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A Key system error on your 2019 Nissan Altima can make your day frustrating. Until the issue is resolved, the vehicle cannot be started. But how do I fix the 2019 Nissan Altima key system error?

The weak or dead key fob battery is the major issue for Nissan Altima key system errors. You can recharge or replace the battery to fix the problem. However, you may need to check for other issues, such as faulty key fobs, faulty antennas, and software glitches. Resetting the key system may also work.

Join me to learn how to fix the key system error warning issues on Nissan Altima. Let’s get started!

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Common Symptoms of Key System Errors

Key System Errors
Nissan Altima dashboard displays ‘Key System Errors’ message, indicating potential key-related issues. Attention is needed for resolution.

Different symptoms in your Nissan Altima can identify key system errors. Here I have listed the five major signs that tell you you have key system errors.

  • The system key error warning light turns on with error codes
  • You may experience the program closing unexpectedly; it may freeze or display the error message
  • The system is working, but the response is very slow to your commands; it may take a lot of time to load and execute the functions
  • You may experience hardware failure issues, strange noises, and system overheating 
  • Unusual file behaviors, such as data loss or unreadable files, can be a symptom of key system errors

Causes of Key System Errors

Usually, key system errors on the 2019 Nissan Altima occurs due to a dead key fob battery. However, a few other reasons can cause key system errors. Here is a list of a few prominent issues that may cause key system issues.

  • Faulty Key Fob
  • Faulty Antennas
  • Software glitches

Learn how to troubleshoot a Nissan Altima no key detected issue effectively in this informative article. Discover essential tips and solutions to resolve this problem with ease.

2019 Nissan Altima Key System Error- Problems & Solutions

2019 Nissan Altima Key System Error
Attempting to start the 2019 Nissan Altima, the ‘Key System Error’ message suggests a key-related problem.

Problem 1: Dead Battery

A dead or weak key fob battery is one of the major causes of communication issues between the vehicle and the key fob. Due to the lack of power, it may interfere with signal transmission, and you may experience key system errors.


Dead Key Fob Battery
Replacing the Nissan Altima key fob battery with a screwdriver in hand to resolve dead key fob issues.
  • First, take a small flat-head screwdriver and gently open the key fob.
  • Then, take out its battery and inspect it physically to ensure it is not damaged.
  • Take a replacement battery, and make sure you have purchased the specific battery for your Nissan key fob. I recommend the Duracell CR2032 3V Lithium Battery for the Nissan key fob. However, it is better to consult the user manual.
  • Now, insert the new battery and close the key fob.
  • Lock the car doors, stay away from the car, and test its functions to ensure it works fine.

Problem 2: Faulty Key Fob

Another potential cause for a key system error on your 2019 Nissan Altima is here. A warning light may appear on your screen if a faulty key fob fails to receive signals. It happens when you replace key fob parts with generic ones without consulting the user manual.


  • A key fob issue can only be solved by replacing it.
  • First, try to replace the batteries because the battery may be the cause
  • However, if the battery is fine, then you may need to invest in the key fob
  • Consult the user manual to find the best one for your Nissan Altima. If you do not have the manual, I recommend Dorman 99131 Key fob, which is compatible with all Nissan models. 
  • Once you get the replacement, test and ensure it is compatible

Problem 3: Faulty Antennas

The antenna receives signals and ensures an interference-free transmission between the key fob and the system. But if it damages itself or has other issues, you may fail to perform functions properly.


  • Check for the antenna and make sure it is fine
  • Ensure there is no physical damage
  • If it is faulty, you will need a replacement
  • Make sure you have taken the right one. I recommend the Dorman 76016 Antenna for the 2019 Nissan Altima.
  • Once you have replaced the Antenna, test its functions and ensure the issue is removed.

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Problem 4: Software Glitches

You will need an up to date software for the proper functioning of the Nissan Altima key system. If there is an issue, such as outdated software or drivers, you may be unable to execute the functions.


  • Check for the software update.
  • If there is an update for the software, update it to access the functions
  • It is also essential to check the drivers and ensure they are up to date
  • Additionally, update the drivers if necessary.
  • Once you have updated software and drivers, test the functions and ensure they are executing properly.

Nissan Altima Key System Error Reset 

Most of the time, key system errors occur due to incorrect startup or closing. This issue can be easily removed by resetting the Key system if it happens. Before jumping to any solution, try resetting the key system for quick troubleshooting.

Resetting the Nissan Altima Key system is simple; follow the steps below to reset it.

  • First, lock your Nissan Altima doors; it is a must; otherwise, you cannot execute the function.
  • Now, insert the key into the ignition system and immediately remove it. Continue doing this for 4 to 5 times.
  • It will activate the program mode; insert the key and turn it on once activated. 
  • Then press the button on the intelligent key
  • Now that the system has been reset,
  • Test to ensure it is working fine. Stand away from your Nissan Altima and check the fob. The program is successfully reset if the lights flash or the car beeps.

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When To Seek Professional Help?

It is good news that you can fix the system key error issue most of the time. However, if you have implemented all troubleshooting efforts but the issue still exists, it is better to seek assistance from a professional Nissan technician. 

Certified technicians have the experience and expertise to quickly diagnose and fix the issue permanently to ensure a smooth driving experience.

Frequently Asked Questions (FAQs):

Can I drive my Nissan Altima if there is a Key System Error?

You can drive your Nissan Altima even with a key system error. However, it may cause issues when you start or unlock your car via a keyless entry system. So, fixing it to ensure a smooth start and locking mechanism immediately is better.

Will resetting the key system can fix this error?

Yes, it can fix the issue, but it is not necessary because you may have other problems that need proper fixation. However, it is good to try resetting before any other solution to save time and money. If it does not work, save time and go for professional solutions.

How can I reduce Nissan Key System error chances in the future?

If you want to avoid key system errors in the future, ensure your battery is okay. Make it a habit to check the battery. Also, ensure that the key fob is clean and dry to prevent physical damage. 

Avoid interference to minimize the risks, and regularly service your car. If it needs replacement, replace it with the original parts. Also, check for the software and ensure drivers and software are current.

How often should I replace the battery in my key fob?

There is no exact answer to that question because the battery can be damaged sooner or later due to different factors. However, on average, a battery can last for between 1-2 years. You must check and ensure the battery is fine; otherwise, replace it with a good-quality battery to ensure a smooth power supply.

Can I use a generic key fob as a replacement?

Yes, you can use the generic key fob as a replacement. However, if you have replaced it with a low-quality generic key fob, you might be at risk. So, replacing the Nissan key fob with an original one is always better to ensure optimal performance.


Key system errors on the 2019 Nissan Altima can be frustrating; however, do not worry because they are common. You can fix them easily without spending a lot. However, it is essential to properly diagnose the cause and then fix it following the above steps. If you fail to overcome the problem after multiple tries, then it is recommended that you seek professional help to find a permanent solution.

Drive error-free, Drive confidently!

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