What is the reason for the Sonata 9 not moving when shifted into reverse gear?

[LaJackson]

Sonata 9 not moving when shifted into reverse gear is due to a faulty gear position sensor. Below is an introduction to the gear position sensor: 1. Working Principle: The gear position sensor, also known as the gear switch sensor, is used to detect gear signals. The gear position sensor has multiple contacts. When the car shifts gears, the contacts move to the corresponding gear position, changing the voltage value. The gear position sensor detects the gear shift signal and transmits it to the transmission computer, thereby controlling the corresponding actuators to operate. 2. Symptoms of Failure: When the gear position sensor fails, the car's dashboard may not display the correct gear position, the vehicle may fail to start, the car may not shift gears normally with jerky upshifts and downshifts, and the car may also experience weak acceleration accompanied by shaking.