OTR Diagnostics redesigned layout helps you run advanced diagnostic functions, including a forced DPF regen from your mobile device easier than ever before.

Chassis Coverage
- Freightliner Trucks — All Models
- Western Star Trucks — All Models
What comes with the package?
- OTR Diagnostics App Download
- OTR Diagnostics 12 Month Subscription
- OTR Link - Mini Adapter
- OTR Crossover Adapter
- OTR OBD Adapter
- Instructions Manual

Detroit Diesel Commands
9 Pin Plug
- EPA07 (2007-2010) DPF Only
- Reset Fault Codes
- Reset Ash Accumulator
- Start Forced DPF Regen
- EPA10 (2011-2013)
- Reset Fault Codes
- Reset Ash Accumulator
- Reset SCR Accumulator
- Start Forced DPF Regen
- GHG14 (2014-2016)
- Reset Fault Codes
- Reset Ash Accumulator
- Reset SCR Accumulator
- Start Forced DPF Regen
- GHG17 (2017-2021)
- Reset Fault Codes
- Reset Ash Accumulator
- Reset SCR Accumulator
- Start Forced DPF Regen
NOTE: OTR Diagnostics is not compatible with the OTR Reset Tool.
ENGINES COVERED (9pin)
Engine | Emission |
DD60 | EPA07 (DPF Only) |
DD13 | EPA07 (DPF Only) |
DD15 | EPA07 (DPF Only) |
DD60 | EPA10 (DPF + DEF) |
DD13 | EPA10 (DPF + DEF) |
DD15 | EPA10 (DPF + DEF) |
DD16 | EPA10 (DPF + DEF) |
DD13 | GHG14 (DPF + DEF) |
DD15 | GHG14 (DPF + DEF) |
DD16 | GHG14 (DPF + DEF) |
How OTR Diagnostics Works
Set up in a few simple steps.

Step 1
Select diagnostics package for your engine

Step 2
Connect adapter to vehicle diagnostic port

Step 3
Download OTR Diagnostics app for your mobile device

Step 4
Begin using OTR Diagnostics app
APP FEATURES

Enhanced Fault Code Descriptions
Read Fault Codes. You’ll be provided with enhanced detail fault code information.
For instance, you’ll see the following displayed:
SPN 5394 | FMI 3
- Aftertreatment diesel exhaust fluid (DEF) dosing valve
- Engine Controller
Detailed fault code information, will be provided such as description, troubleshooting, symptoms and possible fixes.

Fault Code Commands
Reset Active Fault Codes. Fault codes that determine that there is an existing issue. Certain active fault codes can be cleared, however, if the problem has not been fixed the fault code will reappear prompting you to seek service.
Reset Inactive Fault Codes. Fault codes that indicate that there was a previous issue.
Clear first-time ‘Ghost’ Codes. To get rid of ghost codes, all you have to do is reset the fault codes with OTR Diagnostics.
What’s a ghost code? Specific trucks will display fault codes on the dashboard, and most of the time you’ll have a check engine light or a check module message. After this, a screen will appear stating that the error has occurred. Many of the codes that appear on your dashboard fall into the category of “ghost” codes, meaning that the fault code was triggered by certain conditions that are nearly impossible to recreate. To get rid of ghost codes, all you have to do is clear fault codes with the OTR Diagnostics and clears the DTCs once. Note that if the fault code comes back a second time, you do need to take the matter seriously.

Aftertreatment Commands
Forced DPF regen. A forced DPF regen is performed when a diagnostic scan tool, such as the OTR Diagnostics, starts the regen process. The DPF soot load could be too high for a passive or active regen to occur, meaning you’ll need to perform a forced DPF regen.
Reset Ash Accumulators. Ash accumulators have stored values in the engine control module (ECM). Ash level includes measurement of ash in the DPF.
Reset DPF Accumulators. DPF accumulators have stored values in the engine control module (ECM). DPF level includes measurement of soot in the DPF.
Reset Aftertreament Learned Data. Measurement of learned data based on various engine components to adjust your injection timing based on characteristics of your engine sensor values.
Reset DPF Regeneration Timers. Measurement of time since the last DPF regen occurred. The calculation is based on time, miles driven, and fuel usage.

Fault code history and command history
Quickly reference recent fault codes, how often they occured and date stamp when it first occured.
View commands with status history for how long forced DPF regen lasted, clearing fault codes and reset aftertreatment status.

Display Parameters
Live data is information that gets updated in real time. This includes vital information about your engine and your aftertreatment system. The live data fields will be updated in real time through the Bluetooth connection.
Why is live data important? Live data is an important feature that can help solve an intermittent issue or it can be used to get more information from your aftertreatment system during a DPF regeneration.
Some of the parameters you can track with OTR diagnostics include
- DEF Fluid Level
- DPF Soot Level
- EGR Value Position
- Aftertreatment Exhaust Temps
- Battery Voltage
- Boost Pressure
- Accelerator Pedal Position
- Engine Fuel Delivery Pressure
- + many more
OTR Diagnostics FAQ
How does the subscription work?
Does this App need to be online to be used?
I currently have a compatible Bluetooth Adapter. How can I purchase only a subscription?
If I have an existing OTR Performance account, how do I link my OTR Diagnostics subscription to the account?
Which platforms Is OTR Diagnostics available for?
How do I create an account?
We have a couple of different ways to create an account. You can create an account on a web browser OR by using the mobile app. Follow the details below to get started.
Create account with otrperformance.com
- Create an account on a web browser at OTR Performance
- Purchase your subscription and use your email that is attached to your OTR account.
- Download and use credentials created to use the mobile application.
OR
Create account on the OTR Diagnostics mobile app
- You can register by using the app
- Purchase your subscription and use your email that is attached to your OTR account.
- Use credentials created to login into mobile "OTR Diagnostics" Application

60-Day Guarantee
We get it, you don’t know us very well yet. That’s why OTR Diagnostics comes with a 60-day, no-hassle, money-back guarantee. If this doesn’t fit your needs for any reason, just let us know within 60 days, and we’ll refund 100% of your purchase price. We’ve got your back.

USA Support
Located in Detroit MI, (EST). A truly committed team of trained experts that are there to assist with any customer service, technical support or general questions you may have. No bots. Real help from real people, when you need us! Contact us via phone, chat, or email anytime.
- This product will not bypass the operation of any emission control component. This is used solely to reset the modules after replacing aftertreatment components or initiating a forced regeneration.
- Phone and/or tablet not included.
- Reviews
- Questions
OTR Diagnostic
Great product and responsive customer and tech support


2017 Freightliner a cascadia DD15
The diagnostic software has worked great for me so far. I have cleared a few codes, and forced a regeneration. Once a week or so I will hook up and use the live data to check the health of the truck. Tool seems very easy to use and a quality product so far

RCE TRANSPORTATION RECOMMEND OTR
It does what it was made to do, I'm happy to have it, it help me out quite a few times out on the road, I recommend it to you, you don't know when you might have an issue that you can help yourself with and make it to a safe populated area to get help if needed. OTR

A must have tool for
A must have tool for every owner/operator. Saves tome amd money from having to wait on the side of the road for a mobile mechanic or trying to get to a truck repair shop or dealership to get diagnostics and hefty bills for After-Treatment related issues.

Awesome tool!! had to use
Awesome tool!! had to use it one time to force a reset. It saved me money by not having to call a someone to come out to me to. We all know how much that could've costed!!

Excellent
Easy to use tells you what’s the code is what’s the problem save me a lot money not going to a truck stop paying 150 just to have the same information that the OTR will give you I’ll recommend to every trucker out there.