Join Date: Jul 2009
Location: Diesel Town, U.S.A.
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If you guys returned to the stock tuning, then you need to make sure the stock exhaust is installed. Without the stock exhaust, the stock tuning file will not allow the truck to start unless all the sensors check out.
If you want to get past this, you can plug at minimum, the rear-most exhaust temp sensor into the factory harness. It doesn't need to be in the exhaust, it just needs to be plugged in to complete the circuit. If it doesn't start at that point, re-tune to the DPF delete tune, and see if it starts. If yes, then make sure that you have the rear sensor plugged in, then try the stock tune again.
Let me know if you still have issues.