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PostPosted: Fri Nov 12, 2010 4:03 am 
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Year and Trim: 2002 Pontiac Bonneville SSEi
I have a 2002 Pontiac Bonneville SSEi with over 177k miles. Within the past couple of months it has developed a problem where intermittently it will apply its brakes when turning left or right at low (under 10MPH) speed. This only happens in town and it shows no symptoms when going 60MPH down the highway.

Does anyone have an idea on what could be wrong or what to look at? My father-in-law has a service shop and I don't believe he recieves any code on the scanner. He has taken it to another shop in town but they don't have any ideas. At this point my FIL wants to disable the ABS system, which I'm a bit worried about not having in the winter.

Thank you.


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PostPosted: Fri Nov 12, 2010 10:15 am 
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Its probably a problem with a wheel speed sensor or wiring, but you have to get it scanned with a Tech2 (dealer) or similar to know the exact code and for which wheel.

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PostPosted: Fri Nov 12, 2010 11:42 am 
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I agree. The most likely suspect is one of the rear wheel speed sensors, but any of them, or the various other sensors for the system can cause the problem. The only way to know for sure where the problem is, is to have it scanned with a scanner capable of reading those codes.

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PostPosted: Fri Nov 12, 2010 11:45 am 
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How long has "Service Stability System" been coming up in your driver information center?

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PostPosted: Fri Nov 12, 2010 8:21 pm 
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00Beast wrote:
How long has "Service Stability System" been coming up in your driver information center?


I suspect it hasn't thrown it yet. The system is still activating. I would think that once it determines there is an issue, it would stop trying to activate the system. It hasn't yet figured out there is an issue yet. I wonder if you can unplug the steeringwheel position sensor, or the yaw sensor to disable the system, and still retain the ABS.

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PostPosted: Sat Nov 13, 2010 3:23 am 
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I'd disconnect the yaw sensor. The SWPS is a BEAR to get at. On mine, it would do the shuffle with the brakes, then realize it didn't know WTF was going on, then trigger the light. It's progressed to throwing the light almost instantly when I turn the car on. I need to get my SWPS fixed...

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