2003 Chevy Impala.
Engine size = v6.
Dash lights = service traction.

Question = I've been hearing a vibrating sound or grinding sound when i first push the gas pedal. It used
to happen every once in a while and now its doing it more often. A couple of weeks ago i pushed the gas
and the grinding sound came on, then the service traction system light stayed on. The light isn't on
every time i start my car. It does the sound only when i step on the gas and the light doesn't come on all
the time either. My question is why or what is making that sound and causing my service traction light to
come on? Oh and when the service traction light is on, my abs light comes on also.
Answer:
You probably have a bad hub bearing and/or wheel speed sensor. When the service traction light is on,
usually the ABS light is on as well. Either way, there will be a trouble code stored in the
electronic brake
control module. If the noise is like a growling or rumbling sound, or a metallic type noise, you have one or
more hub bearings that are bad. The wheel speed sensors for each wheel attach and are part of the hub
bearing assembly. You would need to take the car to a shop that can scan the computer and see what
codes are set to aid in diagnosis. Also, sometimes the wiring harness to the speed sensors either breaks
or gets rubbed through and that can set the service traction light on too.


Question: My 2005 Chevy Impala service traction light is on and as I'm driving it makes
this noise that sounds almost like I'm driving in the air or motor cycle sounds.
12-23-10
Ok thanks. If i wait to long to service this what can happen?
Comments
If it is a hub bearing noisy, and you wait too long, you risk
having the bearing break apart. This can cause the
wheel to fall of. This is rare, but I do not know how loud it
is without hearing for myself.
5-31-10
is there away to test the speed sensors
There are to ways to test them. Using a Digital meter,
test the terminals for resistance. Should be about
900-1400 ohms. Also, you can put your meter on AC
volts and spin the wheel and look for the reading to
change.
1-5-12
THANK YOU. YOU JUST ANSWERED MY QUESTION AS WELL
4-20-12
I have similar problem on my Chevy Impala 2001. This discussion was helpful. Thanks
guys.
This seems to be a common problem with Chevy Impala's.  Mine kept reaching each hub/
wheel speed sensor was out so I ended up replacing all them and still have the ABS
problem and service traction system on.
Wiring is a big issue with this car!
I have the same problem with my chevy impala it a 2003,I HAVE Replace hubs, brake
pads, disk, and still have the same problem. SOMEBODY OUT THERE HELP ME. I have
scan the car and cant solve the problem.
If you can scan the codes and they are for one of the
front wheel speed sensors, the hubs did not fix it, then
you need to check the harnesses going to each sensor.


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Chevy Impala Traction Light And Grinding Noise
pancho said:
i have a 05 impala my abs n traction off light is on just change the wheel hub bearing and nothing any suggestions.

Jim said:
Reply @pancho, If you know which one the light is on for, and the hub did not fix it, most likely there is a broken wire in the small harness near the hub
connector. You will have to carefully cut the insulation and pull on the 2 wire to find the one that is broken.