I have had my truck throw a couple of codes here in the last week. Last weekend it was a 1682,1693, and 0602. I cleared them with the Superchips Programmer and then the 0602 showed back up again the next time I drove it. The code sheet that came with the programmer says 0602 is ECM - Fueling Calibration Error. The truck is a 2000 2500 4X4 with a 5 spd. it has 60 hp injectors, K&N FIPK, Banks High-Ram, FASS 150/150 and 4" exhaust. The VP-44 was replaced a couple of years ago. I am pulling a 25' enclosed snowmobile trailer with 2 mountain sleds in it. The programmer is set on the hi-performance and the times it did this it would have a hard time firing (I would start cranking and start applying throttle to get it to start - starts harder than normal until I clear the codes). Any ideas on what is causing this?