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Why Can't an Automatic Transmission Suddenly Shift Gears?

2 Answers

DiEvelyn

09/05/25 3:33am

Automatic transmission suddenly unable to shift gears due to: 1. Internal failure of the gear shift assembly preventing gear engagement; 2. Malfunction of the internal control module in the transmission; 3. Fault in the transmission's gear position switch. The P-lock mechanism of the transmission consists of a lock gear, a locking pin, and a set of action mechanisms. When the gear lever is moved to the P position, the cable drives the connecting ball pin, causing the working pin to slide and engage the lock with the parking gear, thereby achieving parking lock. If the car is not fully stopped before shifting into P gear, the inertia of the car will cause it to lurch forward, concentrating force between the lock block and the gear, which can easily lead to this kind of jamming.

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MacAdaline

09/17/25 4:12am

I once encountered this situation too, sweating profusely in panic. The most common reason for an automatic transmission not engaging is that the brake signal isn't being transmitted, meaning the brake switch is faulty or has poor contact. That little component is responsible for telling the transmission you've pressed the brake pedal - if it's not working, the gear lever gets locked. Another possibility is a stuck shift lock solenoid valve; in this case, you might hear a faint click when pressing the brake in a quiet place. Also, a locked steering wheel can simultaneously lock the gear shift - try turning the steering wheel left and right while pushing the gear lever. Too low battery voltage can also make the control system stop working, something older cars need to be particularly careful about. If all else fails, don't force it - calling a tow truck is the safest option.

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