Why is my Smart car having trouble selecting gear?

It could be one of several things: 1. Check the rear lights to see if the brake lights are working; if not then it’s probably the brake light switch which is faulty and needs replacing. (On a 450 it’s between the under tray and the car chassis and it helps to have the car on a ramp. On a 452 or 454 it’s under the brake pedal in the foot well.) 2. Then the wiring to the gear selector motor needs to be checked to see if there is damage to the wiring causing electrical short circuits 3. Check the clutch actuator adjustment and operation 4. The clutch unit may be worn and need replacing, always replace the release bearing at the same time