2002 Dodge Neon NOT SHIFTING OUT OF FIRST

Most likely its a speed sensor or solenoid need to check for codes cycle key on off on off on read codes in odometer area let me know. This guide can help

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

P0700 is a tranny commanded check engine light on
due a trouble in it
have to use a scanner to get the tranny scanned for codes
still suspect and very common is the speed sensors you have two input and output if you are to replace one do them both
also tranny solenoids is another possibilities
good luck
let me know