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Pontiac Repair/ABS brake light and Trac light is on


Chris wrote at 2006-07-07 21:14:34

I am way late to this question, but if you are still experiencing this, the probably is probably fairly easy to diagnose.  Almost always, these lights are due to a failed wheel bearing.  In which case, you will often start to hear a low level humming from one of the wheel wells.  As the bearing fails more and more, the noise will get louder.  Bearing failures are typical on the 01 Grand Am(and surrounding model years), so I would imagine it very well could be the same for the Grand Prix.I have replaced 2 on my GAGT already, both in the front.  

Autozone, etc does not have the readers needed for ABS codes.  You should be able to find a "cheap" shop that will at least read the tool for you and find out if it is indeed this problem. (Messes with the speed sensor).  

Cost me $140 in parts last time from Autozone, plus some labor of my own.

At a dealer, you will pay at least $200 probably for the new hub, plus at least an hour labor IMO.

Good luck.

alex wrote at 2007-03-23 18:56:07
I had this same problem or at least it sounds like the same.  It was the tail light socket there is a common ground pin  that gets overloaded and melts the plastic housing. I couldn't believe the condition of the socket. Anyway changed the socket assembly and no more trouble.

Drew wrote at 2007-05-09 15:38:38
I had the same problem with my 2001 pontiac grand am.  Brought it in for a diagnostic test and they told me it was my vehicle speed sensor.  So I replaced it and the lights went off.  It requires removing the entire hub assembly.

George wrote at 2007-06-03 14:45:56
Same problem here.  I just changed my rotors and pads on my 2001 Grand Am. Last month a mechanic changed my right front wheel bearing and I noticed when changing rotors, the sensor was not in it's clip.  I reconnected it. ABS and service vehicle soon light will not go off.  Tried repositioning, no go.  I too hesitate to spend a fortune at a dealer.  

GrindingNemo wrote at 2007-08-15 07:06:35
I have a 98 grand prix gtp that also has the abs and  traction control lights coming on at the same time. I don't know yet what is causing the problem, but the users manual does say that the lights can both come on due to brake problems. so yes the two systems are related

Lampjefe wrote at 2008-03-07 02:56:01
I have a '99 Grand Prix GTP with 183,000 miles and for the past 2 weeks the "ABS" and "TCS OFF" light come on at the same time.  Oddly, it feels like my power steering goes out too (the lights came on while making a U-turn once and the steering became very stiff).  I have a code reader and it says that there are no codes in the computer.  Since the TCS uses braking as a means of controlling lost traction I have assumed that there is a relationship to both of them.  I had my front hubs replaced about 20K miles ago.  Based on the preceding comments, it sounds like I need to have them checked to see if there has been a failure.  I am also hearing thumping and bumping when turning the steering wheel.

carvip wrote at 2008-06-12 21:39:59
This is a common problem with Pontiac Gran Prix.  Mine has been doing it for the past 30000 miles and the dealership has chnaged out just about everything including the ABS Module twice.  They changed the sensors, brakes, brake harness and still I have the same problem.  It is intermittent but very annoying.  I am not sure what all you can do but many people on various boards are reporting the same issue.

GUYGTP wrote at 2009-07-24 10:21:16
99 GTP with 60'000 miles here, had both front struts replaced 2 months ago, I've read that strut replacements or bad struts to begin with may have caused chain reaction that caused ABS/TCS lights to come on, also feels sluggish on turns....sounds like we are all having same effect and cause. Will update when solved.

MaxPower wrote at 2010-02-24 14:37:47
I have a 99 GTP with 64,000 miles that I purchased back in 2000, for the past 4 months the ABS and Trac Control light remain on constantly along with loss of ABS and Trac control feature.

Sensors are all good, code indicates it's the Electronic Brake and Anti Loc Control Module which cost approx $1,200 just for the module as quoted by one shop. I found a used one at Morad Auto Parts for $190 (it is guaranteed 1 year).

Besides this forum I have seen quite a few others regarding this same problem...why hasn't there been a recall??? I bought my GTP used so anything I do through a dealer would cost ME!

Once I get it installed I'll do a follow up post.

aaron92 wrote at 2012-11-14 21:19:34
There's no recall because Pontiac has been shut down since the whole economy collapse thing remember?

Nate wrote at 2013-03-13 19:50:55
I've been doing research and most common problem is ebcm.  You can take it to shop n have abs scanned relatively cheap to try n rule out bad wheel sensors, wiring, and hubs bearings. Can get new part but extremely costly better to have rebuilt. New $1000. Rebuilt $160. And if get new have to have it programmed to ur car. Some have had multiple problems but almost all had bad ebcm. If scan comes back couldn't read or no codes ebcm is bad.  

Nate wrote at 2013-03-13 19:53:02
Explains in detail and where to send for rebuild and how to remove and install.

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Kris Walters


I am an ASE certified undercar specialist that can answer almost any questions you have about brakes, steering, suspension, alignment, tires,and exhaust systems. I also have certifications for engine performance and repair, but as this is a hard area to diagnose without personally looking at the vehicle I can only try my best guess.


ASE certifications in Brakes, Suspension/Steering, Engine performance, Engine repair, and Undercar/Exhaust Systems. I have over 15 years experience on most domestic and foreign vehicles.

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