There are several number of causes which can motive a car engine not to initiate. The problem P2174 Code may have started for any cause of the car engine. The most mutual cause of the problem is being a dead battery. You need to give special care to the sound what makes when you turn the engine key. If so, there may be a trouble with your battery terminal wire connections. Does your car original over but not start? Then it may be your stimulus plugs or fuel source to the car engine. If you are out on the road, try starting your car then inspecting the reason further when you are securely back at home.