Just noticed yesterday on my wifes Pilot that the VSA triangle light is on at start up. Then once I get up to about 30 the VSA light come on like I pressed the button in. But the button wont do anything. It was fine untill my buddy was messing with his new scanner and checking all the stored codes. All were low tire pressure lights. He cleared those and turned the car off. Then when I left I noticed the lights on. The car doesnt have any codes or a check engine light.

 

This is probably why people hate TPMS in the tires. Not saying your situation is like mine, but this just recently happened to my Accord. I reset it. Check the tire pressure. So far, the light has not come back, 3 driving days now.

 

There are two VSA indicators: the triangle (to indicate VSA activation) and the words VSA (system indicator). Which of those is lit up?

 

The triangle is lite up at first. Then once the car reached 35 mph the VSA light comes one.

 

I don't have a Pilot but, I do have VSA in the Odyssey and looking at my manual it says one of the reasons it would do that is "The vehicle is subjected to an electrical signal disturbance". Which makes me think he could have possibly fried the VSA modulator control unit with the diagnostic tool. Stranger things have happened.

 

Take the negative cable off the battery for 30 seconds and reconnect. See if that clears the issue.

You will probably have to re-enter your radio security code and will lose your trip meter info, etc.