Question

I'm getting a c0040 and c0253 code on my 2006 cadillac sts (3.6L) but I can't find out what they mean or where they're located on the vehicle.

Answer 1

C0040 is related to the RIGHT FRONT abs sensor (passenger side)

C0253 is also related to the abs system try to fix the C0040 first, that might be setting of code C0253

see picture below for location and diagnostic procedures