We don't know what people have when we say pro type scan tools. What I sent are answers that other mechanics are having similar problem s with like yours and those are tips that were given. Is there an air gap? Are the sensors good? They have very thin wires and can be broken/disturbed just by hitting them. The wheel bearing you installed is it the correct one as there are several. Here is another tip
have always just scanned ABS codes and if a speed senor was open or shorted I would just replace the bearing [and we all now how common they go bad on GMs]. Had a 05 colorado in and these new bearing and speed sensors are not together. So I replaced speed senor and still had same p040 code so I did some looking around and found out they should be replaced together[great]. Also check speed sensor signal volt at sensor these module are know to go bad. I just had one that the right sensor had no volts going to it, so its a dealer car and they don't care so I jumped power from the left and hooked it to the right [at to computer] and problem solved. Hope this helps?
Thursday, June 6th, 2013 AT 7:14 AM