From reading the service manual it doesn't look like it will immediately throw a code but there is a DTC code associated with it. It says the code is triggered when the computer doesn't receive the proper voltage or capacitance when the solenoid is suppose to actuate. I'm guessing if it is not causing a check engine light to come on that perhaps it throws a code in the background that will cause you not to pass emissions.
I would like to know for sure before unplugging it. After reviewing the system diagram and reading the service manual I am not so sure unplugging it is the best thing.
2011 Mustang GT Premium, Brembo Package, 3.73, Manual, Black, C&L Racer Intake w/ Bama Perf tune