Potential Causes:
* Low transmission fluid: Check the transmission fluid level. If it is low, add the correct type of fluid to the transmission.
* Dirty transmission fluid: Old or dirty transmission fluid can cause the transmission to shift hard. Change the transmission fluid and filter.
* Faulty shift solenoid: A faulty shift solenoid can prevent the transmission from shifting smoothly. Have the shift solenoids tested and replaced if necessary.
* Faulty torque converter: A damaged or worn-out torque converter can cause the transmission to shift hard. Check the torque converter and replace it if necessary.
* Internal transmission problems: If none of the above issues are present, the problem could be internal transmission damage. You may need to have the transmission rebuilt or replaced.
Recommended Solution:
* If the transmission fluid level is low or dirty, add the correct type of fluid to the transmission or change the transmission fluid and filter.
* Have the shift solenoids tested and replaced if necessary.
* Have the torque converter checked and replaced if necessary.
* If internal transmission problems are present, you will likely need to have the transmission rebuilt or replaced.
Additional Information:
* Shifting hard into first gear is a common problem with the 2002 Altima automatic transmission.
* The transmission control module (TCM) can also cause shifting problems. If you are experiencing shifting issues, it would be a good idea to have the TCM tested.
