The vehicle’s charging system is responsible for maintaining the charge and sending the necessary electrical power to all components and sectors of the car. Its components are the battery, an alternator, the cable system, and a control module. There are vehicle models that have a regulator.
The alternator converts the mechanical energy of the vehicle’s crankshaft into electrical energy so that the different components of the vehicle that need it can perform their work. Likewise, the battery is recharged with the energy from the alternator.
The diagnostic code P2503 OBD2 indicates that the PCM (Powertrain Control Module) found that the voltage produced by the charging system is not sufficient to charge the batter