* Low transmission fluid: If the transmission fluid is low, it can cause the transmission to overheat and shift erratically. Check the transmission fluid level and add more if necessary.
* Dirty transmission fluid: Dirty transmission fluid can also cause the transmission to shift erratically. Have the transmission fluid changed if it is dirty.
* Faulty transmission solenoid: A faulty transmission solenoid can cause the transmission to shift erratically. Have the transmission solenoid tested and replaced if necessary.
* Faulty torque converter: A faulty torque converter can also cause the transmission to shift erratically. Have the torque converter tested and replaced if necessary.
If you are not comfortable performing these repairs yourself, you can take your car to a qualified mechanic for diagnosis and repair.
