Will low coolant throw a code? check this out | can low coolant cause check engine light
Will Low Coolant Throw A Code? It is possible for the code to be triggered by anything from a low coolant level to a faulty thermostat, so you should do your research. When you replace the thermostat, make sure you know how to properly refill the cooling system before you even begin.
A low coolant level in the radiator of your car can cause the malfunction illumination light (MIL), also known as the “check engine” light, to appear.