Service A/C light

The control module has shut the system down because it has recognized a problem, usually fast cycling that is sometimes cause by low refrigerant. You can reset the module temporarily by disconnecting the battery for testing purposes but don't try to continue to use it that way. It shut itself down to prevent damage.

There are many, many variables involving the pressures. You really need to understand how A/C works to recognize what's correct and what isn't. With outside temp over 70degrees and on high blower, you should be seeing something between 30 and 40 on the low side and 175 to 250 on the high side but that's not a rule by any means. The best thing to do is have it completely evacuated and recharged with the exact charge it should have. That is the ONLY way to ever know if it has the right charge in it or not.

And what did the shop determine when you brought it to them to have the codes scanned and the system diagnosed?

That is your next step so let us know when you do.