TRAC light

Hello, I have 2000 GTP, 30k. When it rains heavy or I take car to get washed the TRAC light comes on. After driving for few miles and I shut it off and fire it back up light is off. Sensor getting wet? Thanks

The problem is which one? There are four. Common problem is the electrical connector at the hub for the wheel sensor gets loose or water intrusion due to a bad seal. Remove the electrical connectors and check the seal. Also, use electrical contact cleaner to remove any corrosion and water.