ABS module?

What is your question?

My '05 Trailblazer's ABS module has went bad. I've replaced both front calipers and pads, both front hub/bearing assemblies, both front wheel speed sensors, and cleaned the ground that attaches to the frame. The brake light and ABS lights come on and go off still and the pedal still pulsates. My local mechanic says that if I order a new ABS module it will have to be programmed/calibrated by a dealer. Is this true or not??? Any help or advice would be greatly appreciated. Thanks.

What makes this problem better or worse?

Low-speed braking.

How long has your 2005 Chevrolet Trailblazer had this problem?

A few months.