Truck Fault Codes

Diagnostic fault codes, or DTCs, are the codes your commercial truck or diagnostic tool displays when your vehicle has an issue. Diesel Repair contains a library of all known diagnostic fault codes for commercial trucks from when electronic control modules (ECMs) were first introduced all the way up to current year and models. Our system contains both the OEM and the generic fault codes, so no matter how you retrieve those codes from your vehicle you are easily able to find repair information.


Endless Data just for you

For free users of Diesel Repair, you will be able to search and view the entire database. We’ll give you descriptions of each truck fault code, along with “quick repair” information that will summarize possible failed components that could cause the fault code to appear.

For paid users, you will also receive the added benefit of view the detailed step-by-step repair information for each fault code. These guides have been developed by the subject matter experts at Diesel Laptops, and you’ll find that the information, look, and feel is consistent across all manufacturers.

Easy Search Database

Users can enter any search query, partial or full. This ensures they can easily find what they are looking for in our database


Created by Experts

Every code has been summarized by our subject matter experts to give you a list of possible repairs to fix your truck fault code


Repairs Made Simple

Users on the Diesel Repair Standard or Pro plan can download step-by-step PDFs that contain color coded yes/no troubleshooting trees to guide them through the diagnostic procedure


Fault Codes Coverage

Our Experts have created Fault Code Coverage for Engine Manufacturers, Transmissions, Anti-lock Brake Systems, and more, including:

You can also use our VIN Decoder tool to quickly and easily figure out which modules you need to be viewing.



Chevrolet Duramax


Detroit Diesel

Ford PowerStroke

GMC Duramax


International Engines

Isuzu Engines

Mercedes-Benz Engines

Mack Engines

Mitsubishi FUSO

PACCAR engines

RAM Cummins

Sprinter Engine

Volvo Engines





HINO tranmission

Mack mDrive


Mitsubishi FUSO transmission

Volvo iShift

Bendix ABS- Hydraulic

Bendix ABS- Air


Mitsubishi FUSO ABS



Frieghtliner Cab & Chasis Controllers

Frieghliner Custom Chasis Corportation  Body Controllers


Hino Cab Controllers

International Cab & Chasis Controllers

Kenworth Cab & Chasis Controllers

Mitsubishi FUSO Cab & Chasis Controllers

Peterbilt Cab & Chasis Controllers

RAM Cab & Chasis Controllers

Thomas Built Buses

Volvo Truck Cab & Chasis Controllers

WABCO OnGuard & OnLane ADAS Systems

Western Star Cab & Chassis Controllers

Access Truck Fault Codes and so much more today!

Diesel Repair is a freemium model, which means you can signup for an account today without entering any payment information and start being more efficient at repairing commercial trucks

Copyright © 2020- Diesel Repair by Diesel Laptops.