6 Reasons Behind Pre Collision System Malfunction Toyota Problem And Their Fixes

Why pre collision system malfunction Toyota? One reason behind this malfunction is debris build-up on the camera. Other reasons include dirt on the sensors in the front part of the vehicle, defective airbag sensors, FCW error, and dirty speed sensors. Fixing pre-collision system malfunction in your Toyota vehicle’s system can be extremely complicated.

So, to make your job easy, we have come up with 5 reasons and their solutions to this problem here. We can declare that after taking the help of these solutions, you can easily fix the pre-collision system malfunction on your Toyota vehicle. So, let’s get started with the main discussion without delaying proceedings.

Why Pre collision System Malfunction Toyota

Let’s have a glance over the quick chart below-

ReasonsShort Solutions
Debris build-up on the cameraWash the camera thoroughly
Dirt on the sensors in the front part of the vehicleWash the sensors, and if it doesn’t solve, then replace them
Defective airbag sensorsReplace the airbag sensors
FCW errorTake your car to the service center
Dirty speed sensorsClean the speed sensors
Dirty windshieldClean the windshield

In the below guide, you will get a detailed oriented discussion on the reasons behind this problem. And get to know how to do a pre collision system malfunction Toyota fix.

Debris Build-up On The Camera

A common reason behind the pre-collision system malfunction is debris build-up. Sometimes you can see a black and white display, defocused pictures, and no clear indications on your 2019 Toyota 4Runner car.

This problem also happens for the debris build-up on the camera. In addition, the view from your front camera will be blocked for this reason.

Solution: To solve this pre collision system malfunction Toyota 4runner issue, you have to wash your camera thoroughly. You also need to make sure that you wash your car and the camera more often.

Dirt On The Sensors In The Front Part Of The Vehicle

Many people have stated that they have faced a pre-collision system malfunction Toyota rav4 issue in their 2018 rav4 Toyota car. This problem can happen if there is excessive filth or dirt on sensors placed in the front part of your car.

Solution: In this case, you have to wash the sensors placed in the front part of your car to solve the problem. If the problem is still not solved, you are required to replace the sensors.

Defective Airbag Sensors

It is sometimes difficult to tell the exact reason behind a pre-collision system malfunction. A random reason is a bad airbag sensor. It will stop the smooth functioning of your Toyota vehicle.

Solution: To solve it, you are required to replace the faulty airbag sensor.

FCW Error

Sometimes, you can see that the FCW light of your Toyota car is illuminated, but no one stops suddenly in front of you. The full form of FCW is Forward Collision Warning. The FCW light when somebody stops unexpectedly in front of you, the car presses the brakes for you. In this case, you will also face the pre-collision system malfunction issue.

Solution: In this case, you are required to take your Toyota car to the service center and get it fixed.

Dirty Speed Sensors

If you find out that your 2018 Toyota Tacoma car’s pre-collision system is not working, but the truck is driving fine, your truck’s right front speed sensor may be covered with dirt and debris.

As a result, it affects the pre-collision system and does not allow the pre-collision system to function. It is not normal that any dirt and debris will go into your truck’s right front speed sensor, but it will create massive problems when that happens.

Solution: To solve this pre collision system malfunction Toyota Tacoma issue, you have to clean the dirty right front speed sensor.

Dirty Windshield

Sometimes, you can see the check engine light come on in your 2020 Toyota Camry SE car. In addition, you will see some texts for Secondary Collision Brake System Malfunction and Pre-Collision System Malfunction. When you drive this car, it will shake and vibrate extremely violently. All these problems can happen if you have a dirty windshield.

Solution: To solve this pre collision system malfunction Toyota Camry 2020 issue, you have to clean the dirty windshield.

A Helpful Tutorial You May Need!

Frequently Asked Questions (FAQs)

What is Toyota Pre Collision System?

It is a safety feature of Toyota. This system functions by using sensors to monitor the street in addition to your surroundings. The Toyota Pre Collision System gives off audio and visual warnings if there is any possibility of a collision. These warnings are given by using your Toyota car’s built-in camera or radar.

Why is my pre-collision light on?

When your pre-collision system light is on, there is a malfunction in the system. The alarm light indicates that there is a fault in the system. In addition, the alarm light will function as it should, even while the pre-collision system isn’t performing well. The light will flicker quickly when the system is working correctly. The light would flicker while you fail to use the system provisionally as well.

Can Toyota Safety Sense be turned off?

Yes, Toyota Safety Sense can be turned off whenever you like. However, you will find out that the Toyota Safety Sense will turn itself back on after every ignition. You need to keep in mind that Toyota Safety Sense doesn’t identify pedestrians, and there are particular conditions where the laser might not function correctly. For instance, in adverse weather situations and sharp terrain.

How can you reset Toyota PCS?

Firstly, press the pre-collision system switch for three seconds or more. You will see that the pre-collision system warning light is turned on, and a text is shown on the multi-info display. Now, press the pre-collision switch again to reset the Toyota pre-collision system. The pre-collision system is turned on whenever the engine switch is turned to IGNITION ON mode.


You might get very annoyed when you see a message for Pre-Collision System Malfunction on your Toyota car. It might be more annoying when you don’t know the reasons behind this problem and how to solve it. Though your Toyota vehicle might drive well, you need to fix this problem as soon as possible.

Else, it may cause you some other issues soon like extreme shaking and vibrating of your Toyota vehicle. To help you solve this issue, we have come up with 7 reasons and their solutions behind this problem. We are hopeful that you can now solve the pre collision system malfunction Toyota problem.

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Ronald Berit

Our chief editor, working 24/7 to ensure the precise and only quality data regarding different trucks.He is mastered with the ins and outs of cargo to off-road trucks of Dodge, Ford, Chevy, Toyota, GMC and more. This truck geek graduatedwitha Bachelor of automobile engineeringdegree and practiced through his own automotive parts repair center.

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