Updated at: 05-03-2022 - By: micdot

For a variety of reasons, the OBD2 is critical to a car’s operation. For example, a vehicle’s reporting and self-diagnostic capabilities are examples of this. In a nutshell, this component informs the owner or mechanic of your car’s current system state. As a result of this, your OBD2 must be plugged in. So, the question is:

In the event that my OBD2 has electricity but refuses to connect, what should I do? In most cases, the OBD2 won’t work because it lacks electricity. But if it has power but refuses to connect, you may want to examine its connection to the rest of your system. Most of the time, it’s either a problem with the wiring or an issue with the OBD2 system itself. As a result, you’ll need to get it serviced shortly. OBD2 is a feature that is quite beneficial in the process of diagnosing a vehicle. You may not have time to check if anything breaks down, but if it does, it can be frustrating. Because of this, you’ll need to know how and why it occurs. You’ll learn everything you need to know about OBD2 and the potential issues it can cause in your vehicle, particularly with the wiring. When you understand how it works and what to do if it ever happens to you, you’ll be more prepared.

Let’s get started, shall we?

Why Is My OBD2 Port Not Communicating?

OBD2 ports sometimes have communication problems, which might be inconvenient. However, you can look at three of the most common reasons of these problems.

There are a number of possible reasons why your OBD2 port may be failing to communicate with your vehicle.

Blown OBD2 Fuse

One of the most common causes of an OBD2 port not communicating is a blown fuse. Fuse blowing prevents communication even if power is present.

As a result, the cigarette lighter is one of the best ways to check your OBD2. As a result, your OBD2 may not be able to communicate if the fuse in your cigarette lighter is blown. In this case, you can start playing about with your cigarette lighter. The cigarette lighter is typically used to power the vehicle’s system for communicating with testing equipment in most vehicles. As if the fuse were a light bulb, the interior of the fuse will be black and unattachable if the power lines within the fuse have been burned apart and no longer connect.

The onboard diagnostic (OBD) computer cannot be connected because the data link attachment (DLC) is damaged or interfered with. There are a number of reasons why the DLC can fail, including as being damaged or burned, being used to charge a gadget, or being plugged in.

The OBD2 port receives data from the vehicle’s computer via the data link connector. Thus, if the OBD2 port fails to communicate, it is conceivable that the data link connecter has been broken or is malfunctioning. In most cases, these issues necessitate the expertise of a trained technician.

Improperly Installed Aftermarket Systems

Third-party devices such as stereos and other electronic devices can be powered by the DLC or OBD2 port wire harness of some aftermarket system distributors.

An OBD2 tester may not be able to communicate with the car during an examination if it detects manipulation. Assuming that the DLC and the fuse are functioning properly and your OBD2 is still not communicating, this is the most likely culprit.

What to Do When Your OBD2 Won’t Connect?

If your OBD2 isn’t connecting or communicating, you’ll need to take action. There are a number of ways to deal with the problem, including the following:

Check your car’s cigarette lighter.

If your OBD2 isn’t communicating despite having power, a blown fuse may be to blame. Because of this, you might want to inspect the cigarette lighter in your automobile. In this technique, you may inspect the fuse and replace it if necessary.

Check the wiring of third-party systems.

You may also want to examine the wiring of any third-party tools or accessories that you have installed, as these can cause problems if they are not correctly placed.

You can ensure that the OBD computer and its power and connection supply will not be interfered with by inspecting these connections.

Contact your dealer or your car’s service center.

Your car dealer or your unit’s service center may be able to help if your OBD2 port problem persists.

If the OBD2 systems fail, you’ll be able to get help from mechanics and technicians. Also, they offer an OBD generic tool that does some sort of analysis. Finally, the DLC or data link connector will be connected and other procedures will be taken to fix the non-communication issue.

Check the OBD computer.

Any OBD computer tech support advisories and servicing plans should be examined. If you notice any of the following problems with your car, call your local dealership or service center and ask them to investigate.


In a nutshell, the OBD2 is critical in determining the cause of your car’s malfunctions. In the event that communication ceases, it might be extremely frustrating. Generally, taking your OBD2 to a mechanic is the best option for getting it fixed. However, you may save a great deal of money, time, and effort by being aware of the probable reasons of this problem.

If you ever run into this problem, following the procedures outlined above should be able to assist you resolve it. Taking it to a service center is the next step if the problem persists despite your attempts.