Trac off light is on and check engine light is on, toyota yaris 2012

SOURCE: my check engine trac off light came on

This happened to me as well, just a few weeks after buying our 1999 ES300. Took it into Lexus for regular maintenance and to check this out. Apparently, if you don't replace the gas cap correctly and tight enough this can cause the 'trac off' light to come one. It will go off a little while after the cap has been replaced correctly. This also happened with my 2006 Murano, 'check engine soon' message.

ROBERT GARCIA

• 926 Answers
• Posted on May 03, 2009

SOURCE: Why is the vsc light check engine light and trac

to reset for a momentany malfuntion,disconnect the negative battery terminal few minutes, reconnect,start engine and drive to check

SOURCE: toyota 2001 4 runner vsc lights on and trac

Those lights always come on whenever the check engine light is on.It could be from the gas cap not being tight enough or an air hose in the engine compartment coming loose. I recommend bringing your vehicle to someone that can read the codes and reset the lights for you. The codes will narrow down what the problem really is.

SOURCE: 2004 Toyota 4Runner, Regarding The VSC TRAC and VSC OFF lights

Check your switches for the VSC, some get bumped on (due to their location) and some get stuck in the "on"position.

SOURCE: On my Toyota Sienna 2008, my check engine light,

On most Toyota's that are equipped with Cruise Control (Vehicle Speed Control or "VSC") and with Traction Control System (TCS or "Trac") all of these lights will come on at the same time if the Engine Control Module (ECM) determines that there is a fault in the engine management system that 1. Prevents the engine from being properly controlled. 2. Prevents the VSC from being properly controlled 3. Prevents the TCS from being properly controlled 4. Any combination of items 1,2, and 3.
Most of the time it is caused by a single fault in the engine management system. Fault codes are codes that are output by the ECM to let a diagnostician know which of the many systems, that are monitored by the ECM, is malfunctioning. To find out what the actual cause is, you must scan the ECM for fault codes then use this information to begin diagnosis of the system that the fault codes point to.