# Pontiac Grand Prix & ABS

**URL:** <https://community.cartalk.com/t/pontiac-grand-prix-abs/50668>\
**Category:** Maintenance/Repairs\
**Tags:** pontiac\
**Created:** [June 21, 2010, 6:23pm UTC](https://community.cartalk.com/t/pontiac-grand-prix-abs/50668 "2010-06-21T18:23:15Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![carhelp199](https://avatars.discourse-cdn.com/v4/letter/c/3be4f8/32.png) [@carhelp199](https://community.cartalk.com/u/carhelp199)\
**Post date:** [June 21, 2010, 6:23pm UTC](https://community.cartalk.com/t/pontiac-grand-prix-abs/50668/1 "2010-06-21T18:23:15Z")

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My daughter has a 2002 Grand Prix. Last week the ABS & Trac light came on for a short time. It ran a self-test & the light went off & didn’t come back on. A few days ago, it came on again, but went back off. A few times while braking, it feels like brakes a grabbing a bit. Took it to repair shop & they said no codes show up. They drove it around quite a while & couldn’t get it to do anything. They said something triggered the ABS to engage. Any ideas? Thanks

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**Author:** ![Bladecutter](https://avatars.discourse-cdn.com/v4/letter/b/aeb1de/32.png) [@Bladecutter](https://community.cartalk.com/u/Bladecutter)\
**Post date:** [June 21, 2010, 10:05pm UTC](https://community.cartalk.com/t/pontiac-grand-prix-abs/50668/2 "2010-06-21T22:05:35Z")

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How old is the battery in the car?

I had a similar vintage Buick Park Avenue, and when the battery was on its last couple weeks of reliability, the same thing happened with my brake/abs lights.

Also, when was the last time the brakes had a full fluid flush?  
There might be debris in the lines that is affecting the ABS modulator assembly, and causing a valve to stick open on occasion.

BC.

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**Author:** ![carhelp199](https://avatars.discourse-cdn.com/v4/letter/c/3be4f8/32.png) [@carhelp199](https://community.cartalk.com/u/carhelp199)\
**Post date:** [June 22, 2010, 12:56pm UTC](https://community.cartalk.com/t/pontiac-grand-prix-abs/50668/3 "2010-06-22T12:56:10Z")

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Thanks, that will be something we will check.  
Have a good day.

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [June 22, 2010, 4:15pm UTC](https://community.cartalk.com/t/pontiac-grand-prix-abs/50668/4 "2010-06-22T16:15:32Z")

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I would also just pull and clean all of the electrical connectors for the wheel sensors. I had a similar intermittent problem on a GM and I seem to have cleared it up by doing this. One of the sensors had gotten caked with grease from a torn CV boot, but in general I’ve found my own GM electrical connectors to be easily disturbed (very much unlike the ford & dodge that I also own).

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**Author:** ![Repairlady](https://avatars.discourse-cdn.com/v4/letter/r/f475e1/32.png) [@Repairlady](https://community.cartalk.com/u/Repairlady)\
**Post date:** [July 24, 2010, 3:50pm UTC](https://community.cartalk.com/t/pontiac-grand-prix-abs/50668/5 "2010-07-24T15:50:12Z")

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Have your repair person check out your speed sensor wiring harness. Should be able to replace part and labor for about $260.