2001 Cadillac STS ABS light, brake light, tracton control l

2001 Cadillac STS

Last summer, had tires put on the car, and immediately when I left the tire shop these lights were on the dash. They erased the codes with their scanner it worked well for about 5 minutes. A year later they come on at start up, sometimes not, sometimes go out, sometimes not. Until the abs and brake go off, if they do I have no heated seats, fog lights, defrost up front. Had a command start put in 2wks ago. Took to deal today and they said they couldn't read any error codes until the command start was disconnected, mech disconnected command start and said there were no codes. No lights on when I left dealership. Later in the day all 3 came back on, went to dealer and couldn't get the scanner to read off the car. They now tell me that it might need a new PCM $1300, a place to start! That is why the scanner won't read. If that is not the problem I have to keep it anyway because they can't return to GM once used. I went home and found tons of error codes using the onboard controls on the dash. I'm not in a position to dump $1300 just for them to guess! If I manually erase codes using dash controls everything works fine for a while. I keep thinking it is something to do with the wheel sensor wires. Codes I found were: PCM 1571,1644, U1040, RSS c0635, c0640, c0710, SDM u1040, IPC u1040, u1000 ABS 1277. I hopes these help