEM & Dealer Level
We offer the industry’s leading OEM and dealer solutions.
Setup & Support
We configure, test, and help you get up and running.
Diesel Experts
We live and breathe heavy-duty diagnostics.
Shops & Fleets Trust Us
We support technicians across the USA.
Shop by manufacturer
Shop by Top Brands
Dealer-Level Capabilities You Can Count On
*Capabilities vary by tool, vehicle, software subscription, manufacturer licensing, and vehicle configuration.
Not sure which diagnostic tool your shop needs?
Our team can help you compare options and choose the right setup for your vehicles, systems, and workflow.
Real shop feedback
Trusted by shops just like yours
“Helped us find the right setup for our mixed fleet. Their support is second to none.”
— Kevin M., Diesel Tech“Fast shipping, great pricing, and the kit was ready to go right out of the box.”
— Jason T., Fleet Manager“They know their stuff. Got us dealer-level capability without the hassle.”
— Mike R., Shop Owner“Excellent support after the sale. They’re always just a phone call away.”
— Brian K., Service ManagerLearn before you buy
Diesel Diagnostics Resources
How to Choose the Right Heavy-Duty Scan Tool
Match the tool to the engines actually rolling into your bay.
Read Article →
OEM vs Aftermarket Diagnostic Software
INSITE, DiagnosticLink, JPRO, Jaltest — what each one really does.
Read Article →
What You Need for DPF Regens
Tools, procedures, blockers, and what works on every major OEM.
Read Article →
Best Diagnostic Tools for Mixed Fleets
One platform for the bay you actually run — honest brand fit.
Read Article →
Laptop Kit vs Software Only
Bundled kit or license-only? Tech depth changes the math.
Read Article →Common Questions
What tools and software do you support?
We support a wide range of professional diagnostic tools, OEM software, adapters, and laptop kits. Exact support depends on the product and licensing.
Are your diagnostic kits ready to use out of the box?
Many kits can be configured, tested, and prepared before shipping. Check the product page or call us for details.
Do you offer financing on diagnostic equipment?
Financing options may be available for qualifying orders. See the financing page for details.
Do you provide training or setup assistance?
Yes. Our team can help with product selection, setup guidance, and support after purchase.
What is your return policy?
Return and software licensing policies vary by product. Review the policy page before purchase.
Start building your ideal diagnostic setup
Shop kits, warranty support, and shipping options designed for professional repair shops.
Shop KitsWarranty / SupportFast Shipping