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.  Happen swhen 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 foamy hub
assemblies needing replaced.  I dont remember what the other cod 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
MY 2001 Chevy Monte Carlo
ABS and Service Traction System Warning Light.
DTC Code 1216.  What does this mean and how much is the
repair cost generally. Do you know what the problem is...
Why does My 2002 Grand AM SES and TRAC OFF
Why does my  trac off light,  service engine soon come on. When
the trac off light comes on, it makes a thump when it goes through
the gears...
My 2003 Buick LeSabre ABS Traction Code C1214
Definition of "Brake Control Relay Contact Circuit Open,"
which doesn't sound  that bad.  The dealer says the EBCM
has to be replaced for...
2002 ABS and TRAC OFF Light Codes C0035, C0036
REPLACED BOTH FRONT WHEEL BEARINGS AND ALL FOUR
ROTORS AND NEW BRAKE PADS
question = WHAT IS MY ABS PROBLEM? Why does my car do this.
ABS Light and Codes C1223 C1225 2004 Pontiac Montana
It is my understanding that these codes are related to the ABS system.
My question is, should/would these problems have caused...
2002 ABS and TRAC OFF Light Codes C0035, C0036
REPLACED BOTH FRONT WHEEL BEARINGS AND ALL
FOUR ROTORS AND NEW BRAKE PADS.
question = WHAT IS MY ABS PROBLEM? Why does my car
do this.
A few Related Questions
Other Repair
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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.
1999 Pontiac Grand Am 2.2L 4 cylinder.
Warning lights: TRAC off.
Question = It has been very cold here...about 4 degrees. I put my park brake on to warm my car up in neutral. When I
drove off it seemed like the brake was still hanging up. Then it seemed to bust loose and was fine. That night I was giving
a friend a ride home and the left front wheel locked up. I ended up sideways in the street. We jacked it up and checked
the wheels.  They both turn. We towed it home. Now when I am in anything but park or neutral the trac off light comes on. I
can drive a little way, but then the wheel locks up. HELP? I can't get the car in the shop until Wednesday!
Answer: Well, the parking brake shouldn't have any issue on your
front wheel locking up. You could have a brake caliper that is
sticking and locking up the wheel, or possibly an ABS issue that
is keeping the left front line locked with fluid. With the trac off light
on, this is most likely related to the ABS problem. When there are
ABS codes, traction system is disabled. You'd need to get it
scanned to check for trouble codes, which could lead to a
possible bad pump motor or modulator valve that is sticking. If
you could get the car in the air, have someone spin the wheels
while you apply the brakes off and on trying to duplicate the
problem. This would show a sticking brake caliper more easily.

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