Why can't the transmission release from P gear?

[Anderson]

The reasons why the transmission cannot release from P gear: 1. It may be due to the anti-theft lock or the transmission operating mechanism being stuck. 2. It could also be caused by a damaged or stuck shift solenoid valve in the transmission. Below are some precautions regarding the transmission: 1. To shift to other gears, you need to start the vehicle first and then shift into other gears; or press the brake pedal before switching gears. When parking, always ensure the vehicle is completely stopped before shifting into P gear, otherwise, it is easy to encounter this situation where the P gear cannot be released. 2. With the advancement of technology, transmissions have evolved from manual operation to automatic shifting. 3. How the automatic P gear works: When the gear lever is in P gear, the parking lock mechanism locks the transmission output shaft. In P gear, the drive shaft is partially locked inside the transmission, so even without pressing the brake on flat ground, the vehicle has a certain braking force.

[MacMila]

I encountered this exact situation while repairing a car today. The owner was frantic, saying the car was stuck in Park and wouldn't move. Actually, the most common cause is when the brake signal fails to reach the transmission - this could be due to poor contact or complete failure of the switch under the brake pedal. You can check this by observing whether the taillights illuminate when pressing the brake. Another possibility is a faulty shift lock solenoid under the gear lever, which is responsible for releasing the Park lock. Electrical issues shouldn't be overlooked either, especially in older vehicles with aging wiring - blown fuses or the transmission control unit not receiving signals can also cause this. I've also seen cases where the gear position sensor malfunctioned, making the car think it's still in another gear. If this happens, never force the gear lever - try restarting first, and if that doesn't work, call a tow truck for professional diagnosis at a specialized shop.

[DakotaFitz]

Last week, I thoroughly researched this issue after encountering it. Most cases of being unable to disengage from Park (P) mode are related to the electronic control system, especially the electronically controlled gearshift mechanism in modern vehicles. First, check the position sensor under the brake pedal—if it's faulty or misaligned, the computer won't receive the unlock signal. Next, verify whether the battery voltage is sufficient, as many vehicles will lock the transmission protection system when voltage is low. Another easily overlooked scenario is when the ignition key isn’t fully turned to the ACC position, preventing the vehicle from receiving full power. I recommend first trying to press the brake pedal firmly a few times to observe the response, then restart the engine and attempt to shift after turning off all electrical devices. If none of these work, check if the emergency release hole under the gear lever can resolve the issue.

[Verona]

Last year, I dealt with three cars that couldn't shift gears. Aside from the common brake switch issues, there were quite a few mechanical failures. For example, stuck shift cables, excessive impurities in transmission fluid, or the parking pawl getting jammed due to tires pressing against the curb when parked. In such cases, first check if the handbrake is fully engaged. On level ground, gently rocking the car can release the pressure. Additionally, high transmission fluid viscosity in winter might temporarily lock the gear. If you're attempting a DIY fix, you can pry open the gear lever dust cover to find the emergency release hole. Using a key to press against it can force an unlock—the exact location is specified in the owner's manual.