Speed sensor

The speed sensor light is starting to light up
Every so often lately. A few times the van went
into limp home mode but after re start drove
Normal.The speed sensor light doesn't stay on
continuously but intermittent while driving.
My question is what should I check or do to
Find the problem 06 3500.

Check your tire pressures and check that all the tires are the same diameter.!
There are about the only 2 things (beyond bad or dirty tone rings) that will cause the
traction control light to flash.
Roger