my truck actually did this when the first oil change was due... and flashed a code dealership said it was common???? how long has it been since you changed the oil?
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Travis 
06 2500 Megacab 4x4 18x10 Incubus Recoils on 35x13.5 Dick Cepeks 2" leveling kit, Edge Juice with Attitude HOT w/dash mount, AFE Stage II w/Pro Dry, B & W Hitch, 15% tint, Billet Locking Fuel Door