18 Buick Hideo 1.0T idle speed is high. Is it normal to generate around 15.2V?

When the vehicle is idling, it is normal to generate about 13V, because the generator speed is low and the output current is correspondingly small, so the power generation will not be too high. When blowing oil, the rotating speed and output current of the generator will increase, so it is normal to generate about15.2vv.

If the vehicle generates too much electricity when idling, it may cause damage to electrical equipment and batteries, so it is necessary to check the problem and deal with it in time. Fault codes are helpful in diagnosing problems. You can read the fault code through a professional automobile diagnostic instrument to further understand the problems existing in the vehicle. If the generator fails, it may need to be replaced to ensure the normal operation of the vehicle.

In addition, you mentioned the new battery, which is a good practice. When the output current of the on-board generator is large, the battery needs to bear more charge. If the battery is aged or damaged, it may cause the vehicle to fail to start normally or other problems. Therefore, it is an important measure to check the battery status regularly and replace it in time to maintain the vehicle electrical system.

Finally, when the vehicle is engaged in the N gear, the engine speed will decrease, which is also a normal phenomenon, because there is no load on the engine at this time, and the output current of the generator will also decrease accordingly.