Question about 2003 Chevrolet Impala

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Impala - trac off and ABS light along with service traction syst

On our 2003 Impala the traction off light and ABS light comes on at the same time as the service traction system warning message. The traction control and anti-lock brakes engage and stay on while driving, making "mooing" and "groaning" noises. We were told it had to do with needing new brakes and rotors. We did so. It still does it!
One mechanic told us that it needs the bearings to be replaced at $600+. But another more reliable one checked it and said that isn't the problem. So I Googled the problem and read that many Impala owners were having the same problems, getting expensive repairs made (one even for over $1000 in three separate stages of repairs) and was still having the problems.
So is there a solution? My husband disconnected the abs module, tried driving it and it seems to have gotten rid of the abs and traction coming on and noises, but the abs and trac off lights stay on constantly. And it starts out with the warning message, but goes off after a few minutes.
Help!

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  • Anonymous Mar 18, 2014

    abs light on, stabilitrak service light on. was told that the module that controls these needed replacing, is there a recall on the module

  • Anonymous Mar 21, 2014

    warning lights come on and stay on

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THE PROBLEM IS WITH A HUB WHEEL SPEED SENSOR OR MORE LIKELY THE HARNESS LEADING TO THE HUB.

CHECK THE RESISTANCE AT THE HUB CONNECTION, IT SHOULD BE BETWEEN 900OHMS AND 1300OHMS. THEN SWITCH TO A-C VOLTAGE, IT SHOULD BE 100MV WHEN TURNING THE WHEEL BY HAND. IF BOTH CHECK OUT THE PROBLEM IS IN THE WIRING TO THE HUB.

THE RIGHT FRONT HUB USUALLY HAS A BEND, DOWNWARD THEN UPWARD NEAR THE CONNECTOR TO THE HUB. THAT IS WHERE THE PROBLEM USUALLY OCCURS.

NEW HARNESS WIRES CAN BE BOUGHT AT THE DEALER.

Posted on Jun 18, 2009

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I agree with Amanda and BB1Bud. The problem is the hub bearing(s) and or wiring. I am a Ford Master technician but the Fords also have integrated sensors integral to the hubs on certain models. Sometimes the hub dries out causing metal particles to get on the sensor and the system does not operate correctly. In turn this sends a warning message along with warning lights to illuminate on the instument cluster. Also this can cause false ABS activation. The best way to determine a bad hub bearing is to " spin up" the wheels on a hoist and listen with a mechanics stethoscope at each hub near the mounting surface to the knuckle. A bad hub bearing will have a louder sound using the stethoscope than a good bearing and you will possibly find some side to side accessive movement in the wheel.

Posted on Sep 13, 2013

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I have an 01 impala ls. I had the same problem I Googled and you tubed it like crazy. I found out just working on it myself that is a hub bad either front or back. I have changed the front 2 and I was like wow when I pulled them the bearings were shot and both only had one bolt in on the backside of the hub, its suppose to have 3. They were factory hubs. Never been changed until I did it. So check your hub assembly on each wheel.

Posted on Apr 29, 2013

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I have this same issue. I have all the hubs replaced as they thought that was the issue because they weren't in good shape (well, the back two weren't). When that didn't fix it, replaced the two in the front a few weeks later.

Also replaced a lot of misc stuff under the car as maintenance, had it aligned, and had four new tires before this issue. Had in shop five times. Mechanic shop worked with dealer to reprogram the sensor, so the car drives better but I still have this issue. They finally figured it was a very tiny leak from something with the oil must be making the lines get wet and cause the issue. Every time they clean it the program clears up for 2 1/2 weeks. I can't bring it to the shop every few weeks - they said to replace those wires they would have to replace a box and it is too costly. The mechanics said they dont recommend it either as the issue is so mild for the amount of money. The traction/abs still drives me crazy though.

Posted on Jul 23, 2014

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