Last post on Dec 11, 2013 at 12:34 PM
You are in the Pontiac Grand Prix
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Pontiac Grand Prix, Car Safety, Sedan
#105 of 215 Re: Traction/ABS systems...among other things! [aschoen]
Apr 19, 2011 (10:04 am)
I decided to go to my mechanic and see if he can find the problem thats causing my ABS to pulsate and shutter at slow speeds and slow turns. (also the ABS and Traction Control Service Lights go on, just like with everyone else) well he found a code C0040 RF Wheel Speed Sensor Circuit Malfunction. So he changed the Right Front Wheel Hub. (it was all rusty inside) (i got the Timkin Hub) The problem is still there even worst now the ABS shutters on the first turn i make and the light go on instantly and my abs turns off and i have no abs during braking, so in the rain my wheels lockup and the car skids. I really do not feel like changing all the wheel hubs since its so expensive. So i hope some one can help me. I have a 2004 Pontiac Grand Prix GT 130k
Im glad i was able to help some people here with the Stalling situation.
#106 of 215 Re: Traction/ABS systems...among other things! [mishken84]
Apr 19, 2011 (11:34 am)
Have the dealier check the ABS control (computer) module (in engine compartment). that is what is is wrong with mine (2004 Grand Prix GT - 115K miles). I unplugged it as it costs over $1000 to replace and I'm not spening that much on this car. the lights stay on in car dashboard (including brake light) but ABS has quit coming on and off when it shouldn't.
#107 of 215 Re: Service Traction/Stability/ABS System [gmcustsvc]
Apr 20, 2011 (2:52 pm)
GM mechanic since 1983. 99% sure it is a wheel speed sensor harness at the front hub-sensor assembly. Can get harness online or at advance auto parts. Dooman part #970-042. This is for 2002 Pontiac Grand Prix
#108 of 215 Re: Service Traction/Stability/ABS System [mike5858]
Apr 21, 2011 (7:30 am)
I'm sure you good mechanic, but I had my wheel speed sensor harnes at front hub sensor assembly changed - it didn't help.
#109 of 215 Re: Service Traction/Stability/ABS System [ecugirl81]
Apr 21, 2011 (7:57 am)
I apologize you are having concerns. Have you tried speaking with a dealer?
GM Customer Service
#110 of 215 Re: Service Traction/Stability/ABS System [mike5858]
Apr 21, 2011 (9:19 am)
Thank you for your assistance. Vehicles can be hard to diagnosis over the internet. It is recommended to visit a local dealer.
GM Customer Service
#111 of 215 Re: Service Traction/Stability/ABS System [gmcustsvc]
Apr 22, 2011 (6:06 pm)
"Vehicles can be hard to diagnosis over the internet. "
Uh, excuse me, but I disagree. The reason I am on here tonite is that my daughters came home for the holiday weekend with my '01 Grand Prix GTP (131k) that they are using at college. They complained that the car was "shaking". I had previously replaced p/s pumps (twice) as well as injectors, coils, etc. that caused poor performance, misfiring and rough acceleration. I thought that was what they were describing. I test drove it a couple of hours ago and found the ABS and Trac lite came on with rough "shaking, especially at low speeds. Puzzled by what it could be, I got on the internet and in 15 minutes I find the likely cause of the problem and lo and behold it is a common problem.
Now, it is fair to say that I cannot say for sure EXACTLY which of the components discussed online are the problem on my car, but I do know where to start and will start diagnostics in the morning. I have already replaced the LF wheel bearing (including sensor) over a year ago, so I know the symptoms when a bearing goes bad. I don't think it's my bearings and will start with looking at the the speed sensors and harnesses. Last thing to replace will be the ABS computer and I may just leave it off, as others have suggested.
And the original comment: "Vehicles can be hard to diagnosis over the internet." makes me laugh. It can't be any worse than paying a GM dealer who has the benefit of training, diagnostic aids and service information from the manufacturer big $$$ only to find out the problem is NOT diagnosed correctly and fixed. Plus a dealer will consistently deny that it is a common problem (BTDT with LIM on Grand Prixes). GM (and their dealers) could get away with this years ago when there was no way for owners spread across the country to communicate. But the Internet and these forums are a huge benefit to those who can't afford to just take the car to a dealer and write check that sometimes is larger than their mortgage payment for REPAIRS to a car.
And every time I hear about some new "feature" on a car (cameras, memory seats, motorized doors, etc) all I think is "how much will it cost when THAT breaks?"
So, yes, Virginia , there IS a Santa Claus, but it's not GM, it's the Internet.
#112 of 215 Re: Service Traction/Stability/ABS System [jml755]
Apr 23, 2011 (5:24 pm)
I got a Timken hub locally today ($117). Was going to replace both fronts but they only had one. I had replaced left front last year (but not a Timken) and left turns seemed to be worse than right turns, so I took a chance and took off the right hub. Found the x-mas tree clip that holds the sensor connectors out of the way of the half-shaft had broken and the sensor wire plastic sheath had been rubbing on the spinning shaft and worn away, exposing the 2 wires inside. The insulation on the 2 wires was still ok, but when I removed the hub I found that one of the wires had broken right where it enters the hub. No way to solder that back on. Suspect that the loose assembly had caused the wire to constantly vibrate/flex and finally break.
Had to heat up one of the 3 bolts that holds the hub on with my oxy/acet torch and accidentally melted the HARNESS connector. Darn (not exactly what I said). Got the new hub on and scraped enough melted plastic away from the connector to plug the new hub in. (Will get a new harness monday, $38). Took it for a test drive and NO ABS or TRAC lite! Yippee. But...... power steering fluid all over the floor. The drivers side boot on the steering rack was leaking fluid. Looks like a new rack & pinion steering gear is next weekend's job.
But thanks to this forum, I got pointed in the right direction very quickly and for $117 solved the problem (oops, forgot to add the new harness cost, ok under $160).
#113 of 215 Re: Service Traction Control/ABS [aschoen]
May 06, 2011 (6:02 pm)
The guys not trying to jip you from what i can tell.if you have any other problems then the wheel bearing/hub the diagnostic test most likely won't read the issue causing the abs/traction lights from staying on.the wheel bearings on the back tires don't have traction control.so replacing it with an aftermarket hub doesn't make a diffrence.paying 500 dollars to get a new hub assembly installed seems really steep to me,but keep in mind your gonna pay top dollar the the namebrand,just like anything else.find a mechanically inclined friend to do it for a case of beer.i've replaced a few hub assemblies myself and it's not technical or very time consuming,usually takes about 45 minutes tops.another easy quick way to see if an after market hub assembly will work for your front end is to go to auto zone and purchase on for 130 to 150$ and disconnect your plug to your hub assembly,(located on the bottom/inside of your fornt tires,very acessable)and plug the store bought one in and check your abs/traction lights.make sure to check both sides lol,if it doesn't resolve the problem return the hub.or it might be a problem in your wiring,can'[t help you there lol good luck
#114 of 215 Re: Service Traction Control/ABS [gmcustsvc]
May 25, 2011 (6:54 pm)
I too am having the same issue with the "service traction control/ABS" lights coming on with the pulsing and shuddering, feeling like the ABS is kicking in when it shouldn't. I understand under some constraints that it should be looked at by a GM tech, but when the issue has no explanation to solve the problem except throwing money at it, well that just seems wrong. Especially having to pay for the diagnosis that there's no explanation. For the stalling issues, I will be cleaning the throttle body, as that seems to have worked for several people on this forum. With the braking issues, it seems to me that GM should take note of forums like this and address the problem and help it's customer. Negative publicity is not good for business. Christina, what is your email so I can get more information. Thanks