Same place you check it.
start by checking the transmission fluid level when the vehicle is at normal operating temp
No, there is no connection between losing transmission fluid and the speed odometer not working. My mother's car lost all of it's transmission fluid but the odometer still worked.
Check the viscosity of your transmission fluid, then ask what's appropriate weight for transmission fluid in your area.
Where is the rear washer fluid reservoir located on a 1991 Pontiac Transport
could be a bad modulator valve but i would change filter and fluid in transmission first
2008 pontiac g6 transmission capacity ?. /
It's in the transmission.
All of the transmission fluid is inside the transmission. There is no external reserve.
When changing the transmission fluid of any car, it is important to know how much fluid to put in. A 2001 Pontiac Sunfire takes 2.5-3 quarts of transmission fluid.
Maybe internal transmission problem 1st and cheapest step would be to change fluid and filter
The transmission dipstick tube
Because your transmission has a seal that is leaking.