Welcome! Some of those issues are common and unrelated to the BCM. Namely, the ABS/TRAC OFF lights are usually due to a bad or broken wire in the speed sensor harnesses going to the front wheel hubs. Dorman sells replacements.
BTW, I have a 2000 LS parts car, still has some decent interior trim and some electronic stuff, let me know if you need anything.
Good luck with the new ride!
*2001 Impala Ls - 141k
Precision 6262 Turbo, ZZP Z3, Tial wastegate and BOV, CXRacing intercooler, ZZP 3" turbo-back w/ muffler delete, Bosch 42.5# Injectors, Bosch fuel pump, CTS-V Brembos, Stainless lines, BC Racing coilovers, Dorman solid sway bar, BMR trailing arms, SPEC-D LED headlights, LED heads and fogs, Quad tails, C5 reverse lights, All LED interior, LED 6 gauge cluster retrofit, LED puddle lights, LED underglow, Debadged, Painted emblems, Color-matched trim, Wrapped dash & door trim, Kenwood DDX271, Polk Audio dxi6500 components, Polk Audio db690, Hifonics GLX100.4, 2x Polk Audio db1240 in custom box, Hifonics ZRX1800.1D, KMC District, Nitto NT555G2, SS tail covers, SS spoiler, SS Lip, 20% tint, Black mesh grille
*1999 Escalade - 150k
Winter daily on 22s
*2001 Dakota - 99k
Custom painted runaround
*2014 Impala LT Limited - 65k
*1992 Caprice Wagon - Sold @ 195k