should I check thottle position % with scanner for opens, how do I know what speed sensor
Hello and welcome to Just Answer!
This is a new Expert here! The most common cause of this is the output speed sensor on the left rear side of the transmission. The throttle position and engine load won't have anything to do with it not shifting out of first.
The output speed sensor tells the PCM the output shaft speed of the transmission which is then used for governor pressure calculations for the electronic governor. When the output speed sensor signal is missing there isn't any way to control the governor and it will normally stay in first gear without attempting to up shift. The output speed sensor can be checked with a scan tool or an oscilloscope. You can also check the resistance with an ohm meter to see if it is open or shorted. The resistance should be around 580-700 ohms.
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