Q: Check engine light P0113 after replacing thermostat housing

After filling my coolant tank a few times it was clear that I had a leak. It was obviously an external leak from the stains appearing underneath my truck. I checked to find the origin and found that it was coming from the thermostat housing. I decided that I would replace the housing. I did replace the housing. Following my little repair job, I turned on the engine and found that my check engine light came on, so I checked the code. The code is P0113 which for the Ford is "[a] diagnostic trouble code (DTC) [that] is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. . . When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code." This troubles me seeing that I just replaced this part. I cleared the code, so I will drive it tomorrow and see if the light appears again. I shook the new housing before putting it in and it rattled, and this had me worried that it could be faulty. Is this possible?
My car has an automatic transmission.