No, you cannot and should not lock your car doors using the power door lock switch or key fob while the vehicle is in Drive (D). Modern vehicles have a built-in safety feature that automatically prevents the doors from locking when the transmission is in any driving gear. This is a critical design to prevent occupants, especially children, from being accidentally locked inside a moving vehicle. If you hear a clicking sound but the doors don't lock, that's this safety system in action.
The primary reason this feature exists is to ensure an exit path in an emergency. For instance, if you were involved in an accident and the electronic systems failed, first responders or you yourself need to be able to open the doors from the inside to get out. The mechanism works by prioritizing the transmission's gear signal over the lock command. However, you can usually lock the doors manually using the individual manual lock knobs on each door, though this is not recommended while driving.
If your car does allow locking in drive, it might indicate a malfunction or that the vehicle is an older model without this standard safety protocol. The safest practice is to come to a complete stop, shift into Park (P), and then lock the doors before exiting. The following table outlines the typical behavior of door locks based on transmission gear for most modern vehicles:
| Transmission Gear | Door Lock Switch / Key Fob | Manual Lock Knob | Typical Behavior |
|---|
| Park (P) | Activated | Engaged | Doors will lock normally. |
| Neutral (N) | Activated | Engaged | Doors may or may not lock (model-dependent). |
| Reverse (R) | Activated | Engaged | Doors will NOT lock electronically. |
| Drive (D) | Activated | Engaged | Doors will NOT lock electronically. |
