2001 Pontiac Grand Prix 3800.ABS and Trac off Lights sometimes.
Transmission code was on and speed sensor light, change both front hubs.
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 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 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.

Answer:
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 receipt, then i
could give some advice.
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
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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Pontiac Grand Prix ABS Light After Changing Hub Bearings
Live Chat:

Question: I have a 2001 Pontiac Grand Prix. My trac off light is on and ABS is on i have changed struts, parking brake, whole hub assembly
and control arms and i checked the wiring they still there.

Answer: Which hubs did you change and why.

I changed both hub and bearing assemble and has the ABS sensor already in it.

So you were guessing at the problem? Did you scan for codes?

It wont
scan codes because Engine light is on.

Engine light is for the engine computer? ABS and Traction lights are not in the engine computer- they are for the ABS computer.

Yes i knew that but i don't have scanning. The wheel bearings were wore out.

Without the
ABS codes, you would just be guessing at the problem. It could be a rear speed sensor problem.

I changed it if thats what is in the hub and bearing assembly.

So the front hubs have been changed, the rear sensors changed, the front struts and control arms, wiring checked. Was wiring checked with
an
OHM meter?

We checked the new sensors with a ohm meter and got 1068 ohms.

What about the wiring from the front sensor connector tot he body connector?

Are you talking about the wiring to the radiator support?

From the control arm, yes.

How do u check that ?

With an OHM meter while wiggling the wires.

Is that the wiring harness that plugs into speed sensor?

Yes.

Yes we wiggled the wire but not with a ohm meter because i don't know what its suppose to read.

It should read less that 2 ohm of resistance from wire end to wire end.

From each terminal?

No. Disconnect the sensor. Check a wire from one harness connector to the other end of the harness.

Do you ground one end to the body then touch the terminal to the other lead from ohm? We took it to someone and they said they cant check
that.

No, one lead on one end of the wire, other lead on the other end of same wire.

(4:31:09 PM) Joe: http://www.greatautohelp.com/Electrical-Diagnosis/Index.html

No i haven't. What if its three?

3 ohms is too high.

So what should we do .

If the reading is too high, you have a bad wires.

OK thank you very much for all your help !