abs codes..

i just got a code reader yesturday. my abs light was on so i checked it. it read 22 27 65 12 21. i looked in my hayes book but could not find codes for the abs only the ecm. does anybody know where this list is ro could anyone tell me what these codes mean?
oh this is for a 95 k1500.
also i am going to ask this question again, is there a difference in the abs speed sensor and the vehicle speed sensor? they look identical and yet cost different.