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Why do my ABS light stays on once in a while when start the car.

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You could have a problem with the vehicle wheel speed sensors they are right the tires and can get road debire and dirt in them .
Try removeing the front wheels and get a spray can brake cleaner and clean them likely stop this problem.
This is where the ABS gets its signal or refferance voltage from .

Posted on Apr 02, 2015

  • Jeremy W.
    Jeremy W. Apr 05, 2015

    If the lights comes on when you start the car and stays on after the car is running the ABS system has failed its self check. This is not caused by dirt in the sensors.


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Posted on Jan 02, 2017

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SOURCE: abs light stays on

you could have a bad wheel speed sensor,you would need to bring this to a shop or dealer that can access the on board computer to see which one is bad,or look for broken wires at the wheel speed senors on each wheel.

Posted on Mar 29, 2009

  • 259 Answers

SOURCE: ABS light stays on but car stops normally.

it sounds like a lot of seperate problems with the abs light just check to make sure there is plenty of brake fluid in the resovior what causes the metal to metal noise ??

Posted on Apr 25, 2009

  • 3600 Answers

SOURCE: ABS light stays on when the car is started .

the abs light can be on because of a faulty wheel sensor or drive-line sensor, when the ABS light comes on the car goes into emergency mode which means it will work like standard brakes and will lock up the wheels, the ABS is disabled so to check it you need to have an ohm meter and test each wheel to see if the wheel is putting out 2.5 volts on each wheel DC. if not that wheel has a problem either the senor got broke because someone ran over something and broke it off or the connectors are full of mud and can't make contact so unplug them and clean them one by one if you find one that is broken replace it turn the key on and off to the run position 5 times then start the car and drive the light should go off it that fixed the problem, if it does not then it needs to be looked at by someone who knows anti-lock braking systems as they are computerized have high pressure and can cost a fortune if you don't know how to test them properly, I suggested the test for the wheel sensors as this is the most common cause so if yo unhook the connector to each wheel and jack up that wheel so you can turn it you can test it for voltage at the sensor ring, with the test meter on 5 volts DC you won't damage anything so that is as far as you should go unless you buy a subscription to all-data for your car and read all the information on the abs system, if you wish to do so and see the recommended price for parts and labor then go to

Posted on May 29, 2009

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Any time the ABS light is on the traction control light will be on and the system will be disabled.

The ABS light is on because the ABS computer has detected a fault either in its self check if the light comes on at start up and stays on or when the vehicle is moving, the light will come on at start up then turn off and then come back on after the vehicle is moving.

The best advice I can give is have the ABS computer scanned for codes. This will give a good direction to head into to solve the problem. A high end muti-function scan tool or a ABS specific code reader will be needed to do this.

Once you know the code(s) post them and I'll be happy to help you further.

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The ABS module does a self check every time you start the vehicle. If it detects a problem during that self check the ABS light will stay illuminated and a code or codes for the fault will be stored in the ABS module. Scanning the module will allow you to pull the codes and proceed with diagnosing why the fault is occurring.

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