The VSS (Vehicle Speed Sensor) is probably bad. Also check the fuses.
Check for a blown fuse.
Sounds like the speed sensor is bad.
Speed sensor on rear of transmission where speedometer drive used to be. If ecm receives no speed data transmission, it will send no shift signal.
The speed sensor sends a signal to the speedometer to show the correct speed and it sends a signal to the transmission telling when to shift. If the speed sensor is bad the speedometer will not work and the transmission will not shift correctly.
The speedometer is controlled by the speed sensor and it also sends signals to the transmission on when to shift so your problems could be related. The speed sensor is easy to replace and is located on the transmission.
Sounds like a grenaded transmission
this is usally caused by your speed censor is gone it should be located on top of transmission drivers side of car it is the one with 2 wires plugged into it.
You need to replace the speed sensor. It sends a signal to the speedometer and also sends a signal to the transmission on when it should shift.
Replace your speedometer sensor. I just had mine replaced in my '04 Impala. The sensor tells the tranny when to shift. It's located right in front of the transmission.
Hopefully the simple solution would be the fuse 15a for the speedometer. If the computer doesn't read the speed, the tranny doesn't know when to shift. If the fuse is alright, you then need to check the speedometer sensor located on the rear axle hub. Check connections for corrosion and cable for damage. After that, good luck !!
On cars with an electronically controlled transmission, the answer is yes. The transmission may not shift properly.
You need to replace the speed sensor on the rear of the transmission.