First you must find location of this unit. Once you have done that, you will know what tools to gather up.
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.
One of the speed sensors runs the speedometer/odometer and transmission shift patterns, other speed sensors run the abs and or traction control.
You need to replace the speed sensor on the rear of the transmission.
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.
My 98 intrepid would not shift out of second when one of the transmission sensors went out. I think it was about $125 to replace at the dealer. There is a second transmission sensor that went out at another time. The speedometer did not work then. Same price to fix.
the two sensors on a transmission communicate with the computer to the engine and tells the transmission when to shift up or down....
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
That depends on the year, make, and model. Most newer cars do not have a dedicated speedometer or odometer wire. The speed sensors are also used for shift timing. If it as old enough vehicle that has a dedicated speed sensor the speedometer and cruise would also not work. Some vehicles, such as 1998 on up Dodge trucks, use the abs sensors for the speedometer and odometer.
Shift solenoids are inside the transmission, and require disassembly of the transmission to replace.
There are two speed sensors for this car. One is located in the transmission an the transmission needs removed to replace it. An the other sensor is located right above the passenger side trans axle "CV Shaft". This one tells the car when to shift an also tell the car's speedometer what to read. if this one is bad it will cause the car to shift hard an sometimes not at all. it will act like its stuck in first gear an not want to shift into second or over drive.