Your Nissan Altima doesn’t start anymore and you know it’s because of your immobilizer but you don’t know exactly how it works or how to find it? We will try to provide you with an answer in this article.
First of all, we will describe what this famous immobilizer is for and how it works on your Nissan Altima.find-anti-start-code-nissan-altima

Anti-start utility on your Nissan Altima:

This one is of course used as an anti-theft protection. Indeed, it is programmed in order to start your Nissan Altima only if the key which includes this code is inserted. We remember these films where thieves adjust a few wires under the dashboard to start the engine, which is impossible with the anti-start system.

Anti-start operation on your Nissan Altima:

To put it simply, we have a transmitter and a receiver that work together to validate the operation and as a result switch on the engine. The immobilizer provides the transmitter, and will consequently issue a code request when the key is inserted in your Nissan Altima. Consider this transmitter as a doorkeeper who would ask for an entry code when someone knocked at the door.
This code request is provided to the key, which in turn, sends a unique user code, specific to the start system, and in the event this code matches, then the anti-start will let the engine start.
The operation is very simple. However, when mentionning double safety, we also suggest potentially more possibilities of breakdowns or various failures unfortunately.
In the next paragraph, you will find the various breakdowns you could deal with on your Nissan Altima.

Immobilizer failures:

There may be various motives that prevent your Nissan Altima from starting because of the immobilizer. First of all, stupidly, you’re not using the right key. It may seem superficial but it happens!
If you have the right key, you have two options left:

  • Option n1: The transmitter is involved, so the immobilizer. Usually, it is easy to identify if you have a duplicate key. If, with the two keys of your Nissan Altima, you have the same difficulty, then it is the anti-start that is flawed and therefore must be replaced or disabled. Doing so will cost less than replacing it, but your car will be more subjected to to theft and your insurance may not cover you if your car is stolen.
  • Option n2: The difficulty comes from the receiver, the key, which transponder has been broken. This can be changed for less money by a professional than the anti-start system.

If you speak to your mechanic, he will obviously offer to tow your Nissan Altima and charge a high price for everything, he will not give you the code easily. For security reasons alone, it is legally impossible to transmit the code to you. You must send your car.


  • – First try to identify where the failure on your Nissan Altima came from. Then act accordingly. It would be a shame to replace the entire immobilizer system when the key is defective.
  • – Make a quote at a garage and then consider an replacement at an online professional, which will often be more efficient and less expensive.

If you need more guides on the Nissan Altima, go to our Nissan Altima category.