How to Reset VW Computer After Battery Change?

If you’re like most people, you probably don’t think about your car’s computer. But if something goes wrong with it, you’ll wish you had. That’s because the computer controls a lot of what goes on in your car, from engine performance to airbags. So if something malfunctions, don’t worry – we’re here to help. In this post, we’ll walk you through the process of how to reset VW computer after battery change. So whether you’re a first-time VW owner or just need a refresher, read on for all the details.

First, let’s start with the basics. What is a computer, and why do we need to reset it? A car‘s computer, or ECU (electronic control unit), is a small but mighty piece of equipment that controls everything from engine performance to airbags. In other words, it’s responsible for making sure your car runs smoothly and safely. If something goes wrong with the computer, it can cause all sorts of problems – from a check engine light that won’t go off to decreased performance or even a complete loss of power. You might notice that your VW won’t start after replacing battery. So, you’ll need to reset car computer after replacing battery yourself so it can properly track the new battery’s performance.

That’s why it’s important to know how do VW computer reset after a battery change – just in case something does go wrong. The good news is that the process is actually pretty simple. Here’s how to do it:

  1. First, make sure your car is turned off and in park mode.
  2. Next, locate your car’s battery. On most VW models, the battery is located in the front of the car, near the grill. Once you’ve found the battery, locate the two terminals at the top. There should be a positive (+) and negative (-) terminal on each side. Using a screwdriver or wrench, loosen – but don’t remove – the clamp on the negative terminal. Do the same thing on the positive terminal.
  3. Now, wait a few minutes for the computer to reset.
  4. Finally, reattach the clamps to the terminals and tighten them up.

The procedure in resetting the ECU may vary depending on the year and model of your vehicle, so it’s important to consult your owner’s manual or a professional mechanic if you’re unsure about the process. Additionally, resetting the ECU may not always solve the underlying issue with your vehicle, so it’s important to diagnose and address any problems before attempting to reset the ECU.

Another common reason for resetting the ECU is to clear any error codes that may be present. When a problem is detected in the vehicle’s systems, the ECU will typically store an error code that can be read using a diagnostic scanner. Clearing these error codes can be done by disconnecting the battery or using a diagnostic scanner to reset the ECU.

Overall, resetting the ECU can be a useful tool for troubleshooting and maintaining your vehicle. However, it’s important to follow the proper procedures and consult a professional if you’re unsure about the process.

What could be the problem why VW won’t start after changing the battery?

There are different reasons why a Volkswagen may not start after a battery change. One of the most common reasons is that the computer has not been reset properly, as mentioned above.

The other possibility is that the alternator was not properly disconnected before changing the battery. This will cause problems with the charging system and can damage other electrical components in the car.

A faulty battery cable can also be a reason why VW won’t start after a battery change. If this is the case, it’s best to take your vehicle to a mechanic to have it checked out.

Another reason is a malfunctioning immobilizer. The immobilizer is a system that prevents the car from being started without the correct key, mostly known as the electronic security device installed in your VW. To reset the immobilizer, you can either bring your VW to an authorized car dealer or do some DIY work by disconnecting the battery cables, leaving it disconnected for about 15mins and then reconnecting them.

If you have tried all of the methods mentioned above and your VW still won’t start, then it is most likely that there is a more serious problem with the car. In this case, it would be best to take it to a mechanic for further diagnosis and repair.

How do you reset the computer on a Volkswagen Jetta?

The Volkswagen Jetta is a compact car that was introduced to the market in 1980. It’s now in its fifth generation, and each generation has gotten progressively more upscale and luxurious.

Some of the features that come standard on the latest model (the 2019 Jetta) include heated seats, a 6.5-inch touchscreen display, leatherette seating surfaces, Apple CarPlay/Android Auto integration, and automatic emergency braking. You can also upgrade to features like a panoramic sunroof, lane departure warning system, adaptive cruise control, and keyless start/entry.

A Volkswagen Jetta is equipped with a computer in it. This computer controls many things in the car, including how it starts and how it runs. If you change the battery in your Jetta, you will need to reset the computer so that it can learn about the new battery.

To reset the Volkswagen Jetta computer, you can use an OBD 2 scanner. This is a recommended device for Jetta models that plug into the car’s computer and can be used to reset it. Once you have your scanner plugged in, turn on the ignition, press the power button on the scanner then choose reset. This will reset the computer and allow it to learn about the new battery.

If you don’t have an OBD 2 scanner, there are other diagnostic code readers available. This is a device that plugs into the car’s computer and reads any error codes that might be present. Just be aware that there are many scams out there, so be sure to do your research before purchasing a code reader and make sure it’s compatible with your Volkswagen Jetta.

If you’re not comfortable resetting the computer yourself, or if you have any other questions about your Volkswagen Jetta, don’t hesitate to reach out to a certified mechanic for assistance. They will be able to help you with anything that’s wrong with your car, and they will be able to reset the computer if necessary. This way, you can ensure that your car is running smoothly and that all of its features are working properly.


Changing the battery on your Volkswagen can sometimes result in your car not starting. This could be due to the computer not being reset properly, a faulty battery cable, a malfunctioning immobilizer, or other issues. It’s important to diagnose and address these issues promptly to prevent further damage to your vehicle.

Remember, if you’re not comfortable troubleshooting and repairing your car yourself, seek help from a qualified mechanic. They have the knowledge, experience, and tools necessary to diagnose and repair any issues with your car, including resetting the computer on your Volkswagen Jetta.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.