not an answer, but i had no idea that the new trucks (99+) had a separate computer that covers components out side of engine operations, or has this type of equipment been part of most vehicles all along?
1989 GMC 1500 f/s stepside reg. cab--4.10's w/Eaton posi--Swapped in LT1--T56 w/SPEC clutch--LT4 Hotcam Kit--Lt4 km--Vented opti conv.--Meziere h2o pump--Taylor over-the-valve-cover wires--K&N CAI--Dynomax coated mid- length headers--True dual Flowmaster 40's no cats--Pcmforless programming
323rwhp/332rwt
13.5 @ 98 1.9 60' (with old 700r4 and ET Streets)
1998 Z28 A4--stock