Most likely a relay is stuck. Remove ABS fuse and re-insert, see if that stops the problem, at least temporarily.
If so, then replace relay.
If ABS light is on, then have system scanned by trusted garage with chassis scanner ("C" code).
While most autoparts stores will scan the PCM ("P" codes). They cannot scan chassis codes.
Wednesday, February 18th, 2009 AT 7:05 AM