Used Diesel Decoder

Used Diesel Decoder

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Please Note: This item is used and is in good condition.

Pays for itself in one saved tow or dealer diagnostic visit!

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!


Turn Your Smartphone Into a Heavy Duty Diagnostic Tool

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

Diesel Decoder Application

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.

Diesel Decoder Application

Total Vehicle Data

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

Driver Productivity and Trip Reports

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

Get The Free Diesel Decoder App Today!

Now available for download

Maximize Uptime

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, Volvo, Western Star, International and many others.

All Makes and Models

Your rig has thrown a fault code. Do you call for repair help? Or keep driving? The 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.

High Power, Low 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

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.

Frequently Asked Questions

See what questions other customers are asking.

See FAQs

Is this device Apple MFI Certified?
No, it is not. This is an optional certification program for Apple that lets you integrate with certain Apple platforms and services such as CarPlay, Find My, AirPlay, HomeKit, and others. Our device uses standard Bluetooth technology, which is exempt from the Apple MFI program.

30 Day Money Back Guarantee

30-Day Money Back Guarantee

At Diesel Laptops we ensure your satisfaction with a 30-Day Money Back Guarantee on this product, giving you confidence in your purchase.

For detailed information on our guarantee, please visit our Return Policy page below.

View Return Policy

Contact Us


If you have any questions about this or any other product, please don't hesitate to contact one of our Diesel Laptops experts at (888) 983-1975 or by clicking below!

Contact Us

Customer Reviews

Based on 1 review
Doug Laney
Helped in 2 different ways!

- I am able to clear inactive / ghost codes easily

- Decoder highlighted a fuel pressure permanent code that required repair. (Driver dashboard in my truck showed no warning lights and no active codes.) Took to shop. They found & repaired the issue before it eventually became a major problem.

We always hear the buzz word "investment." In this case, it indeed is.