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Diesel Decoder

Any one of a thousand fault codes can stop a truck. This tool can keep it going.

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Dorman Diesel Decoder powered by Diesel Laptops®

Designed for heavy duty truck owner-operators and small commercial fleets, the Diesel Decoder is a powerful one-of-a-kind diagnostic tool for all heavy-duty truck makes.

Just plug it into a diagnostic port, sync it via Bluetooth® to the free Diesel Decoder by Diesel Laptops® app, and use your smartphone to view fault codes and get repair information. No expensive code-scanning hardware and software needed!

Pays for itself in one saved tow or dealer diagnostic visit


Turn Your Smartphone Into a Heavy Duty Diagnostic Tool

See how the Diesel Decoder can help you make the most of every mile

  Read DTCs and Access Instant Repair Help

Detects all true fault codes and provides instant access to the Diesel Laptops® repair library.

 Vin Information

Detects and stores comprehensive truck specifications.

 Total Vehicle Data

Use trip distance, engine operating hours and more to plan maintenance intervals.

 Driver Productivity and Trip Reports

View instant and average fuel economy, hard breaking events and more, and generate trip reports that can be viewed, printed and shared.

Get The Free Diesel Decoder App Today!

Now avaiable for download.


We Cracked the Code for Owner-Operators and Small Fleets

Your rig has thrown a fault code. Do you call for repair help? Or keep driving? The Dorman Diesel Decoder removes the mystery to help you decide to simply clear the codes and keep rolling, or if and when a repair is needed. Maximize your heavy-duty truck uptime by quickly and reliably detecting all true diagnostic trouble codes and manufacturer-specific fault codes.


Diesel Decoder Works on All Makes and Models

This powerful and affordable tool plugs into any HD truck diagnostic port to deliver real-time data for all major heavy-duty truck makes in North America, including Freightliner, Peterbilt, Mack, Kenworth, Vovlo, Western Star, International and many others.

Includes diagnostic port adaptor for Volvo and Mack.

Heavy-Duty Diagnostic Power, Minus the Heavy-Duty Price.

Turn your smartphone into a user-friendly HD diagnostic tool. Just download and sync via Bluetooth the free Diesel Decoder smartphone app to view a wide range of vital diagnostic and trip data - at a fraction of the cost of other diagnostic tools. New features and upgrades are delivered directly to the app, eleminating the need for cumbersome update procedures and the cost of replacing expensive diagnostic gear.


Instant Repair Help, Anywhere, Anytime

For owner-operators and managers of commercial fleets, truck maintenance and repair costs are a fact of life. Diesel Decoder can help manage the costs more efficiently. Using the free app, you can seamlessly connect to the Diesel Laptops® comprehensive Diesel Repair Platfrom digital library to diagnose fault codes and explore your repair and maintenance options.