as stated, check the fluid level. "what my next steps would be."
that would be to have the trouble codes read. not all codes prompt a lite.
best to have a reputable ASE shop or the dealer do a diagnostics check on this.
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DIY,
you can go to most any auto parts store and if they have the time, will read them for you. write them down and look them up here,
http://www.ncttora.com/fsm/1996/SIL/...di/at/dtcc.pdf
that's a free FSM for your truck. fully search-able. so just click on the trouble code hyperlink to test the component in question.
if you have a code reader, this is how you do it,
http://www.ncttora.com/fsm/1996/SIL/.../at/preche.pdf
FSM,_online, http
FSM,_online, http
FSM,_online, http