Experiencing issues with your 2019 Nissan Altima key fob after a battery replacement can be frustrating. Many Nissan Altima owners encounter problems like “Invalid Key ID” messages or unresponsive key fob buttons after attempting a simple battery swap. Fortunately, these common issues often have straightforward solutions that you can perform yourself, saving time and money compared to a dealership visit for a 2019 Nissan Altima Key Fob Replacement or reprogramming. This guide will walk you through troubleshooting two prevalent key fob problems and provide step-by-step solutions to get your 2019 Altima key fob functioning correctly again.
One frequent problem arises immediately after replacing the key fob battery in your 2019 Nissan Altima. You might find that while the remote door lock/unlock buttons still work, the car displays an “Invalid Key ID” or “No Key Detected” message. Furthermore, the door request buttons on your vehicle may become unresponsive. However, you can usually still start your 2019 Nissan Altima by pressing the start button directly with the key fob, or by using the emergency key fob receptacle if your model has one.
Solution for “Invalid Key ID” or “No Key Detected” after Battery Replacement:
This issue typically occurs because the key fob needs to be resynchronized with your 2019 Nissan Altima after a battery change. Here’s how to resolve it:
- Begin by removing the backup door key from your 2019 Nissan Altima key fob.
- Enter your Nissan Altima, ensuring you have the key fob with you inside the vehicle.
- Press the start button twice without pressing the brake pedal. This will cycle the ignition to the “ON” position without starting the engine.
- Exit the car, leaving the key fob inside the vehicle. Make sure to take the backup door key with you.
- Close the driver’s side door.
- Insert the backup door key into the driver’s side door lock.
- Turn the key to the left (counter-clockwise) to lock the door. You should hear the door locking mechanism engage.
- Immediately turn the key to the right (clockwise) to unlock the door. Again, listen for the unlocking mechanism.
- Remove the door key and re-enter your 2019 Nissan Altima.
- Press the start button one more time (without pressing the brake) to turn the ignition to the “OFF” mode.
After completing these steps, the “Invalid Key ID” messages should disappear, and all key fob functions related to vehicle detection should return to normal.
Another common issue with the 2019 Nissan Altima key fob is the reverse of the first problem. In this scenario, everything seems to work fine – the car detects the key, starts normally, and you don’t get any error messages. However, none of the push-button functions on the key fob itself operate. This means the remote door lock/unlock, panic button, remote trunk release, and remote start (if equipped on your 2019 Nissan Altima) are all unresponsive.
Solution for Unresponsive Key Fob Buttons (Remote Lock/Unlock, Panic, Trunk, Remote Start):
This problem usually indicates that the key fob’s remote functions need to be re-established with the car’s computer system. A simple ECU reboot with the key fob present in the vehicle can often resolve this. Here’s the process:
- Ensure your 2019 Nissan Altima key fob is inside the vehicle.
- Locate the car battery under the hood of your Nissan Altima.
- Disconnect the negative (black) battery cable from the battery terminal.
- Wait for a minute or two. This allows the ECU (Engine Control Unit), the car’s main computer, to fully discharge and reset.
- Reconnect the negative battery cable to the battery terminal. Ensure it is securely tightened.
Disconnecting the car battery performs a “cold boot” of the ECU. When the ECU restarts with the key fob inside the car, it re-establishes the push-button functionalities of the key fob. Be aware that disconnecting the battery may reset the ECU’s learned settings, potentially causing a slightly different engine idle for the first few miles of driving. This is normal and will quickly correct itself as the ECU relearns.
Important Considerations for 2019 Nissan Altima Key Fob Battery Replacement:
Replacing the battery in your 2019 Nissan Altima key fob before you encounter intermittent issues can often prevent the need for these reprogramming procedures. However, if the battery voltage in your key fob becomes very low, the internal memory can sometimes become corrupted. In such cases, simply replacing the battery might not restore full functionality, and one of the procedures outlined above will be necessary.
The correct replacement battery for your 2019 Nissan Altima key fob is a CR2032 button cell battery. While a CR2025 battery (which is slightly thinner) can work in an emergency, it has a lower capacity and will not last as long as the CR2032. For optimal performance and longevity of your 2019 Nissan Altima key fob, always use a CR2032 battery for replacement.
Reprogramming Multiple Key Fobs:
If you have two key fobs for your 2019 Nissan Altima, both can potentially be reprogrammed simultaneously using either of the procedures described above. Simply leave both key fobs inside the car when performing either the door lock/unlock sequence or the battery disconnect ECU reboot. While not personally verified for both at once, reports suggest this method should be effective for reprogramming multiple 2019 Nissan Altima key fobs.
By following these troubleshooting steps, you can often resolve common 2019 Nissan Altima key fob issues after a battery replacement without needing to seek professional 2019 nissan altima key fob replacement services or incur unnecessary costs.
