1. Low transmission fluid level: Check the transmission fluid level and add more if necessary.
2. Faulty shift linkage: Inspect the shift linkage for any damage or loose connections. Tighten any loose bolts or replace damaged components.
3. Faulty transmission control module (TCM): The TCM is responsible for controlling the transmission. A faulty TCM can cause transmission problems, including the inability to engage drive. Have the TCM tested and replaced if necessary.
4. Faulty transmission solenoid: A faulty transmission solenoid can prevent the transmission from engaging drive. Have the solenoids tested and replaced if necessary.
5. Internal transmission problems: If the above solutions do not resolve the problem, the transmission may have internal problems, such as worn or damaged gears. This will require professional transmission repair.
