How Totech news

OBD Port Not Working? – DIY Causes and Fixes

Is your OBD port not working? We are here to help you out.  A malfunction or breakdown in an OBD port can freak out any driver, given its importance and high cost. If your OBD port is not working, before you panic attack, there are a few common causes that could be the culprit, and you could efficiently resolve them. Let me walk you through everything you want to know about an irresponsive OBD port. 

What Is an OBD Port? 

The On-board Diagnostics (OBD) port is a standard system connected to the vehicle’s computer system to diagnose and troubleshoot issues in the machine. It is located near the steering wheel, typically around the emergency brake area. OBD is an essential component in the system as it ensures the operation status of the vehicle.

The electronic sensors connected to the port send a signal to the OBD device if any issues or errors are found. It constantly monitors all aspects of the performance of the vehicle. The onboard diagnostics generates near-universal codes on the dash panel, which are relatively easier to read and understand by mechanics and drivers with a code reader or an OBD scanner.

Once the issue is fixed, the computer system automatically deletes the data saving power and efficiency. OBD is now becoming increasingly important with the swift automation of automobiles. Nevertheless, the primary function of the OBD is diagnostics which is crucial in determining the operation status of the vehicle as it stores all data and information on the vehicle’s performance.

Why is the OBD Port Not Working? 

It can be pretty alarming when suddenly your vehicle’s onboard diagnostics won’t turn on or work anymore. It can raise concerns as it will cut off the system communication and prevent you from knowing what is going on with the vehicle’s operation. Not knowing the performance statistics of your vehicle will make it challenging to upkeep the maintenance. Unknown faults and errors could lead to danger and losses. Getting to the bottom of the issue and resolving it should be prioritized. 

Although there can be diverse reasons for your onboard diagnostics to stop working, a few instances might be the cause. Let me walk you through such grounds and how to resolve them. 

Blown OBD fuse 

One of the common reasons your OBD is not working is caused by a blown fuse on the OBD socket power supply circuit. The fuse is typically located under the hood, in the fuse box. Power is supplied to your tool from the OBD socket. You know the power is lacking when the device doesn’t work.

A blown fuse is the most likely reason for an absence of power. To resolve the issue, locate the OBD fuse and inspect it using a test light or volt meter. Or you can pull out the conduction strips using a convenient tool and check for errors. In case of a blown fuse, replace it to regain access to the onboard diagnostics system. 

Damaged OBD port

A damaged or broken OBD port might also be the reason for the OBD port not working. It will hinder you from connecting any diagnostic tool to access error codes transmitted by the sensor.

Many factors contribute to damage in an OBD port, such as exposure to extreme temperature, prolonged stay in direct sunlight, and other forms of physical force. You can fix this issue yourself, although it is advised to consult a professional to avoid any mistakes resulting in the worst outcomes. 

Try checking the terminals of the port using any source of clear light. Check for spreading in the airports and examine the tension levels. If the tension is low, slowly tighten the terminal legs using a convenient tool. It would be best if you were careful when doing so, as you can unintentionally damage or break the legs of the terminal. Therefore, use an appropriate tool for this purpose. 

If there are no faults in the OBD port terminals, the issue might be the wiring system beneath the dash panel. Inspect the wiring for any errors.

Loose connection

A loose wiring connection can also be a reason for your OBD port not working suddenly. Readjust the OBD port and ensure all the connector pins are tightly connected. Please do not overdo it, as it can damage the nails and require a replacement. 


Software incompatibility can also leave your OBD port with no response. The OBD scanner you are using is incompatible with the vehicle’s computer system. Replacing a compatible version of the onboard diagnostics scanner will fix the problem.


Reset or reprogram. If the issue is due to software traffic, resetting the OBD system will do. To do that, dissemble the batteries and reconnect them after a few minutes of interval. Suppose the problem does not resolve after a reset. In that case, you will have to reprogram the system to ensure the vehicle control system’s software work correctly. 

Damaged OBD scanner

Plugs of OBD scanners are known for their durability. But there is a possibility for the pin to be damaged or worn out. A worn-out or damaged OBD scanner plug will result in OBD not working. Check the plug for impairments. Ensure that all the pins are in good shape. If any pin is broken or bent, it will not be able to align successfully with the respective port. Replace the plug if pins are found faulty. 

System disability 

Some vehicles have the facility of turning on and off the OBD system. This function helps save power and elevates the protection of privacy. Sometimes you might have just forgotten to activate the onboard diagnostics systems, which might be why your OBD is not working. 

Damaged scanner fuse 

A malfunction in the fuse of the scanner would also result in an overall malfunction of the OBD system. You will need to open up the scanner to inspect the fuse. It is recommended to turn to a professional to avoid any mistakes from happening. Or if you have the skills and tools, you may work it out on your own.

 You May Also Like: 

Leave a Reply

Your email address will not be published. Required fields are marked *