2000 Blazer transmission problem

i have a 2000 blazer that will only go into 2nd and 3rd gear. i cant get it into 1st or overdrive even manually. i have replaced the silinoids. my transmission is a 4l60e. it is also 4-wheel drive. i have a code po753. i wasnt sure if there was a relay switch or not. any ideas??


yeah all the wires and sensor are intact and okay .. the code will clear and once you drive it for 5 miles or so it comes back up. still only 2 gears i changed 3 selinods one lock up, and 1 prkin and the other one .. there is three other plugs/ sensors there should i change them if so what are they.. and where is the fuse i checked main under the hood and it sed nothing about transmission. i bought a haynes and it dont really say anything.. thanks

No relay just fuse.
Make sure fuse is good.
Then check wiring in transmission pan and plugin and from plugin to pcm and test new solenoid ohms.
The solenoid plugin is easy to knock off when installing pan.
Make sure it is plugged in good.

Any other codes?
Will code clear.