That is what was causing the errors. Whether you pushed the button on purpose or on accident, it disables your vehicles TRAC (traction control) and/or VSC (vehicle stability control) systems. I was driving today with my 2005 Toyota Sienna XLE limited and all of a sudden I got Check Engine Light, VSC and TRAC OFF light. I took it to my local Toyota dealer and they informed me that my gas cap was defective and not making a good seal. Now pressing the button again would turn on both the systems and light will turn off, the systems are re-engaged now. I discovered this after I had finished a visit and was headed home. Once the TRAC OFF and VSC OFF indication illuminates, it means that both the systems have turned off. Toyota dealership wanted $85 to run the diagnostics. whats up bro, I've got a 03 T4R sport my VSC trac, VSC off lights are on also check engine light was on but Auto Zone turned it off and told me cat was bad. What s … read more I have a 2003 Toyota Sienna. When I got home I check the code with my OBDII and found a P0174(System Too Lean [Bank 2]) code. But my mechanic asked me to $700 to repair it. 3 days back (after 200 miles drive) I found both the lights - Check engine and VSC in ON condition. I have a question. I recently had a similar issue In making a short turn on gravel the tire spun a bit and shortly after the VSC and check engine light came on. 0. If you notice the TRAC OFF light come on your Toyota dashboard, that means you have pressed the TRAC OFF button, likely located on the left side of the steering wheel. ... VSC automatically turns off by default with a check engine light/condition. HI! Local repair shop ran diagnostics for free…said I had a small emission leak…we replaced the gas cap and the shop turned off … Check engine light and VSC light on 1 Answer. On some vehicles, the “skidding vehicle” or “TRAC OFF” light may also be lit as well. Autozone told me the trouble code is P0135. It runs smooth. The VSC, TRAC OFF and CHECK engine light came on. My Avalon check engine light, vsc light and vsc off light came on following me driving through about 4 inches of water on the road. I have pre-owned 2006 Avalon Limited with 78k miles on it. Most Toyota owners will find that when the Check Engine and VSC lights are lit, there is a problem with an O2 Sensor or gas cap. The lights stayed on the entire fifty mile trip home. I have at 2005 Toyota Highland with 175,000 miles. Sometimes the VSC OFF light doesn’t get off, and you can still see it lit; it could be because of some issues with your system. gfoster1 Posts: 1. I observed the van but no unusual driving condition detected. Its check engine, VSC and trac off lights turned on a couple of days ago. VSC VSC off & Engine light on I just had this same thing happen on my 2001 Toyota Avalon with about 82,000 miles. It is likely that “Traction Control” will not work while this light is illuminated. 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