Compression Ignition Addict
Join Date: Dec 2007
Thanked 233 Times in 224 Posts
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It's usually one of the three sensors (LF/RF-Rear) that stops communicating with the module. You can use an Ohm Meter to see what the resistance value of the fronts are by unplugging them, back behind that little "mud flap", to tell if it's one of those. It should read in the neighborhood of 700 Ohms.
Often, when the rear sensors stops working (in the center of the diff at the top) you also loose the speedometer...
Other than that, you would need to get it on a good diagnostic scanner, to retrieve the code, to know what's wrong.