The transmission may shift weird if at all. The year, make and model info would help.
A vehicle speed sensor is the culprit
No input sensor. The vehicle speed sensor is located in the top of the housing that the right axle shaft goes into.
The speed sensor wire is connected to the speed sensor and goes to the speed sensor relay switch. The speed sensor relay switch is connected to the computer by a separate wire.
There is no maintenance schedule on this part. You replace it if and when it goes bad.There is no maintenance schedule on this part. You replace it if and when it goes bad.
The speed sensor, on your Nissan, has a black cable. The speed sensor does not actually have any wires. The cable goes to the speedometer.
If a transmission speed sensor fails, the transmission will default to second gear.
On the automatic the computer factors vehicle speed using the output speed sensor on the front of the transmission. On a manual it should be on the housing where the passenger side axle shaft goes into the transmission.
Probably does not have a speed sensor. It would have a speedometer cable that goes from the back of the speedometer, through the firewall, underneath the car, and into the transmission.
If it has a 4-speed transmission, it has 2 speed sensors, one for input speed and one for output speed, located on the front of the transmission. If it has a 3-speed transmission, it is located under the vehicle on the back of the transmission, where the passenger side CV axle goes in, to the left of the inner joint.
Alot of vehicles will enter a "limp" mode if a major sensor has failed. This is usually a low gear so that you can still drive the vehicle out of harms way. It is possible that the speed sensor or something like that has failed. Hope this helps.
The speed sensor connector is located on top of the transaxle, passenger side. It is next to the end where the CV axle goes into the transaxle.
Above the transmission output shaft. There's a quick connect which goes to the speed sensor.. you can take the speed sensor out with a ratchet and socket.