Does Disconnecting The Battery Clear Engine Codes [Expert-Advice]


When your check engine light comes on, it’s usually accompanied by a sinking feeling in the pit of your stomach. You know that it’s going to be expensive to fix, and you’re probably wondering if there’s anything you can do to clear the codes and make the light go away. You might have heard that disconnecting the battery will clear the codes, but is that true?

In this article, we’ll take a closer look at what happens when you disconnect the battery and whether or not it will clear the codes.

Does Disconnecting The Battery Clear Engine Codes?

When your check engine light comes on, it’s usually accompanied by a sinking feeling in the pit of your stomach. You know that it’s going to be expensive to fix, and you’re probably wondering if there’s anything you can do to clear the codes and make the light go away. You might have heard that disconnecting the battery will clear the codes, but is that true?

Let’s take a closer look at what happens when you disconnect the battery and whether or not it will clear the codes.

First, it’s important to understand what the check engine light is trying to tell you. The light is triggered by a sensor in your engine that detects a problem. When the sensor detects a problem, it sends a signal to the engine control unit (ECU). The ECU then turns on the check engine light to alert you that there is a problem.

So, what happens when you disconnect the battery? When you do this, it clears the ECU’s memory. This means that the ECU forgets about the problem that triggered the check engine light in the first place. However, it’s important to note that the problem has not been fixed. The light will come back on as soon as the ECU detects the problem again.

In some cases, you might be able to drive for a short period before the light comes back on. However, it’s not advisable to do this because the problem could cause further damage to your engine. It’s always best to get the problem fixed as soon as possible.

So, to answer the question, yes, disconnecting the battery will clear the codes and make the check engine light go away. However, it’s only a temporary fix. The light will come back on as soon as the ECU detects the problem again. If you want to fix the problem for good, you’ll need to take your car to a mechanic and have them diagnose and fix the problem.

How Long Do You Wait After Disconnecting Car Battery?

It is important to wait at least 15 minutes after disconnecting the car battery before starting the engine.

This will ensure that the car’s computer, or ECU, is reset.

How Many Miles Do You Need To Drive To Reset Computer?

Assuming you have completed all the necessary repairs and your car is running smoothly, you will need to drive between 50-100 miles to reset the computer.

This will allow the computer to recalibrate and hopefully get rid of the check engine light once and for all.

Of course, there are always exceptions to the rule, so if your check engine light comes back on after driving a few hundred miles, then you may need to take your car back to the mechanic to have it checked out.

Is It Good To Disconnect Car Battery?

A car battery provides the power necessary to start a car and keep its electrical accessories running. The battery is also what provides power to the car’s computer, which controls the engine and other systems. If a battery is disconnected, none of these systems will work.

A car battery will typically last for four to five years. However, if a battery is regularly used to power electrical accessories when the car is not running, it can shorten the battery’s life. If a battery is repeatedly drained and then recharged, it will eventually stop holding a charge and will need to be replaced.

Disconnecting a car battery can help prevent electrical accessories from draining it. If a vehicle is going to be left unattended for an extended period, it is best to disconnect the battery to prevent it from being damaged.

What Does Disconnecting The Negative Battery Cable Do?

When you disconnect the negative battery cable, you are essentially disconnecting the car chassis from the negative polarity of the battery. This reduces the chance of short-circuiting any components in the car that are connected to the chassis.

Additionally, it helps to prevent any sparks or static discharge that could occur if the negative terminal came into contact with any other metal surface.

What Will Resetting Ecu do?

When you reset the ECU, it clears all the long-term memory from the ECU’s memory. This includes the variables that trim idle speed, fuel, spark, and more.

The ECU will also store trouble codes for diagnostic capability. Resetting the ECU can help clear any trouble codes that may be stored in the ECU’s memory. It can also help improve the overall performance of your vehicle.

Will Disconnecting The Battery Reset Ecu?

A common question we get here at the shop is whether or not disconnecting the battery will reset the ECU. It’s a valid question, especially given how finicky these machines can be. The answer, unfortunately, is not a simple one.

It depends on the car’s age and the type of ECU used. On some older cars, disconnecting the battery will reset the system but in most new cars it does nothing, except potentially reset the clock and radio station presets.

The reason it matters what type of ECU your car has is that there are two types of ECUs: flash and non-flash. A non-flash ECU does not have its programming stored on a removable chip. This means that the only way to change the programming is to physically alter the ECU itself, which is not something most people are going to do.

A flash ECU, on the other hand, does have its programming stored on a removable chip. This means that the programming can be changed without physically altering the ECU. Disconnecting the battery on a car with a flash ECU will usually reset the ECU to its factory default settings.

So, if you have an older car with a non-flash ECU, disconnecting the battery is not going to do anything. If you have a newer car with a flash ECU, disconnecting the battery will reset the ECU.

There are a few exceptions to this rule, so it’s always best to check with your mechanic or the car’s manufacturer to be sure. But in general, if you have a newer car, you can expect the ECU to be reset if you disconnect the battery.

Conclusion

So, to answer the question, yes, disconnecting the battery will clear the codes and make the check engine light go away. However, it’s only a temporary fix.

The light will come back on as soon as the ECU detects the problem again. If you want to fix the problem for good, you’ll need to take your car to a mechanic and have them diagnose and fix the problem.

Liam

Hi, I'm the initiator and writer of this blog. Cars were and will be my first love, and my favorite hobby, that's why I decided to start this blog and write about my discoveries and techniques to improve my cars or repair them.