I have the same problem with my 2003 GP-SE. Did anyone ever solve this? The Trac Off light is ON all the time and the trac button does nothing. My ABS and Engine lights are both off. I thought the passengers side hub was the problem so I replaced it. No change. I plugged a new wheel hub in on the drivers side (but didn't have a time to replace it yet). No change. I inspected the wires and added dilectric grease to the connectors.