Had the spartan tuner installed recently and was changing the tuner from 275 down to 40 uploaded DPF ON needed to be DPF OFF. Started the truck drove down the road came back and turned the truck off. Now truck won't start at all. Any suggestions ???

 

Have you tried to reload the tune? You can change the setting of the dpf and egr when it asks you if you want to make changes if you dont know that. Hope this fixes it

 

Try unhooking battery cables and with both cables disconnected from both batteries hold pos to neg cable so they're touching so any juice in computer is drained wait a minute then hook battery back up worth a shot at a computer reset see in how it did it just after a tune I know it works a lot on security lights.