P1309 Misfire monitor AICE chip fault
And sorry, but that’s all I’ve got for you. I do ok with a lot of trouble codes, but don’t know where to start with that one. (I do fear anything that says “chip fault” though).
I’m sure someone else can tell you how you might sort it out. It will help if you add info about the truck - mileage, what problems is it having, some idea of maintenance history, etc.