# OTR Diagnostics — Heavy-duty scan tool made easy

> Heavy-duty truck diagnostic and repair tool with AI fault code analysis and bi-directional commands. (iPhone/iPad app by OTR Performance.)

- Source: https://appshunter.io/ios/app/otr-diagnostics/id1508165885 (this page in markdown: same URL + `.md`)
- Developer: [OTR Performance](https://appshunter.io/developer/1508165884)
- Category: Utilities
- Price: Free
- Rating: 4.00/5 from 98 App Store ratings · 58 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 262 MB
- Languages: American English
- Released: 2020-07-10
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews.md

## What is OTR Diagnostics?

OTR Diagnostics — Trusted by 10,000+ Truck Owners

Dealing with regen problems, nonstop alerts, fault codes, and unexpected derates on your heavy duty truck? You are not alone. More than 10,000 truck owners and fleets trust OTR Diagnostics to take control, cut downtime, and avoid expensive dealer visits.

Powered by OTR Assist + OTR LINK 2

This is more than a scan tool. OTR Assist is your AI partner, breaking down fault codes in plain language and helping you troubleshoot and decide if you can keep driving or need service now. Paired with OTR LINK 2, our proprietary Bluetooth adapter, you get faster connection speeds, more accurate fault code data, and more live data parameters than ever before. It is 5X better than previous hardware. Ask us how to get a FREE upgrade today.

Commands That Keep You Moving

With bi-directional commands built right into OTR Diagnostics, you are no longer stuck waiting on a shop to do what you can handle yourself.

Reset active and inactive fault codes

Reset the entire aftertreatment system

Reset derates that slow you down

Reset soot levels after a DPF service

Run forced DPF or SCR regens right from the cab

These commands put you back in control, saving you time, money, and downtime.

Fault Code Insights

Go beyond a flashing dash light. OTR Diagnostics helps you understand fault codes with the same level of detail as dealer software, but in plain language you can actually use.

Decode your dash lights

Uncover the root causes of issues

Track how often a problem occurs

Know which repairs or parts are needed

Live Data Monitoring

Want to know if your regen is working? Want to monitor exhaust temps, soot levels, or DEF? OTR Diagnostics lets you see your truck’s vitals in real time so you can spot issues before they stop you.

Common live data parameters include:

DPF fluid level

DPF soot level

EGR valve position

Aftertreatment exhaust temps

Boost pressure

Accelerator pedal position

Engine fuel delivery pressure

Available live data may vary depending on the engine model your device is connected to.

Explore Your History

Recurring problems? OTR Diagnostics logs every fault code and command so you can see when issues happened, when they were cleared, and how long regens lasted.

Proven. Tested. Backed by Support

We run OTR Diagnostics, OTR Assist, and OTR LINK 2 on our own fleet of test trucks including late model Paccar MX engines to make sure everything works before it reaches you. That is why more than 10,000 drivers already trust OTR Diagnostics.

Made in Michigan. Built for You

We engineer, assemble, and ship right from our shop in Macomb, MI. If you are nearby, stop in and see us.

Coverage

We support a wide range of heavy duty engines:

Cummins: CM871, CM2150, CM2250, CM2350 (2008–2024)

Detroit Diesel: DD60, MBE, DD13, DD15, DD16 (2008–2024)

Paccar: MX11, MX13 (2011–2024), PX7, PX9 (2008–2024)

Volvo: D11, D13, D13TC, D16 (2014–2024)

Mack: MP7, MP8, MP8HE, MP10 (2014–2024)

For the full list of compatible models, call or text us at 586-799-4375.

Need Help or Have Questions?

Call or text us anytime at 586-799-4375 or email support@otrperformance.com.

## Key features

- AI-powered fault code explanation
- Bi-directional commands for repairs
- Reset active/inactive fault codes
- Run forced DPF/SCR regens
- Live data monitoring
- Fault code history tracking

## What do users think of OTR Diagnostics?

Overall sentiment: mixed

**Pros**

- 💰 Saves money on repairs
- 🛠️ Clears fault codes
- 🔄 Performs forced regens
- ✅ Works with various engines
- 👍 Easy to use
- 💡 Provides diagnostic insights
- 🚀 Gets trucks back on the road
- 🤝 Excellent customer support
- 💯 Useful for owner-operators
- 🌟 Saves time and money

**Cons**

- 💸 Overpriced
- 🐛 Buggy and unstable app
- 🔌 Frequent Bluetooth disconnects
- 📉 Updates cause problems
- ❌ Some features disappeared after updates
- 🤷‍♂️ AI assistant is inconsistent
- 🚫 Cannot clear certain codes
- ⏳ Subscription issues
- 📉 Forced regen not consistent
- 👎 Not working properly after updates

**Commonly reported bugs**

- App constantly disconnects from device
- Generic code option disappeared
- Forced regen is no longer consistent
- AI assistant not working
- App asks to do things not available in app
- Bluetooth connection rejects
- App doesn't work without data connection
- Forced regen not activating after updates
- Login authentication errors
- Cannot start regen process on newer models

**Most requested features**

- Remember email address for login
- Allow offline functionality without data connection
- Add option to change speed
- More detailed diagnostic information
- Allow basic subscription to work on multiple VINs

## Recent user reviews (10 of 58)

All indexed reviews: https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews.md

### 3/5 — Limited options

*2026-07-26*

I would like to recommend to the developer to add more options just like when you using the computer because am paying high subscription and sometimes still need to go shop for full scan from various components like transmission now its only focusing the def system and couple other areas not even the whole thing please update with more useful options.

### 3/5 — Not reliable

*2026-05-19*

I don’t recommend it to solve problems because you still have to go to see a mechanic and he uses his own tools. But you can delete old codes that doesn’t really help because they are already inactive.

### 2/5 — Too expensive

*2026-05-05, version 4.0.9*

There’s so many other truck diagnostic options nowadays on Amazon etc that the high price is no longer justified for this market. The Ai option is mediocre, it’s better to plug in those codes into other Ai models and often get a better explanation.

### 2/5 — Updates bring too many problems

*2026-03-31*

App constantly disconnects from device, can no longer clear generic codes ( like the whole command option disappeared), and forced regen is no longer consistent. Also when you are trying to find out about the codes you have the AI assistant will not work it’s very inconsistent. When it does work it asks you to do things so it can help further diagnose the issue but the things it asks you to do you don’t even have the option to in the app. 6.7 isb Cummins engine International truck. This app use to work but it seems like the update messed some things up and I don’t know if they are trying to fix it

### 1/5 — Not working properly

*2026-03-30, version 4.0.7*

Used to be great. But after updates it started working bad. First was a problem that there were only Cumins reset button and generic button disappear, and it happened in worst convenience possible, when i need to reset generic codes. Now there is generic code reset button but no Cumins reset button, especially when i need it. Starting to have a feeling that is not worth $600 per as it doesn’t work when you need it. Developers need to do something about asap, i am almost ready to give up on it.  Support just keep sending me new devices, but nothing helps. Sometimes it’s working, sometimes it doesn’t. I paid another year subscription and it’s not working as it should

### 5/5 — It works

*2026-03-24, version 4.0.7*

This is my 2nd year using otr diagnostics. It truly works good. I’m an owner operator of 3 truck . I have used this device for our Detroit and Paccar engines .

### 5/5 — OTR review

*2026-02-08, version 4.0.3*

Amazing tool, thankful.

### 2/5 — Basic code reader and overpriced

*2026-01-15, version 3.0.20*

Bought only becuase i read it can clear derates but it 100% does not. I rarely use it only to do force regen and read codes but you can do that with a $100 tool and no yearly subscription. Paid over $700 for this junk and regret it. The App also disconnects very often. Bad purchase.

### 1/5 — Can manage anything , won’t work and no customer support on weekends..

*2025-12-06, version 3.0.20*

All I get is that my subscription is not active, I paid 500dlls and this thing doesn’t work.. I bet this is just a scam until they reach their subscribers goal then their are going to disappear..

### 5/5 — latest update November 18, 2025

*2025-11-19*

The latest update is causing several codes to come up that the app will not clear. These codes were not there until the update this morning.

## Frequently asked questions about OTR Diagnostics

### What does OTR Diagnostics do?

OTR Diagnostics is a heavy-duty truck scan tool that helps owners and fleets diagnose and resolve issues like fault codes, regen problems, and unexpected derates. It provides plain-language explanations of fault codes, allows for bi-directional commands to fix common problems, and monitors live truck data in real-time.

### What are the key features of OTR Diagnostics?

Key features include AI-powered fault code insights that break down complex codes into understandable terms, bi-directional commands to reset fault codes, aftertreatment systems, derates, and soot levels, and the ability to run forced DPF or SCR regens directly from the cab. It also offers live data monitoring for critical engine parameters.

### How much does OTR Diagnostics cost?

The application itself is free to download. However, to utilize its full diagnostic capabilities, it requires a proprietary Bluetooth adapter called OTR LINK 2. The description mentions a potential FREE upgrade for the adapter, suggesting that the primary cost is associated with the hardware.

### What heavy-duty truck engines does OTR Diagnostics support?

OTR Diagnostics supports a wide range of heavy-duty engines from major manufacturers including Cummins, Detroit Diesel, Paccar, Volvo, and Mack. Specific engine models and year ranges are listed, covering engines from approximately 2008 to 2024.

### How can OTR Diagnostics help me avoid expensive dealer visits?

By providing detailed, plain-language explanations of fault codes and offering bi-directional commands to resolve common issues, the app empowers truck owners to troubleshoot and fix problems themselves. This can prevent minor issues from escalating and reduce the need for costly trips to a dealership for routine diagnostics and repairs.

## Version history (last 5 releases)

### 4.0.12 — 2026-08-22

Thank you for your continued support and for being part of the OTR community! We're committed to making your experience even better with each update.

Here’s what’s fresh off the diagnostics table:
  • Add additional support for cummins engines

We're changing the game when it comes to taking ownership of your vehicle

Enjoying OTR Diagnostics? We’d love to hear from you!
Leave us a rating and share your experience. Your feedback drives our innovation.

For any feedback or suggestions, feel free to drop us a line at support@otrperformance.com. We’re here for you!

### 4.0.11 — 2026-06-09

Thank you for your continued support and for being part of the OTR community! We're committed to making your experience even better with each update.

Here’s what’s fresh off the diagnostics table:
  • Improve connectivity

We're changing the game when it comes to taking ownership of your vehicle

Enjoying OTR Diagnostics? We’d love to hear from you!
Leave us a rating and share your experience. Your feedback drives our innovation.

For any feedback or suggestions, feel free to drop us a line at support@otrperformance.com. We’re here for you!

### 4.0.10 — 2026-06-08

Thank you for your continued support and for being part of the OTR community! We're committed to making your experience even better with each update.

Here’s what’s fresh off the diagnostics table:
  • Fault code database enhancement
  • Improving auto-lock functionality
  • FAQ Link, Bug fixes and performance improvements

We're changing the game when it comes to taking ownership of your vehicle

Enjoying OTR Diagnostics? We’d love to hear from you!
Leave us a rating and share your experience. Your feedback drives our innovation.

For any feedback or suggestions, feel free to drop us a line at support@otrperformance.com. We’re here for you!

### 4.0.9 — 2026-04-29

Thank you for your continued support and for being part of the OTR community! We're committed to making your experience even better with each update.

Here’s what’s fresh off the diagnostics table:
  • Bug fixes and performance improvements

We're changing the game when it comes to taking ownership of your vehicle

Enjoying OTR Diagnostics? We’d love to hear from you!
Leave us a rating and share your experience. Your feedback drives our innovation.

For any feedback or suggestions, feel free to drop us a line at support@otrperformance.com. We’re here for you!

### 4.0.8 — 2026-04-24

Thank you for your continued support and for being part of the OTR community! We're committed to making your experience even better with each update.

Here’s what’s fresh off the diagnostics table:
  • Bug fixes and performance improvements

We're changing the game when it comes to taking ownership of your vehicle

Enjoying OTR Diagnostics? We’d love to hear from you!
Leave us a rating and share your experience. Your feedback drives our innovation.

For any feedback or suggestions, feel free to drop us a line at support@otrperformance.com. We’re here for you!

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*