i had the same problem. mine was the sensor that reads the egr. but in my reseach for mine i found that i can be cleaned. i can't remember what to use but i got my information from the dealership. but the sensor is a common problem. when i had mine replaced at the dealer with 35k miles on my truck the service man told me the sensor for my truck has a 50k warranty because of the problems they have had. hope this will help.

furrby