2005 Nissan Xterra P1762 P1754 P1772 Codes

The codes you indicated actually have nothing to do with the problem your Xterra is experiencing. The problem is with the electronic feed to the dash panel’s combination meter. This electronic device handles the varied outputs you see when you turn the ignition switch. Believe it or not, though there are many circuits involved, there is one control module that runs the whole thing. It is a 40-pin header that includes, among other things, the displays for your fuel, coolant temperature, automatic transmission status and the like.

While the problem you are experiencing may seem transmission-related, it is more correctly an electronic problem with the display control module. From looking over the schematics, it looks to be line 20 of the 40-pin device that controls the fate of your transmission status display.

You will need some specialized test equipment to check out any problem with this module. At the very least, you will need a good volt-ohmmeter to test the voltage levels that are required, if you feel you are qualified to handle the chore. It is rather tedious, to be honest, and requires constantly checking to see the exact voltage values. They are also easy to miss.

You will need someone expert in working with this type of equipment to handle everything. The good news is that it is unlikely to keep you grounded because, as far as I can determine, there is no linkage between that module and the other key modules of the automatic transmission circuit.