Our Community is 705,000 Strong. Join Us.


ABS, Trac Off Light Keep Coming On


rhaltunen
07-14-2006, 08:33 PM
I have a 2000 Grand Prix GT. The ABS and Trac Off light keep coming on more and more frequently. There is no difference in braking performance. The other day, I heard the anti-lock brakes kick in at the same time the ABS and Trac Off lights were on. The front passenger wheel bearing was replaced about six months ago. Any idea's? Thanks

goser
07-14-2006, 10:14 PM
Do a search about that and you should come up with a whack of info. Basically I seem to recall it's a bad ABS Sensor. Did it start after your bearing was replaced? What brand did you use? It happens on my wife's car when it rains, but I've yet to get under there and find out why. Pray it's just a nicked wire somewhere...

richtazz
07-15-2006, 05:55 AM
It is most likely another bad hub bearing, or if you (or the mechanic) used an impact wrench while installing the new hub, you could have damaged that one as well.

rhaltunen
07-15-2006, 10:32 AM
I have a 2000 Grand Prix GT. The ABS and Trac Off light keep coming on more and more frequently. There is no difference in braking performance. The other day, I heard the anti-lock brakes kick in at the same time the ABS and Trac Off lights were on. The front passenger wheel bearing was replaced about six months ago. Any idea's? Thanks


Thanks for the info so far. A while back, I had trouble with the car stalling out of the blue and you guys diagnosed it as a faulty crank position sensor. I brought it into the dealership and had them change it without doing a diagnostic test. They raised their eyebrows a bit after I told them I wouldn't need a new fuel filter, etc (or whatever else they were saying I needed). To make a long story short, thanks to you guys, the car does not stall anymore and I saved a BUNCH of money. Thanks again-Rodd

richtazz
07-15-2006, 12:04 PM
You're very welcome, we are always glad to help, and we appreciate the feedback too. We like to hear our advice helped you save some $$$$.

mtpina
07-16-2006, 06:23 PM
i have the same problem on my '00 GT, track off and ABS light on all time, have not replaced nothing, what kind of hub bearing is, should i take to a mechanic or is something i can replace myself, or how much does it cost reparing?
thanks in advance

GPNUT
07-24-2006, 06:51 PM
i have the same problem on my '00 GT, track off and ABS light on all time, have not replaced nothing, what kind of hub bearing is, should i take to a mechanic or is something i can replace myself, or how much does it cost reparing?
thanks in advance



Just replaced Pass. front wheel-hub assemb. in my 97 GP/GT just shy of $400 for diagnostics,parts/labor

wlkjr
07-24-2006, 09:36 PM
Just replaced Pass. front wheel-hub assemb. in my 97 GP/GT just shy of $400 for diagnostics,parts/labor

I did both of mine at the same time for about $320 parts and my labor. Sounds about right for a garage.

nfoss
07-25-2006, 09:21 AM
This happened to me last month on my 97 GT. I had the dealer diagnose it, and then replaced the back driver hub with a refurbished one I bought on eBay for ridiculously cheap.

richtazz
07-25-2006, 09:52 AM
mtpina, you need to take your car to a garage that has an ABS capable scan tool (the ones Auto Zone and Advance use are not ABS capable) to determine which wheel isn't sending a speed sensor reading to the ABS. Once you narrow down which wheel it is, if you're able to do your own brakes, you can do a hub bearing. You'll need a hub puller, 36mm hub nut socket (for the front hubs) and a good torque wrench capable of a 180ft/lbs setting (depending on what brand hub you buy) to do the job correctly. Whatever you do, DO NOT use an impact wrench on ABS sensor equipped hub bearings. The hammering action will ruin the ABS sensor and you'll be doing it again real soon.

herringtond
07-25-2006, 10:08 AM
This is happening to my 99 GT. I bought it, had the problem, took it in, they fixed it, and it stayed off for a bout a week. I took it back, they fixed it again. This time it stayed off for about 2 months. From talking to other people that have had those cars, and a buddy that runs a dealership, this happens alot. YOu can keep going in and replacing the hub assembly or you can deal with it as it doesn't really affect the car other than the traction control does not work.

wheelerem
07-25-2006, 10:41 AM
I also am having this problem with my 1999 Grand am. I had a alignment done and the transmission fluid changed two weeks ago(not sure this has anything to do with it) since them my low trac light has been coming on whenever I start moving, then my ABS light and Trac off light come on and stay on. Does anyone know if having the alignment done could have caused this.:shakehead

richtazz
07-25-2006, 11:20 AM
I also am having this problem with my 1999 Grand am. I had a alignment done and the transmission fluid changed two weeks ago(not sure this has anything to do with it) since them my low trac light has been coming on whenever I start moving, then my ABS light and Trac off light come on and stay on. Does anyone know if having the alignment done could have caused this.:shakehead

Since your problem is different, and it's a different vehicle, you should have started a new thread in the Grand Am forum. To answer your question, it is possible that an alignment could cause an ABS sensor to fail, especially if they used impact tools to loosen the lower strut bolts. The hammering action can and will crack the ABS sensor, causing the ABS and Trac-off lights to illuminate. It is also possible it's unrelated, as the hub bearings on your car are quite fragile and a high failure part.

BNaylor
07-25-2006, 11:34 AM
I'd say at least half of wheel sensor problems is bad or damaged wiring. The electrical connector at the hub is subject to the elements/corrosion and a mechanic can BFFI the job up such as in an alignment or doing a brake job.

Therefore, do a thorough inspection of the wiring and electrical connector at all four wheels. Also, the wheel sensor can be ohmed out with a mulitmeter. Check for around 1K ohms at the wheel sensor contacts.

Finally, the quality of the hub bearing is important. Garbage in garbage out.

wlkjr
07-25-2006, 02:14 PM
I did mine in March with AC Delcos that I got from Rich and have not had any problems from them.

BNaylor
07-25-2006, 04:01 PM
I did mine in March with AC Delcos that I got from Rich and have not had any problems from them.

Wlkjr,

:nono: In case you were not aware it is against AF rules to openly refer or advertise another member that sells commercial automotive parts without authorization from AF Administration and meeting certain guidelines as an authorized vendor. Rules are rules. Sorry.


For AF non-commercial private party members we have the following areas/forums:

Grand Prix Forum
http://www.automotiveforums.com/vbulletin/showthread.php?t=595300

AF Cars/Parts for Sale/Exchange
http://www.automotiveforums.com/vbulletin/forumdisplay.php?f=1269

wheelerem
07-27-2006, 05:37 AM
just to let you know, I took the car to fire stone and they put it on there machine and found that it was the hub bearing on the right side, now it is just wait and see that this will have worked. Thanks for any suggestions that were given!!!!!!!!!!!!!!!!!!!!!!!!!:)

WRBsGTP
07-27-2006, 09:08 AM
Hi guys,

I am having the same problem as everyone else on this thread. ABS and "trac off" lights on. I started a separate thread before looking closely at the other posts, and for that I apologize.

I took my car to the dealer a few months ago, and they told me that my passenger hub bearing needed replacing. I didn't think much of it until I read the posts in this thread. The dealer quoted it as a $400-500 job, so I've been hesitant to do it. My question is why would a bad hub bearing cause my traction control to stop working?

Once again, I apologize for not looking closer at the forum before posting. Please don't flame me for it. :uhoh:

wheelerem
07-27-2006, 09:10 AM
Firestone only sharged $275 + NYS tax

Mobiletec
09-19-2006, 07:12 PM
Hello everyone Ive got a 2000 Grand Prix Gtp also with same problem I Have a tech 2 scanner and scanned the ABS system the code i get is (Right Front Wheel Speed Sensor Malfuntion. The DTC code is C0040. I also get a code in the history DTC`s Not sure what this is could one of the guru`s here mabe give me some idea the code is C0244 PWM deliverd torque malfuntion. Thanks in advance. Is this part of the abs as well.:) :)

BNaylor
09-19-2006, 09:58 PM
Hello everyone Ive got a 2000 Grand Prix Gtp also with same problem I Have a tech 2 scanner and scanned the ABS system the code i get is (Right Front Wheel Speed Sensor Malfuntion. The DTC code is C0040. I also get a code in the history DTC`s Not sure what this is could one of the guru`s here mabe give me some idea the code is C0244 PWM deliverd torque malfuntion. Thanks in advance. Is this part of the abs as well.:) :)


What brand Tech II is this? A properly programmed GM Tech II scan tool generates different ABS codes. Typically they are C12XX, etc. For an ABS VI and higher system they start at C1211 and continue through C1363.

C0244 does not exist nor is it a valid DTC per the GM service manual.

richtazz
09-20-2006, 05:44 PM
To answer your question WSB, the hub contains the wheel speed sensor for the ABS and traction control. When the ABS module doesn't receive a signal from a wheel, it disables the traction control and ABS. Regular braking won't be affected, but if you need ABS intervention, it won't be there, so adjust driving habits accordingly. If you have some mechanical ability, a repair manual, and the right tools (torque wrench, hub puller, axle nut socket), hubs aren't that difficult. I would rate the difficulty level on par with doing your own brake job.

BNaylor
09-20-2006, 06:28 PM
To answer your question WSB, the hub contains the wheel speed sensor for the ABS and traction control. When the ABS module doesn't receive a signal from a wheel, it disables the traction control and ABS. Regular braking won't be affected, but if you need ABS intervention, it won't be there, so adjust driving habits accordingly. If you have some mechanical ability, a repair manual, and the right tools (torque wrench, hub puller, axle nut socket), hubs aren't that difficult. I would rate the difficulty level on par with doing your own brake job.

:nono:
This reply post was absolutely unnecessary Richtazz. WRBsGTP started a different post and eventually I clearly recall resolved his issue. See his quote and the link below.

http://www.automotiveforums.com/vbulletin/showthread.php?p=4303122#post4303122

Not a good idea addressing a post going back a few months.


Hi guys,

I am having the same problem as everyone else on this thread. ABS and "trac off" lights on. I started a separate thread before looking closely at the other posts, and for that I apologize.

I took my car to the dealer a few months ago, and they told me that my passenger hub bearing needed replacing. I didn't think much of it until I read the posts in this thread. The dealer quoted it as a $400-500 job, so I've been hesitant to do it. My question is why would a bad hub bearing cause my traction control to stop working?

Once again, I apologize for not looking closer at the forum before posting. Please don't flame me for it. :uhoh:

Add your comment to this topic!