1. Shifter Linkage Problem:
- Check the shifter linkage under the vehicle for any visible damage, such as bent or disconnected components.
- Make sure the linkage is properly connected to the transmission.
2. Transmission Fluid Level:
- Ensure that the transmission fluid is at the proper level.
- If the fluid is low, add the appropriate transmission fluid as specified in your owner's manual.
3. Transmission Gear Selector Switch:
- The gear selector switch may be faulty, preventing the transmission from engaging in reverse.
- Check the switch for damage or loose connections.
4. Transmission Problem:
- There might be an internal issue within the transmission itself, such as a broken gear or synchronizer.
- This would require a more thorough inspection and possibly repair by a qualified mechanic.
5. Grinding Noise:
- The grinding noise could be an indication of transmission problems, such as worn gears or synchronizers.
- It is important to have this checked by a professional to identify the root cause and prevent further damage.
If you are unable to resolve the issue independently, it's best to consult with a qualified mechanic who can accurately diagnose and fix the problem to ensure safe operation of your vehicle.