OBD2 Fuse Blown – Its Causes & How To Fix It?

OBD2 is an acronym for the term “on board diagnostic,” which is a fuse primarily found in vehicles. It is required for incorporation within a car’s software and hardware so that OBD2 can virtually monitor and impact the emission performance and emission-related parts of a car. You must regularly check every component to avoid the OBD2 fuse blown.

However, when an OBD2 fuse blows out or if a malfunctioning is detected, the OBD2 system indicates a warning sign on the display board behind the steering to inform the driver about it. The sign will usually display “Check vehicle” or “engine service” and an engine symbol; sometimes, it will indicate nothing, which means a malfunction.  

What Causes Of OBD2 Fuse Blown 

An OBD2 fuse blown can cause various difficulties in the smooth operation of a vehicle; however, if you ever encounter such a scenario, follow this quick solution that we are about to suggest. 

Before fixing your OBD2 fuse, you must ensure that the problem originates because of the OBD2 scanner and that no error occurs in any other vehicle’s component. 

The most straightforward way to confirm it is to check the view of the check engine light, which will not illuminate, signifying the OBD2 fuse has blown. It is crucial to locate the fuse, which you may find in the trunk, behind the dashboard, or under the hood. Then plug the fuse out of the box using a puller too. Cautiously examine it and if the fuse strip is broken, then fit in a new OBD2 fuse.  

A detailed guide About How To Fix OBD2 Fuse Blown

Previously, we provided you with a quick solution to fixing your OBD2 fuse blown. If you have the time, undertake the entire process of repairing the fuse in-depth and accurately to avoid any errors. Also, arranging your faulty OBD2 fuse concerning our detailed guide will save you the costs of hiring a mechanic to do the job for you. 

Determining the OBD2 fuse’s location 

Firstly, you need to determine where your OBD2 fuse is located. This step can be tricky because each vehicle comes with various fuse boxes, so you have to keep an eye out for finding the right one.

Ordinary locations for an OBD2 fuse box include under the hood, behind the dashboard, and sometimes in the trunk. To simplify this step, you can look for the particular fuse box which would correspond with the characteristics of your OBD2 fuse, such as 12V power point, accessory point, and DLC. 

If you are still unable to identify it, then your last resort is to consult the manual. In the manual, you will find the exact locations for the fuse box to look for the OBD2 fuse, along with its color, type, size, and rating. 

Analyze the OBD2 fuse condition 

After you have succeeded in determining the location of the OBD2 fuse box, you must examine it for its condition. Carefully plug the fuse out of its rear compartment, and using a flashlight look out for any cracks, dents, or broken parts inside the box.  

Putting right your OBD2 Fuse 

To put your fuse right, purchasing an OBD2 fuse compatible with your vehicle’s technology is imperative. Else, it will blow out again. Pay additional attention while considering the size of your fuse as the primary reason for an OBD2 to blow out is because of unaccommodating specs. If you want to play safely in repairing the fuse, go for a replacement within 15-20AMP; however, do confirm with the recommendations by the manufacturers as the models keep variating. 

Reasons for malfunctioning of OBD2 fuse

odb2 code scanner

An OBD2 fuse blown is a frequent circumstance to be encountered by most car owners. It is not as technical of an issue as it seems because there are different reasons the OBD2 fuse blows out, and they blow out quite quickly. Therefore, we have listed the most common reasons for it to happen. 

Poor computer car engineering 

Even after inspecting the OBD2 fuse, you find it intact to the port, but it is not illuminating the car engine. Then the reason for the blown-out fuse is that the computer car engineering has been poured. It is definitely to be blamed for the OBD2 fuse blown. This means that the port that secures the OBD2 fuse was constructed poorly, leading to it breaking down. Thus, resulting in the malfunctioning of the fuse. 

Broken connection plug of the OBD2 fuse 

Frequently, the malfunctioning of the fuse occurs due to it blowing out; however, sometimes, the issue might be the plug. The plugin in which the fuse is inserted breaks down often due to the regular wear and tear it is subjected to. Undoubtedly, the connecting cables and the plug are durable. Still, because of the excessive use of your vehicle, they tend to heat up, deteriorating the formation material of the specific parts. 

Inoperative OBD2 port 

A blown OBD2 fuse is part of your car’s electrical complications, which you are bound to be surrounded by. The fuse to remain intact and working requires an electricity supply from the car’s engine, which is provided through the port in which it is inserted. However, when an electrical connection to the OBD2 port is hindered through any inconvenience, it causes the OBD2 fuse to not function. 

Frequently Asked Questions About OBD2 Fuse Blown

Can repair of an OBD2 fuse blown damage your car? 

Repairing the OBD2 fuse blown will not damage your car; however, it is always advisable to approach the circumstance with ultimate cautiousness. 

Is OBD2 Port replaceable?

Yes OBD2 port is replaceable and spare parts can be easily found on Amazon and in local markets. 


In this article on OBD2 fuse blown, we have tried our best to summon up causes for the problem and presented you with an in-depth guide to counter the issue. Therefore, we hope that this article assists you in resolving the OBD2 fuse situation on your own without consulting a mechanic. So, good luck in dealing with your OBD2 fuse blown! 

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Hi! My name is Tom Watson Founder of Garage Fortress. I am happy to say that I am the owner of Garage Fortress which is a website focused on automotive technology and cars. I studied technology for 15 years at a university and got an Advanced Technical Certificate in Automotive Technology.

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