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The following lights came on just as I got off the freeway:

The following lights came...

The following lights came on just as I got off the freeway: malfunction/check Engine indicator, VSC warning and the TRAC OFF indicator. I just got to work, will I be able to drive it home, 25 miles away after work?

Mechanic's Assistant: Does the light stay on, or does it blink?

It stays on

Mechanic's Assistant: What is the model/year of your Toyota?

Sienna/2008

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

No, my husband nor I are car mechanics, have not tried anything - just got to work

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No, that's it - can I still drive it on the freeway to my home 25 miles away?

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Answered in 1 minute by:
3/13/2018
Ron Z.
Ron Z., - Toyota Tech -
Category: Toyota
Satisfied Customers: 19,941
Experience: 18+yrs experience. State Inspector and Toyota Diagnostics
Verified

Hi! Welcome to JustAnswer. Thanks for coming! I'm Ron and I'll be working with you on your question today.

Are you experiencing any engine performance symptoms like skipping or lack of power?

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Customer reply replied 4 months ago
no

Ok, Great! Thank-you! Please give me one moment to type out some info for you. Sit tight one minute... I'll be right back!

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When the Check Engine light comes on, the VSC and Trac lights are also set, which turns these systems off. This is a self-preservation mechanism, in case the reason the Check Engine Light is on can harm or effect the VSC or Trac systems. So- fix the reason why the Engine Light is on, and the VSC and Trac systems will come back online.

When the Check Engine light comes on, this is the on-board computer's way of telling you it sees a problem in one of the monitored systems. Unfortunately, there are literally 100's of parts and sensors monitored in various systems, and to take a "guess" as to which part/sensor in which system is faulty, is virtually impossible. However, if you are not experiencing any drivability issues such as skipping, stalling, shifting problems, etc, then more than likely, the problem is going to lie in the EVAP (emissions control/recovery) system. Very commonly, this could be a faulty, loose or missing fuel cap or even putting fuel in while the vehicle is running can set the light. Check the underside of the fuel cap for any cracks or signs of defects that may keep the cap from sealing correctly. If there are any doubts about the inspection of the cap, replace it. Keep in mind, you will need a cap that meets OE Specs. Those "universal" or "locking" fuel caps sold at after market parts stores do not meet OE specs, and will not seal the system correctly. Check the top of the fuel filler neck for any signs of damage or debris. Check under the vehicle, around the rear areas of the vehicle, looking for any vacuum lines that have dry-rot cracks, holes or loose/missing connections. If these all check out, then the best thing to do at this point is to have the Diagnostic Trouble Codes (aka "p-codes") read from the on-board computer. These p-codes are what is used as a "starting point" for the diagnosis and will tell which part/sensor, in which system, has the fault. Every single Mechanic's first course of action will be to obtain the p-codes. It's standard diagnostic procedure. Once you get these p-codes you can more accurately and efficiently diagnose the problem and then make the correct repair. You can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, O'Reilly's, Advanced, etc).

In the meantime... As long as there are no obvious engine performance issues (like skipping or chugging) or shifting issues, then it is perfectly safe to drive the vehicle.

Please be kind enough to leave a rating for our Q&A using the 'stars' at the top of the page or click 'Accept' when I have answered all your questions. A 5-star rating is very much appreciated! Rating or accepting my answer does not cost you extra.

Ron Z.
Ron Z., - Toyota Tech -
Category: Toyota
Satisfied Customers: 19,941
Experience: 18+yrs experience. State Inspector and Toyota Diagnostics
Verified
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