ABS,Service vehicle, trac off lights on on 2001 Pontiac Grand Am

ABS keep coming on at random times not just at braking, have had 3 wheel bearings replaced now the repair place said something is causing them to go out and thats why the lights are on but when they check to see why the lights are on it shuts the tester down

1 answer 3 comments
How long are the new wheel bearing/sensor lasting before the lights come back on? Are they setting fault code(s) for a wheel speed sensor? The same on every time?
replace your hub
I am still having this problem now at about 6 or 7 wheel bearings and 3 from a second repair place which keeps telling me it is becasue of how they are made and where they are located on the 2001 grand am, I talked to someone and they thought maybe the wiring could be the problem and its not the bearings themselves? They have been back on for about 3 months again now when backing out and put it in drive low trac comes on and its like its trying to stall but then goes off once I get going.
my car does the same thing abs,service vehicle,trac off light comes on. except usually when i hit a bump or turn is when the lights come on and also when i brake sometimes i can feel the brake peddal vibrate. does anyone have a answer to this