Key System Error Nissan Altima 2019

Noticing key system error message on Nissan Altima 2019’s display is a concerning issue as it can prevent the car from recognizing the key fob, and disturb the car’s performance. It can also prevent the car from starting the engine.

The display message key system error Nissan Altima 2019 may occur due to a dead battery, faulty intelligent power distribution module, intelligent key fob, or BCM.

Though replacing the battery or reprogramming the software should deactivate this warning message, you may need to visit Nissan’s service point for deep diagnosing.

What Does Key System Error Mean On Nissan Altima 2019?

After pushing the ignition switch to the ON position, your Nissan Altima may turn on the key system error light for a certain period and then turn it off. This error message indicates a faulty intelligent key system and appears if your vehicle struggles to recognize the key fob and can’t communicate with the immobilizer system.

The sign of a faulty intelligent key system is that the warning light will illuminates in yellow while pressing the ignition switch. If this warning light activates when the engine stopped, you won’t be able to start the engine. However, you can lock and unlock the vehicle with this error message.

But if the light comes on when the engine is running, you can keep driving the car. To make driving safer, check the system with an expert mechanic or visit Nissan’s service center.

How To Fix Key System Error Nissan Altima 2019

Below are some most common causes of key system error on Nissan Altima along with simple solutions:

Intelligent Power Distribution Module

If you determine that your car with key system error massage due to a damaged Intelligent Power Distribution Module, you’ll have to replace it to solve the issue.

Intelligent Power Distribution Module

To complete the repair successfully, you must follow the whole service procedure closely that is described in the user manual. However, Nissan recommends hiring a qualified technician to handle this job instead of doing it yourself.

The steps for replacing the Intelligent Power Distribution Module (IPDM E/R) are:

Electronic & Power Control > Power Control Management > IPDM E/R > Remove and Install

Damaged Key Fob Battery

If your Nissan Altima 2019 shows a key system error massage, the first thing you should check is the battery in the key fob. The key fob’s battery may fail over time particularly if used more often.

Damaged Key Fob Battery

However, it’s quite simple to replace the Nissan’s key fob’s battery and it’s commonly available. You may also need to replace the key fob’s battery every 3 to 5 years. Follow this procedure to replace the battery on your Nissan key fob:

  • Turn over the key fob and push down the small switch found on the rear side of the fob. This way you’ll remove the key from the key fob.
  • Separate the cases using a screwdriver and keep both front and rear cases in a cloth.
  • Open the slots to reveal the battery and push it using a screwdriver so it comes out.
  • Then insert a new battery and close the cases. Put back the key and push the button to check its performance.

Faulty Intelligent Nissan Key Fob

If the key system error massage on Nissan Altima 2019 doesn’t disappear after replacing the key fob battery, try to reprogram the key to restore its functionality. The key fob of the Nissan vehicle may also malfunction due to software issues.

Faulty Intelligent Nissan Key fob

So resetting the system should work. The best way to reset the Nissan’s key fob is to bring it to the Nissan dealership even if it cost around $100 to $200. However, you can reset the Nissan Altima key system error at home garage.

Faults in the BCM

If your Nissan Altima still shows a key system error message after replacing the key fob battery or the main battery or resetting the computer, check the BCM system. Sometimes the issue on the BCM wiring can activate the key system error light on Nissan Altima’s dashboard. If so, replacing the BCM wiring may fix the issue and deactivate the error light.

Faults in the BCM

If your car still shows the key system error message, bring it to the Nissan dealership or nearest auto repair shop. Your Nissan Altima may have other issues like a damaged ignition switch, faulty battery connection, or bad starter motor that require deep diagnosing.

How To Reset Key System Error Nissan Altima 2019

  • First of all, lock the car’s door.
  • Insert and take out the key from the ignition a couple of times. Doing this will activate the program mode.
  • Then put the key into the ignition and rotate it. Press the intelligent key button.
  • Now check the key fob. If your Nissan Altima car starts flashing lights or makes beeps, the key is reprogrammed properly.
Nissan Altima key system error resetting Process


Why won’t my Nissan Altima recognize the key?

If the battery of your Nissan Altima’s key is low or almost dead, the vehicle won’t recognize the key. If the car still doesn’t recognize the key after changing the battery, check the IPDM or intelligent key fob. If you are confused, reach out to the manufacturer’s service point.

How to start a Nissan Altima without the smart key?

If your Nissan Altima’s smart key doesn’t work, use the key fob port to start the vehicle. Insert the fob into the port and tap the clutch or brake pedal. You can also step on the clutch or brake to start the vehicle.

Why is my Nissan key fob not working after the battery change?

If your Nissan’s key fob won’t work after replacing the battery, reset the key fob to restore its functionality. You should also look for misalignment buttons or broken contacts as these can prevent the key fob from working properly.

Final Words

The Nissan Altima 2019 mostly shows key system error massage due to a bad or dead battery. So replacing the battery should disappear this error message. Even you should now be able to replace the key fob’s battery easily at home as you’ve got the procedure.

But if your Nissan Altima 2019 still shows the warning light, bring it to the service point for deep analysis. 

My name is Tom Vanderbilt. I am an automotive expert and renowned for my profound knowledge of automobiles. I have made significant contributions to the industry through my experience and expertise. I have a natural curiosity and fascination for cars. My journey is to explore the intricate dynamics between people, their vehicles, and the ever-evolving transportation landscape.

2 thoughts on “Key System Error Nissan Altima 2019”

  1. Great solution! I’m glad to hear that the issue with the Nissan Altima’s key system is not just isolated to my car. I’ve been experiencing the same problem and it’s been super frustrating. I hope Nissan addresses this issue soon. Thanks for sharing your experience!

  2. Thanks for sharing solutions. I was experiencing key system error with my 2019 Nissan Altima. It was quite frustrating as it happened suddenly and I wasn’t sure what was causing it. Solved the key system error.


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