engine light

Hi. I have noticed that all my dashboard lights come on when I turn the ignition to on position except my engine light. I have tried three different auto shops that say they cannot communicate with the diagnostic computer. I have searched all fuses and cannot find any issue with them. I am...

***WARNING*** I need your help but since this my very first thread I'm giving y'all some background info, sorry it's long but I'm not mechanically inclined and I don't have a lot of money to fix whatever is the issue -- I may need my truck to live out of here soon so I am desperate to make it...