Nate, I have an 01' and it was doing the same thing. Try searching "overboost" and you might find that thread. I installed an airaid intake and suddenly was getting an overboost code while attacking hills pulling my 30' 5'er. Never happend except when under big load. Took it to the dealer and asked for an ECM update to the 2002. (reccommended by some on this site) Of course they(dealer) said there is no way to do that. Not sure what they did but it has never happend again. Talk to John Kennedy on here he has the knowledge and the tuning capabilty to take care of it and you could get rid of the super chip. Make sure your filter is clean and the MAF is clean and oil free. Not positive what the max boost pressure is for the 02'.
Shed
01' LB7 2500 HD ext.cab, auto, 4" magnaflow, airaid intake, Mag-Hytec tranny pan, all Amsoil, Bilsteins.
In pusuit of the perfect camper pulling rig....
05'-30' Pilgrim 5th wheel
Always on the road headin for a campsite!