Is the light still on? If so then you can go to your local AutoZone or parts store and have them check it for free to see what code they getMy Toyota dealer just told me I have diagnostic code P2770. On page one of this thread is a link to a "comprehensive" list of all possible "P" codes, but P2770 is not listed. Is my dealer scamming me? He says my torque converter solenoid has failed, but also says the wiring shows indications of shorting/damage. Could my problem be nothing more than wiring damage?
You can find a cheap OBD 2 reader on Amazon or eBay for future use!