Let the truck cool off completely start with a cold trans put the trans into temp check mode and let it warm up at idle when the light comes on solid your at proper temp to check when it starts flashing your too hot to check accurately. Check temp is like 120 or so, average operating temp is much higher like 180 or so level can't be checked at operating temp.I wish I did, I don't have a temp gauge for my trans. I probably should take it to the dealer but not sure what to ask for. I want to order a gauge pod for a Oil Pressure and Trans Temp Gauges so I can monitor them better.