Question about 2003 GMC Yukon XL

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After hitting a bump or pothole, my vehicle automatically locks/unlocks all the doors, the ABS light comes on and the service brake system message appears, along with a ding sound, what could cause this?

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Hello. you have either a poor solder joint or a loose connection within the systems effected. The best route to go is this. look in the yellow pages under auto electric repair shops. have them put your yukon on their diagnostic equipment to pin point the problem. J.

Posted on Jun 07, 2010

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Posted on Jan 02, 2017

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To troubleshoot these issue,i suggest you to refer the help links provided below.There are direct links with accurate solution,for these specif issue.

Click the link below and follow the procedure:------

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http://howtobyme.blogspot.com/2011/11/abs-and-service-light-comes-on.html

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Battery Light and ABS Light on Dash http://whoisbyme.blogspot.in/2012/07/battery-light-and-abs-light-on-dash.html

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http://technoanswers.blogspot.com/2012/01/anti-lock-brake-light-stays-on-all-time.html

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http://repairhelpcenter.blogspot.com/2012/01/abs-light-comes-on-and-car-makes.html

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These details will help.
Thanks.

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1 Answer

Why are my brakes locking up and grinding whenever i hit a bump or uneven surface while braking?


Sounds like you have a speed sensor signal dropping out. This would cause the ABS system to falsely think one of the wheels has locked up and would turn on the abs to unlock the wheel.

You can visually check the wiring harnesses to the speed sensors to see if there are any corroded connections, corroded wires or broken wires. If everything looks good than the next step would be to drive it with a scan tool and watch ABS data. You should be able to spot the speed sensors that drops out on the scan tool when the problem occurs. Than you can focus on that wheel to see what the problem is.

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1 Answer

The trac off, anti lock and service vehicle soon lights come on usually when there is a significant bump or pot hole in the road. They then stay on till the engine is shut off not coming on again till the...


i think you just have a bad abs sensor, most times when a mechanic checks a sensor they will tap on it to see if a warning light comeson or goes off, since you say it only does this when you hit a bump or pothole i dont believe anything is wrong, as long as your not hearing or feeling anything unusual i wouldnt worry about it, although i know a light coming on telling you something is wrong can be very annoying

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While on hilly road with lots of bumps and potholes, brakes fail


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I will bet the check engine light comes on as well?

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I have a 1999 Dodge Ram 2500 pickup, ABS & brake indicator


These are extremely complex systems and more likley than not, there is nothing wrong with the abs system. If you don't feel a pulsing force against your braking foot pedal, than you've got nothing to worry about than getting the dealer to clear the code in the abs control box. Again, if you feel NO changes in your braking system what probably happened is when you hit the bump/pothole one of your wheels went slightly faster than the one opposite it and the abs kicked in for a split second therefore storing a code.

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I have had the EXACT same problem with my 03 Chevy Tahoe!!! I have yet to find out the solution!? I cleaned all my grounds and changed my rear speed sensor along with bench tested my alternator! Have you found the problem? I would be very grateful if you could hit me back with an answer!! Thanks

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