Why can't the automatic transmission shift into P gear?

[KalebFitz]

It may be caused by damaged gear teeth preventing the shift into P gear. Below is a detailed analysis of the specific reasons for the inability to shift into P gear: 1. No antifreeze added. Some car owners add water or low-quality antifreeze to their cars, resulting in the entire water circuit freezing in extremely cold winter conditions, causing the engine to crack, the car's water pump to fail to operate, the engine not to start, and damage to other engine components. 2. P gear lock solenoid valve failure; For safety reasons, to prevent the vehicle from accidentally shifting into other gears when starting, there is this P gear solenoid valve, which needs to receive a signal from the brake pedal to release. Therefore, these two components are related, and if either one fails, it will prevent the gear lever from being pushed out of P gear into other gears. 3. Internal failure of the gear lever assembly, where the internal gears of the gear lever are worn, causing the gear lever to jam, making it difficult to pull back and forth, resulting in the inability to shift gears or difficulty in shifting.