I have a 2002 2500. When I slow down by putting light pressure on brakes and "coasting" to a stop, it sometimes feels like ABS engages just prior to vehicle stopping.Any ideas?Thanks.

 

Quote:
<table width="100%" border="0" cellspacing="0" cellpadding="6"><tbody><tr><td class="alt2" style="border: 1px inset currentColor;"> Originally Posted by madman76
The traction control system on my 03 Tahoe activates for no reason. It only does it from a complete stand still, if I ease off the throttle for a second it shuts off and I'm good to go. This doesn't happen all the time either but often enough to be a pain. I'm leaning toward the problem being a wheel speed sensor but I'm not sure. I don't know how to test this or how to figure out which one it is. Please help if you can.
</td></tr></tbody></table>you are correct. it is a wheel speed sensor. the signal is dropping out and the tcs thinks a wheel is locking up so the abs cycles a dump valve. the signal is weaker at slower speeds so falls out only during slow speed operation.
the only way to locate the fault is to take a snapshot with a scan tool of the event when it occurs. the snapshot is uploaded to a pc and plotted. the signal that falls out is then evident. replace that wss. <!-- / message -->
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There's a recall out for corrosion of the WSS. My '01 Burb was covered by the recall. Not sure if it was only half-ton trucks, or included 3/4-tons as well. The recall was several years ago, and I had the repair work done for free. Might want to check your local dealership.

 

Thanks for the replies. I ordered a set of speed sensors. Is it an easy DIY job or did I jump the gun?

 

they can be hard to get out without breaking. depends if you live in the rust belt.
not sure if you have a 3 or 4 channel system.

 

Thanks for the replies. Changed driver side front sensor. Seems to have solved the problem.