Ok, here's a new weird one. We had a tire replaced a few months ago. Everything was fine. But then going around a certain curve on the county road we live down would cause the "Service ESC" light to come on, and sometimes the traction control to turn off. Steering always felt fine. But only for 30 seconds or so. By the time we get to the end of the county road, eveything is back to normal. It only happens during the left turn on that curve (leaving the house - coming home when you turn right, no issues). It stopped after a while, but then we got another tire replaced, and it has started again. And now it is occasionally coming on during city driving, straight line, usually right before a red light as I am slowing down.

My OBDC scanner never showed any codes when it first started doing this. I will probably scan it again this weekend if it keeps doing it.
Any thoughts?

Thanks.

 

Look at the abs wire connectors on both sides are they clean and connected firmly?



Connection at end of the wire, #2 in this diagram

 

The computer is sensing that one tire is rotating at a different speed from the others. Could be the sensor or wires, inflation, mismatched physical sizes, hitting a gravel patch with one tire, one brake grabbing etc.
You will only get codes when the lights are on, the ABS codes don't save.

 

And not all code readers can read ABS and SRS systems.

 

Could be a bad sensor that bungles only when stressed a certain way, a bad or corroded wire or connector. Wire can be damaged or corroded inside even if the insulation looks fine. Dirt in the sensor can cause trouble. (There's a TSB on this. The fix is to carefully clean it out.)

 

Sometimes when I plug in my code reader it causes the red "brake" light, as well as traction control and ABS lights on the dash to light up. So the problem could be in the OBD port. If I plug in very carefully and gently, it won't cause the problem.

 

There is a TSB about that. The resolution is non-factory parts are "bad".