Replacing a fuse might be a good *first step* in troubleshooting, as it's easy and inexpensive. However, if the fuse is fine, you'll need to investigate further. This could involve:
* Checking the bulb: Access the instrument cluster and visually inspect the bulb. It might be burnt out.
* Checking the wiring: Look for any broken or loose wires connecting to the bulb or the gear selector switch.
* Testing the gear selector switch: This switch sends the signal to illuminate the "D" light. A multimeter might be needed to test its function.
* Instrument cluster issues: Rarely, a problem with the instrument cluster itself (e.g., a faulty circuit board) could prevent the light from working.
In short: While a blown fuse is a possibility, it's not the guaranteed fix. A more thorough diagnosis is needed to pinpoint the actual cause.