Diesel Laptops is excited to bring you the TruckFaultCode iOS app which gives you access to over 40,000 diagnostic trouble codes found on commercial trucks. This app allows you to search by manufacturer, model, and code number. Each diagnostic code will give you as much information as possible on the components related to that diagnostic code, along with a list of probable causes so that you can isolate and repair your vehicle. This is the only app you will find that is dedicated towards the commercial trucks industry, and is the most complete library you will find.

For commercial truck diesel engines, every single major manufacturer is covered. This includes CAT, Cummins, Detroit, Mack, Volvo, International, HINO, Isuzu, MBE, PACCAR, Ford, Sprinter, GM, and many more.

All electronic transmissions that are used in the commercial truck industry are also included. The list includes Allison, Detroit, Eaton, Volvo IShift, and Mack mDrive.

We've also included repair information for all known cab controllers (Such as Freightliner, International, Kenworth, Peterbilt, Mack, and Volvo), ABS systems (Wabco, Bendix), and other sub systems as well.

What’s New

Version 2.6

Fix minor issue.

Ratings and Reviews

4.0 out of 5
23 Ratings

23 Ratings

C-rod 5 ,

Great App!!!

Great App!

DzlTechy ,

Want my life story?

May as well have asked for my social with the amount of info I had to include to just use the app. Go through the process of finding the definition for a fault and then have to subscribe to get any more info, I think I’ll have to just stick with google next time.

Samsutton ,

Worthless on new trucks

This is 2019. The app only goes to 2013. I think you need to update your app. I’ll be requesting a full refund.


TR Systems LLC
17.5 MB

Requires iOS 11.2 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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