My 2001 Pontiac Grand Prix
3.8  3800
ABS and Trac off Lights sometimes  
codes = Transmission code was on and speed sensor light
Change both front hubs.
work done to repair = Both Front hubs with speed sensors

GM tech = SF
question = Ok here goes.  My car ran fantastic for a long time.  It hit
about 60000 miles.  I noticed some growling from the car.  Happens
when i turn corners or inclined driveways sometimes out of nowhere.
Shakes steering column.  Why does Sometimes it kicks on my abs light and
trac off light.  Also, and maybe tied with in previous condition list earlier.
When vehicle is warm it shifts hard.  I took it to a mechanic in my town
and he said i had three codes.  One transmission code and one code for
my hub assemblies needing replaced.  I dont remember what the other code
was.  I did however go to auto zone and they tested my car and no
codes came up.  What do you think could be the issue of these problems.
Sorry to add on but I did change both wheel hub assemblies.






SF:
The codes are really the key. The trans code are not hub related. If no  
codes came up at Autozone, then i would suspect the local mechanic  
cleared the codes,and one or more just have not returned yet, even though
the shifting problem. If you can find out what the code numbers were-  
maybe on mechanics reciept, then i could give some advice.
WARNING LIGHTS
Anti-lock brakes are designed to prevent skidding and help drivers maintain steering control during an emergency stopping  
situation. In cars equipped with conventional brakes, the driver pumps the brakes, whereas in cars equipped with four-wheel ABS,
 the driver keeps a firm foot on the brake allowing the system to rapidly and automatically pump the brakes. Because the wheels  
don't lock up, drivers have the ability to steer around hazards if they are unable to stop in time.  

When the braking force created by the driver is greater than the tire can handle, the wheel can lock up. Locking wheels can create  
vehicle instability problems and prevent steering around obstacles in the road. Stopping distance on many slippery surfaces will  
also increase with locked wheels. Four-wheel ABS prevents wheel lock-up in situations in which the wheels might normally lock,  
such as on slippery roads.
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