Re: abs/trac off/service vehicle soon lights come on...
Its probably a wheel speed sensor or " " harness. if you replace your hub assembly it will take care of the problem. a new hub will run you between $100-$130. its an easy fix if you have a little mechanical knowledge. i dont know what labor would cost but if you know how to change your brakes you can figur it out.
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The computer system reset every time you turn key off. The system then does a 3 second bulb check to verify all is functioning correctly. If all is well stays off. The reason why it only turns on when moving is because the abs sensors are either not picking up any vehicle speed from one of the wheels or there is a faulty connection in wiring at one of the wheels. Need to have vehicle scanned by a good shop and verify which wheel is causing the problem. If light is on ABS and traction control systems are disabled.
Have the ABS codes scanned. This will get you started in the right direction. Possibility is that one or more of the wheel speed sensors is not working or intermittent - could be wiring or connectors on these as well. Another possibility is the EBCM, Electronic Brake Control Module. I believe the EBCM will throw 1216 code in many cases. THese can be rebuilt online for about $150.00.
The more likely problem is the wheel speed sensors. THese are an integral part of the wheel hub. About $100.00 each for the part. About $250.00 each to have them replaced. They can be tested with an AC voltmeter by spinning the wheel. Also, they should read roughly 850 ohms resistance. The ABS codes will tell you which ones are not reporting.
Guys i have a 2001 buick century. i ran into that problem figured for sure it was a wheel sensor but it wasn't if you can get a friend with a scanner to pin point which wheel it is then you're half way there. you said when you turn the wheel the light comes on well you know it one of the front wheels for sure, i was with my brother one of us was looking at the dash and the other was moving around the connector to let the other know when the light came on lots of posts spoke about the wires breaking at the point where they bend that wasn't the case. sure enough it was the wires going into the connector as you turn the wheel left and right the wire looses contact for a fraction of a second causing the abs light to come on. so check the connectors at each wheel under the cv joints.
hope this helped
good luck guys
The steering wheel position, wheel speed sensors, and ABS systems are all used to provide traction control. You likely have a failure of one or more systems. Scan the ABS system and it will provide codes to help the diagnosis. Wheel speed sensors fail often, and it is likely one or more of these is contributing to the problem.
Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the Check Engine, Service Engine Soon, ABS Or TC lights to tell you that there is a problem and you should have the car diagnosed and repaired. I would take it to a service center you trust and let then come up with a solution. Sometimes a problem in one system will turn light on for other systems that communicate with it, but it doesn't mean there is a problem in all of the systems.
I have this same problem and had it checked. It is the wheel sensor. Mine is the passenger front right wheel sensor. According to the mechanic I take it to the GrandAm's are known for this. The part is about $40.