Rust buildup under the front sensors is a common cause of false activation at low speeds. Normal play that develops in the wheel bearings can let the signal strength drop out to where the computer can't read the wheel speed. That is more common on GM front-wheel-drive cars and can occur in as little as 15,000 miles. To find that, your mechanic will use a scanner that displays live data to watch the readings from the wheel speed sensors. Also check for metal filings, (hairy oil), on the rear wheel speed sensor. That can reduce the signal strength, especially at low speeds.

Answered by caradiodoc (expert)
17,324 answers provided

new hubs with the sensors were installed ...still have problem

Response from mckpcs
2 questions asked

You didn't say anything about new bearings. What about the rear sensor? Have you checked it for a muddy buildup on the magnet?

Answered by caradiodoc (expert)
17,324 answers provided