ABS, TRAC OFF, SERVICE ligth on simultaneouly

when I was driving on high way, 3 light came on simultaneouly. And the lights went off when i retarted the car on the shoulder, but on again soon after retuning to highway.
after home, let it cool for a while, the lights did not come on again, went to a garage, the mechanic said he had no way to find a problem as long as the lights are off now.
Any idea what kind of problem this is?
Thanks

Same thing happened to me, Check the VSS on the transmission near the passanger side has a purple and yellow wire( depending on vehicle)
Mine had a shredded wire and exposed connection causing the lights to come on and crazy shifiting

sound like vaccum leak. depending on year and size of engine. appears to be part of vaccum system. to find leak spray starting fluid on hoses until you get a drop in rpms. this will tell you what hose if any is leaking. and will not harm the engine.

lights back on again after I drove about 30 miles on highway, but off again when car is cool. Bad connection due to heat? But where? Thanks for any suggesion

please post engine size, vehicle, and year. but could be coolant tempature sensor. does car overheat or does it stay normal?

please post engine size, vehicle, and year. but could be coolant tempature sensor. does car overheat or does it stay normal?
car acts normal except lights
2000 chevy cavalier, 32K now