Although Nissan USA's 214-596-4000 phone number is an official contact point, it doesn't work properly unless you happen to know someone at the company. When you call this number, you're greeted with a confirmation message that you've reached Nissan of America, and you're then presented with two options.
If you know your party's extension number, you can press 2 and be taken to the menu where you enter their information. If you're simply calling Nissan, the system tells you to press 1 to go to the automated system.
Unfortunately, that's where things go off the rails, because the transfer to the automated system doesn't work as intended. When you hit the button to be transferred to the automated system, the system automatically hangs up, even though it's telling you that it's transferring you to the appropriate number. After I hit 1, the number gave me a standard, "Please wait while your call is transferred," and I immediately heard the dial tone confirming that the system had hung up.
I checked to make sure that I hadn't accidentally hit the wrong button, which I had not. I then called back to see if it had been a mistake, and the system again hung up on me. With no real options left, I was forced to leave the call there.
When researching this number, the main result that popped up was Nissan's debt collections, so it really doesn't seem as if this number is meant for customer service. It appears the only people who would call this number are people who already have an issue with Nissan's billing and would be calling someone specific.
However, that's no excuse for having a number transfer system that doesn't work properly. If Nissan doesn't want people using this number to call for customer service, it shouldn't even offer a connection to the automated system as an option. Instead, Nissan could provide the correct number for customers to call if they have reached this number for whatever reason.
Other than that issue, the number seems to work well for its purposes. When you consider most people using this number will have a specific reason for calling, the number's setup makes sense. However, I can't properly judge the customer service provided by using this number, as it's designed to connect certain customers to a specific person who can help them.
Obviously, I don't recommend using this number unless Nissan has provided it to you and told you to use it. Unless you need to reach someone specific and know their extension, this number will be of no help to you.