It will depend on the model of Transmission. Most common for this a bad "Shift position sensor switch" sometimes also called the "gear position sensor".
SOURCE: HAVE A 1999 GMC SIERRA 1500 WONT MOVE IN FOWARD OF REVERSE
The torque converter has gone out.
SOURCE: no reverse
i had the same problem it is your reverse band has broke , trans has to be taken apart , its about a 60.00 part and a lot of labor
SOURCE: my car wont move forward or reverse
Chances are is that the torque converter needs to be replaced. However, the transmssion on this vehicle are only serviceable by transmision shops. No regular mechanic will open up the transmission. When the torque converter fails (clutch and plates shutters to small pieces) the debri flows in the transmision thereby potentially destroying the gears and/or clogging the filter and pump. Go straight to a reputable transmission shop and let them correctly diagnose the transmission.
SOURCE: Mazda wont go foward or reverse.
If you are lucky, you are just out of transmission fluid. Add fluid to refill the transmission to the mark on the dip stick. Afterward, you need to determine where the old transmission fluid leaked out and fix the leak. If refilling the transmission does not fix the problem, you then need to look at fixing the transmission. Are you sure the shift linkage is ok?
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