Last post on Sep 03, 2012 at 6:01 PM
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Buick Park Avenue, Sedan
#418 of 519 Service Stability System
Apr 10, 2008 (8:31 am)
Just recently I starting having an issue with the Service Stability System light coming on. I have associated this light with a braking issue that also just started. Intermittently when braking and starting a turn to the right there is a nasty grinding noise, which sounds like it's coming from the brakes. It will stop once I start to accelerate and pull out of the turn. I took the vehicle into the Buick dealer for service. They replaced the brakes, calibers were reworked, etc. I was told it was fixed but within a day it did it again. I took the vehicle back to the shop and this time they replaced a sensor they said was bad. Now according to what I have read on various places on the web, if a sensor is bad then not only will the Service Stability System light go on, but the ABS light will go on as well as the Traction Off light. Neither of these came on so now I am wondering if the sensor was really bad?
The vehicle is still having the same problems and yesterday it was bad enough that when I released the brake and started to press on the gas (turning to the right) the grinding noise did NOT go away and it actually kept slowing the vehicle down. I had to jerk the wheel to the left before whatever was causing this problem would let loose and I could drive away.
The dealership repair shop has NO clue what is going on. Heck, they didn't even know what the Service Stability System light was for?
Can anyone shed some light on my problem?
Buick Park Avenue
#419 of 519 Re: Service Stability System [fatguyinaz]
Apr 11, 2008 (3:02 am)
The grinding sound may be the ABS/Traction system applying the brake and releasing quickly. It may be doing that even though there's no slipping at that wheel like in a quick start. That may be why it was slowing the car down. For instance in rapid acceleration if the left front slips the brake on the left front is applied to to keep power going to the right front until the left front gets traction.
I saw a post where someone applied dielectric grease to the connections at the sensors on the hubs and reconnected them to reseal them on the fronts and that stopped the service stability system message.
#420 of 519 Re: Service Stability System [imidazol97]
Apr 11, 2008 (2:24 pm)
It's a grind like metal to metal. The 1st thought I had when I heard it was a vehicle that had NO front brake disc left and it was metal on metal. Of course this isn't what it is since we've had all the brakes replaced, calipers reworked, etc.
This only happens intermittently. Picture yourself driving along and everything is fine. Then you must make a right turn up ahead so you start to slow down. You apply the brakes (still all is fine) and once you start the turn to the right the grinding sound starts. Normally, when you release the brake during the right turn the sound and vibration will stop. It was just this last time it happened it did not stop when I released the brake. It even continued to hold when I pressed on the gas. My 1st reaction was to jerk the wheel slightly to the left then back again to the right and it released.
Road surface is smooth, dry, consistent (not loose).
Strange part is it doesn't always happen. I would say it's about 2 times out of 50 it will happen when I start a turn to the right while braking.
The sensor that was replaced was a steering sensor. Least that is what I was told by the Buick repair shop.
A person mentioned the wheel bearing so I have written this down on my list of suspects for the mechanic. It's very difficult to change to a different Buick mechanic. We are in the middle of nowhere, USA and this is the only Buick mechanic service around for 100's of miles.
I would like to thank you for your information. I will continue to watch and hope for more replies with more information. The more the better.
#421 of 519 Re: Service Stability System [fatguyinaz]
Apr 12, 2008 (5:41 am)
From listening, I'd check the connections at the wheel sensors. Pack them with dieelectric grease. Flex the wires to see if there's a break in the wiring that goes to the wheel sensors?
The wheel bearings in the hub could be a problem. But defective wheel bearings give a snow tire like buzz that grows louder and becomes easier to feel through the chassis. And they self destruct as they become worse with driving.
The sensor they replaced is on the steering column and tells the computer where the steering wheel is in its travel so that the computer knows if you are steering in a turn and that the car's not reacting and the VSC tries to apply single brakes in a manner to help turn the car based on what the steering input is requesting.
There are other sensors involved in telling the computer what the car is doing. There is a sensor on the rear package shelf that senses what the car is doing with regard to inertia, for example.
This sounds frustrating. The factors are: it happens when turning to the right; it reacts to flexing/moving the chassis parts left and right; it happens only when braking.
The connectors to the wheel speed sensors are flexed along with the wiring when turning. Does it happen turning to the left?
The streering wheel position sensor also is giving inputs during that time and is being moved when you move the wheel left and right.
The wheel bearing is also being changed in position during the turn and is taking forces differently than normal.
The brake pads and caliper and rotor are involved because you're braking along with the ABS/traction control system. A loose/worn wheel bearing could be letting the rotor and hub move relative to the wheel speed sensor. There's an air gap size that's needed there. If it become greater than it should be the sensor would lose its ability to read correct the wheel speed. It could be thinking the wheel ir turning faster than it should and apply that one brake to slow down the wheel--just like if it were slipping on ice.
I'm not an expert on these systems and I've read a lot of people on forums working on problems, but not quite like yours. Sometimes replacement wheel bearings have been a problem. New isn't always right. Stick with name quality brand if a wheel bearing is indicated.
If you work on your own car, I'd jack up the wheel and move the wheel 3 and 9 o'clock and see if you get looseness and do the same at 12 and 6. Don't move the steering links when you're testing and don't count the ball joint movement that may occur when jacked up. Then do the same on the left side. If there's a difference in amount, then I'd start thinking wheel bearing.
#422 of 519 Re: Service Stability System [imidazol97]
Apr 14, 2008 (7:22 am)
Thank you for all the information. We are taking the car into the shop today to see if they can find the problem. I have printed all the information given to me from this forum and a couple of other forums. Hopefully they will figure it out with all this help.
#423 of 519 Re: Service Stability System [fatguyinaz]
Apr 30, 2008 (10:30 am)
I have waited four years for people to start posting somewhere about this problem. My symptoms are the same and the car has been in the shop 6 times for it the latest time just last week (not fixed)
replace ABS control twice
replace computer once
unable to reproduce systems 3 times even though the car once went home with the mechanic over 100 miles away
if anyone has an answer please email me it or for my phone number to tell me it and I will pay for the answer. I only have 3000 miles left on my warranty and want to fix it once and for all
#424 of 519 Vibration
May 13, 2008 (5:37 am)
It"s NOT the car----it's the TIRES
I too had a vibration on my 99PA. Had the Goodyears removed and replaced with Michelins--------over 35000 miles ago and no problems.
May 13, 2008 (1:25 pm)
Maybe one of you great folks can help. ABS light on, code reads left rear. Replaced assembly in left rear, light still on. (was able to return assembly ). Now looking for short in connections. Any idea where wire connects to ABS system, or for that matter, where ABS system is? I havn't crawled around yet and was hoping for a short cut. Thanks
#426 of 519 2003-05 P/A Ultra Info needed
May 22, 2008 (6:57 am)
I am purchasing a 03-05 Park Ave Ultra and would like any comments, concerns current owners have with their Ultra's Any assistance would be greatly appreciated. Thanks
#427 of 519 99 PA Supercharged Noise @ 1100 RPM only w/AC On
Jun 11, 2008 (5:29 pm)
I have a "bearing sounding" noise when engine is under load (e.g. A/C) at 1,100 - 1,200 rpm only. I've had the A/C compressor replaced and the alternator replaced but still hear the noise (although noise less intense since alternator replaced). So, after about $1,500 worth of repairs, I'm still hearing this noise.
Reputable autoshop (0 complaints on BBB last 3 years) doing work. Took it back after alternator was replaced and had owner and mechanic listen to the noise. All agree noise still present but less intense. Mechanic noticed a brace behind supercharger and alternator was missing and said that probably caused the bearings in the alternator and a/c compressor to fail due to excessive torque and I should have the brace replaced.
Any thoughts on my situation?
Thanks in advance