What is the reason why the Benben M gear is normal but the D gear cannot shift up?

[LaDaisy]

The reason why the Changan New Benben automatic transmission sometimes cannot engage is that the gear lock is locked or it is in P gear. Engaging P gear: When driving, shifting from P gear to other gears, Japanese cars generally require pressing the shift lock switch, while German cars generally require stepping on the brake. The P gear also has the function of a handbrake; it will not roll back on slopes below 15 degrees, but on steeper slopes, the handbrake must be applied. Checking the brake: You can try unlocking the gear lock with the key. If it still doesn’t work, then check whether the brake lights come on when you step on the brake. If the brake lights do not come on, the brake switch is damaged. The car computer cannot detect whether the brake is pressed, so the gear cannot be engaged. The brake switch is located below the brake pedal and can be replaced by yourself.