There are some number of reasons which can be source of a car engine problem P2331 Code and it is not to begin, the most common, certainly, actuality a dead battery. You should pay superior care to the noise what starts from the car engine and it creates when you turn the key. Check the car is completely silent or not? If so, there may be a faulty with your battery terminal wire connections. Then it may be your spark plugs or fuel source to your engine. In any case, if you are out on the road, try kickstarting your car then examining the cause further when you are securely back at home.