How To Clear Obd1 Codes Without Using A Scanner?

Do you know a wide variety of codes indulge in your vehicle controlling and maintaining multiple signals? Each code is meant for a specific task and determines the particular issue in the car. The emergence of specific signs takes place through the computer. Here, in this article we will cover few essential and crucial points regarding the obd1 codes in vehicles, what it is, how to clear obd1 codes without using scanner, its importance, and many other frequently asked questions.

We will discuss all the subheadings in detail and find the solution to the problem you are looking for in general. So, let’s begin with the topic and elaborate on the essential and highlighted points.

What Are The Obd1 Code In The Vehicle?

If you have a GM car between 1980 to 1995, more particularly of the 90’s era, there is a huge possibility that your vehicle has an obd1 connector (ALDL) in your car model. It is a unique connector and applies to Pontiac, Chevrolet, Oldsmobile, Cadillac, Buick, and many other models.

The best part regarding the connector is that you can read your trouble codes at home without any diagnostic tools. However, there is a unique diagnostic tool for vehicles that lack this kind of connector.

How To Clear Obd1 Codes Without Using A Scanner?

The obd1 code generally means checking the engine light turns on. The emergence of light could indicate various problems, including minor issues to significant issues with your transmission. Some people often switch off the light, but the light comes back soon, signifying a severe problem that needs immediate fixation.

Whenever such a situation arises, visit the professional to know the exact cause and reason behind the problem. So, let’s clear the obd2 codes without a scanner requiring or taking few steps to attain the desired result.

Step 1:

The very step begins with switching off the vehicle’s engine and open the hood of the car. You may initiate the action after parking the car in a safe and levelled area. We request you don’t forget to engage the parking brake before pop opens the hood.

Next, disconnect or remove the negative (-) black cable from the battery. And you can do this by using a wrench to loosen the clamps present on the battery terminals. Soon after this, remove the positive (+) red cable also from the battery.

The most crucial point you must remember while removing the wires is to keep them apart, and under no circumstances should you allow the terminals from touching each other as this would lead to severe damage and a short circuit.

Step 2:

When you are done with removing the terminals of the battery cables, proceed to the next step. Here, you should move to cycle the ignition switch to the ON and OFF position at least three to five times to fulfil the need or requirement. Also, remember to leave the battery terminals disconnected for a minimum of one minute before switching to this step.

Step 3:

Before moving on to this step, we recommend you to wait for another ten to fifteen minutes prior to reconnection of battery terminals. Now reconnect the battery terminals using an appropriate size wrench. However, the reconnection of black coloured positive cable occurs first, followed by the negative black-coloured cable in the car.

At the end of the step, don’t forget to tighten the clamps adequately present in the vehicle.

Step 4:

By following the points mentioned above, you had almost completed your procedure for clearing the obd1 code. Here, you need to start the engine and allow the vehicle to idle for at least five to ten minutes.

Inevitable fluctuations may observe during the idling process, so don’t panic or shock by experiencing the changes. After all, they are pretty standard during the process.

Step 5:

So, it is the last step of resetting or clearing the obd1 code. Thus, in the end, you can try or test your vehicle by driving, usually for approximately five minutes. The driving of the car will allow the computer system to readjust the operating parameters.

Hence, your task is complete, and the problem is solved. Now, you can enjoy the drive comfortably and smoothly.

How Do I Reset My Obd1 ECU?

First of all, the ECU here stands for the electrical control unit. To initiate the reset, pull the ECU and backup fuses in the fuse box under the hood. Thus, please remove them and leave them out while you are working on the car. Also, unplug the negative cable to the battery for at least ten minutes.

All this would help you to attain the desired result and solve the problem. Soon, the vehicle is back to its proper functioning.

What Years Does Obd1 Cover?

Obd1 is a diagnostic system that supports cars make and model made before 1996. The downside of these scanners is that they are manufacturer-specific, i.e., every vehicle has its peculiarity. Thus, one scanner won’t work on two different brans, although they have the same issues. Therefore, nowadays, obd2 is preferred over obd1, and there are no vehicles manufactured with obd1 codes.

Can You Convert Obd1 To Obd2?

The conversion of obd1 to obd2 is pretty easy as ECU is responsible for this function, not the motor that decides it. Hence, it smoothly interchanged. Your only work is to convert the plugs on the dizzy, fuel injectors, and the alternator of the obd1 motor to work or function with an obd2 harness. Thus, you can also convert your car to run off an obd1 ECU with a jumper harness.


We hope the information mentioned above help and guide you in dealing with the situation correctly. However, by the end of the article, we expect that you know how to clear odd1 codes without using a scanner.

If your doubts or queries regarding the content persist, we request you to please comment below in the comment section. And we’ll make an extra effort to answer all your questions correctly as quickly as possible.