Actually,
I know why your check engine light is on. I made a mistake on your tunes. You have Excursion tunes. I loaded TNAA4
N2 programs on the chip when you needed TNAA4
S2.
I apologize for that since Bill's computer has them right next to each other in the list and I obviously tagged the wrong one. Tomorrow I will give you an RMA number so you can return the chip to us. I will get it burned with the correct code for your truck. Don't worry about shipping as I will refund it when I ship the chip back (as long as it's ground

).
Sorry for the inconvenience.