That is the worst failed system since the old Cadillac 4-6-8 they had back in the 70's. The AFM system is a huge failure IMO, how many customers has GM lost as a result of it? my bet is a ton of people. The same goes for the piston slapper engines also, GM just seems to accel at finding new ways to shoot themselves in the foot.If I understand, the GM chips are for Displacement on Demand. Trucks are being sold without them, trucks didn't used to be part of the CAFE standards!!