ignition switch

A question, my wifes 02 has been throwing an AWD/ANTILOCK code for some time I was under the impression this was a wheel speed sensor. Last week she called me stranded tek would not start towed it home guess what it starts on the flatbed as they were getting ready to drop it. Anyway long story short hooked up to a portable scanner & got a P1626C code, theft deterant fuel enable signal lost also LF speed sensor,now heres my question a GM tech told me today the ignition switch going out could throw both these codes has anyone else heard of this any info would greatly be appreciated thx........