In hybrid vehicles, both electric motors and heat engines are used. In the case of electric motors, they require a high voltage which is provided by a high-voltage battery known as a traction battery. This is made up of 28 modules that individually contain 6 cells of 1.2 volts. The connection of the cells is carried out in such a way that a series is formed, which guarantees 201.5 volts.
When the P3015 OBDII fault code is stored, it means that a voltage or internal resistance was detected in block number 5 of the hybrid battery, which has inconsistencies and is interpreted as an erratic operation.