It could be your speed sensor. Mine ran fine for the first 15 min or so, then it would shift into first and stay there and I'd have to drive home in first, and was told that it could be the speed sensor. If it's not working properly, it lets the computer think that you're not moving, so it,(the tranny), does what it's supposed to, and drops to first gear. Hope this helps.
throttle body sensor is a sensor that regulates gas flow. if your car is running sluggish sometimes this can confused with transmission problems when in all actuality its the sensor
It tell's it when to shift ....depending on throttle position
The 1997 Ford F150 4.6 liter engine throttle position sensor is located on the top of the transmission. The sensor will be connected to the fuel injection rail.
The Throttle Position sensor measures the throttle position, which is controlled by the gas pedal. It is used to determine engine load and if it fails it can cause automatic transmission shifting problems.
A sensor has failed, and is reporting the wrong value to the transmission controller. Old transmissions: Probably the vacuum modulator or throttle position sensor. Also check the fluid level. New Transmissions: Output speed sensor, turbine speed sensor, throttle-position sensor, fluid pressure sensor, and sensors on the engine.
throttle body sensor is a sensor that regulates gas flow. if your car is running sluggish sometimes this can confused with transmission problems when in all actuality its the sensor
On a computer controlled transmission, the throttle position sensor is one input used for shift timing.
A bad throttle sensor can cause several problems. Symptoms include rough idle, loss of power, and even power surges while driving. .
Probable failed throttle position sensor.
i have a 1996 Mazda protege and it is at the rear of the transmission if you're looking from the front drivers side. it is almost directly under the throttle position sensor which is located on the rear of your throttle body close to the firewall (almost directly in the center of the engine compartment).
throttle postioning sensor is bad
Your transmission might automatically shift out of overdrive while driving on the interstate because of low transmission fluid. This issue might also occur because of a bad transmission sensor or overdrive sensor.