In most GM vehicles it is below the steering column and to the left.
with key in the "acc" position hit the "set" button and then hit the "scan" button for hours and the "seek" button for minutes
Not entirely sure what you mean by this but assuming you mean a brute force port scan. Answer is no, you can scan a port directly, no need to scan every port on a system (brute force).
Im going to assume the code you have given is PO740 on the obd2 scan tool? PO740 is a TCC circuit malfunction
TCP port 25 is usually used by SMTP servers (for sending e-mails).
The scan port is usually located under the dash, near the steering column. It may be visible, or behind a small cover that can be removed.
Obd-on board diagnostic. The port is the plug the scan tool or code reader connects to.
A precursor
Port Scan
You will need a OBD2 scan tool to reset the light after repairing the problem that caused the fault code. If you do not repair the problem the light will just come back on.
A precursor
In linux, issue the following command in the terminal.lsof -i TCP | fgrep LISTENOrdo a port scan using a port scanner like nmapex: nmap In Windows, you can do a port scan to get the list of open ports in your computer. For this use, nmap or zenmap (gui of nmap). There could be other ways but this is the one I have experience on.
With an OBD2 scan tool plugged into the port.