The B1374 Code appears for the error of engine. The meaning of code and problem of the engine can be different based on the manufacturer and model of the car. Overheating can be a reason by a few unlike factors. The modest reason may be that your car wants more coolant. Yet tired coolant can be produced by bigger tricky, like leaks or defective hoses, so always verify for the original cause before only satisfying it up with more. Another common cause for warmness may be that the radiator fan which saves your engine by cooling is defective, so you should check your fan motor joining and fan thermostat.