Had the check engine light come on and off for the last week or so. Ran the codes this morning. 4 total codes. Some may be old stored ones, I don't know. My cheap reader doesn't distinguish old vs active. Truck runs fine, doesn't seem to have any issues, just annoys me. Calling the dealership today and putting it in their hands. Maybe I'll have them look at transmission recall while they have it as well. Probably going to have to fight them for a loaner, but I'm 45 minutes away from them. I'll have to have something.