Engine, VSC, Trac Off lights are on?

OLLENAS

MEMBER
2010 TOYOTA SIENNA
6 CYL
AUTOMATIC
177,000 MILES

The Engine light, VSC light, and Trac Off lights keep coming on. Sometimes it goes away, but eventually it comes back. The van seems like there's a lack of power, poor throttle response, and when that happens that car just stops sometimes and won't turn on, and then 15 mins later it starts. Code P0203 is what the mechanics have told me. I've had the Spark Plus and Coil changed 2 times already. 3 mechanics can't seem to fix the problem. I hope someone can help me with this problem before I go to a Toyota Dealership.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
42,798 POSTS

Here is what is said about the p0203 code:

The P0203 code on a 2010 Toyota Sienna indicates a problem with the fuel injector circuit for cylinder 3. Specifically, it means that the engine control module (ECM) has detected an open or short circuit in the wiring or connector for the fuel injector on cylinder 3.

This code can be caused by several things, including:

A faulty fuel injector - The fuel injector on cylinder 3 may be malfunctioning, causing the ECM to detect an issue with the circuit.

A problem with the wiring or connector - The wiring or connector for the fuel injector on cylinder 3 may be damaged, causing an open or short circuit.

A problem with the ECM - In some cases, the ECM itself may be malfunctioning and causing the code to appear.

So, you might have a bad PCM if the Engine light, VSC light, and Trac Off lights keeps coming on when this condition occurs. But I would check out the injector wiring and then replace the injector first. I have included how to change the fuel injector out in the images below. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

Images (Click to make bigger)