Modern vehicles have become smarter than ever. They use sophisticated technologies like the onboard diagnostic system to monitor and detect issues with various components.
When this system detects a problem with the car, it generates a diagnostic trouble code (DTC). The system will also display a warning light on the dash to alert the driver. To identify the problem, you must use a diagnostic tool to scan and read the generated trouble code.
Unfortunately, your diagnostic tool may fail to recognize a code and display the “DTC definition not found.” So, what does this cryptic message mean, and what can you do when you receive it? Read on for more insights.
Question: What Does DTC Definition Not Found Mean?
The “No DTC Definition Found” is a message a diagnostic tool displays if it doesn’t recognize a particular code.
When you plug in the diagnostic tool, it scans for codes and reads them. A fault code will have a letter and a series of numbers. You must note down the codes and interpret them. Some diagnostic tools will provide the DTC meaning. This helps you to identify the problem your car has.
However, your diagnostic may successfully scan and read a code from the onboard diagnostics but fail to recognize it. In other words, your diagnostic tool may fail to define the DTC. When this happens, the tool will display this message.
A diagnostic tool can display this message for several reasons. Let’s see the causes and how to fix this issue.
Answer: Causes of No DTC Definition Found
The leading causes of No DTC Definition Found are:
- Outdated diagnostic tool
- Manufacturer-specific codes
- Software glitch
- Uncommon trouble codes
Outdated Diagnostic Tool
Your OBD-II scanner is the primary suspect when you receive this message. An outdated diagnostic tool can’t work with the onboard diagnostic system to read and interpret the generated DTC.
The truth is, like other computer devices, diagnostic tools require software updates over time. Doing this allows them to keep them updated with the newest DTC database. An outdated scanner won’t recognize newer fault codes that manufacturers introduce.
Manufacturer-Specific Codes
Some manufacturer-specific trouble codes require the use of brand-specific diagnostic tools. So, an aftermarket diagnostic tool might fail to recognize a code saved in your car’s onboard computer. If this tool fails to interpret a code, it’ll display the “No DTC Definition Found” message.
Software Glitch
Diagnostic tools are tech tools that may experience software glitches. Connecting this tool to the car’s OBD-II port might scan a trouble code but fail to define it. Sometimes, the software glitch will cause the diagnostic tool to malfunction, failing to scan and retrieve trouble codes.
Uncommon Trouble Codes
All diagnostic trouble codes are standardized and relate to a particular car component or part. These codes are universal, allowing car owners and mechanics to diagnose problems. However, some DTCs are less common, and not all diagnostic tools can interpret them.
If you have a scanner that’s not programmed with these less common DTC definitions, you’ll receive the “definition not found” message.
Answer: How to Fix the No DTC Definition Found Problem
Here’s how to fix this issue.
Update Your Diagnostic Tool
Diagnostic tool manufacturers provide free software updates to ensure these tools are compatible with the latest DTC database. In this case, visit the manufacturer’s website and check for updates. Download the latest software updates from the website and install them in your diagnostic tool.
Updating your diagnostic tool might add newer definitions and resolve the “definition not found” problem. If you can’t update your scanner, contact the manufacturer’s support or a technician for help.
Use a Different Diagnostic Tool
Most inexpensive diagnostic tools in the market will only define the elementary trouble codes. If you have one of these tools, consider using a different, more advanced OBD-II scanner. Investing in a high-quality diagnostic tool will help you save more money in the long run.
You can also use a brand-specific diagnostic tool to interpret manufacturer-specific codes. But before purchasing an OBD-II scanner, check its specifications to know if it’s compatible with your car.
Consult Your Vehicle’s Manual
If your diagnostic tool can’t define an error code, note it and check its meaning in the vehicle’s manual. You might find this code and its meaning in the manual.
Seek Help from Online Forums
There are many online forums where car experts and owners share and discuss trouble codes. Find if any of these forums have information about the elusive trouble code. You may also ask for the definition of this code from the forum’s main landing page or its Question & Discussion section.
Visit a Professional
Visit an auto repair shop or a dealership for professional help. A repair shop or the dealership might have an advanced diagnostic tool to read and define this code. Moreover, a professional familiar with the car’s brand might know the definition of this elusive code, even without using a diagnostic tool.
Question: Is DTC Definition Not Found a Serious Issue?
The No DTC Definition Found message doesn’t affect your vehicle’s performance. It’s an issue with the diagnostic tool failing to recognize a given trouble code.
However, as mentioned earlier, DTCs indicate vehicle parts or components issues. If your scanner doesn’t define a particular trouble code, it means you can’t identify and fix the root problem. The issue may worsen over time and affect your vehicle’s performance.
Failure to resolve this problem may result in costly maintenance. Moreover, issues related to the engine, transmission, or electronics may cost a lot to repair or replace the defective parts. If you encounter this problem, resolve it on time to avoid unwanted consequences.
Question: Does Clearing a DTC Code Resolve the No DTC Definition Found Issue?
One of the methods car owners use to resolve trouble codes is clearing them. The following steps will help you clear the codes:
- Connect your diagnostic tool (OBD-II reader) to the car’s OBD-II port.
- Turn on the scanner and the ignition. This step lets the scanner and your car’s onboard diagnostic system communicate.
- Navigate the scanner’s menu and select the “Read Codes” option.
- Once your scanner displays the codes, select the “Clear” option.
When you clear trouble codes, your car will think you’ve fixed the root problem. Doing this may get your vehicle in good functioning order. Clearing fault codes will also help turn off the blinking warning light on the dash.
Note: Clearing the trouble codes doesn’t fix the problems that triggered the codes. So, the onboard diagnostic system will generate these codes after driving a few miles. It will also turn on the warning light. The best way to address the “no definition found” issue is by looking for its meaning and fixing the root problem.
Bottom Line
The DTC Definition Not Found issue implies a problem with your diagnostic tool. You might have an outdated tool, an incompatible tool, or software glitches preventing the scanner from defining a code.
If you encounter this problem, update the scanner or use a different, more advanced tool. Alternatively, consult your car’s manual or seek professional help to help interpret this elusive code. You’ll also need to fix the problem that triggered this code to avoid further damage to the car and costly repairs.