4 Causes Of Hyundai Check BSD System Message

For at least two days now, you’ve probably had the Hyundai “Check BSD System” warning light on your dash. The error commonly pops up on cold starts. It displays a warning on the instrument cluster as an orange exclamation mark. That often happens for about 1-5 minutes, then disappears. 

The problem is that your car’s BSD doesn’t function while the warning is on. And when it goes away, the system works seamlessly. So, if that’s what you’re experiencing, read our guide to know what causes it and the solution. 

What is BSD and How Does it Function?

BSD (Blind Spot Detection) is a sophisticated safety feature on your Hyundai. It detects and warns you when a vehicle or an object gets into your blind spot alongside or behind you. The system includes two radar sensors on the rear bumpers that search for vehicles or objects entering your blind spots. 

These sensors can detect objects as far as 70 meters from the rear and up to 4 meters from each side. You have to drive the vehicle for the Blind Spot Detection to activate. When it does, you’ll see a first-stage warning light on the side mirror when it detects an object within your boundary.

After that, a second-stage alarm sounds if you turn the indicator on to switch lanes. The BSD is an extra safety layer. It complements safe driving practices and boosts your well-being and other road users. 

What Triggers the Hyundai “Check BSD System” Message? 

The triggers of the Hyundai “Check BSD System” message are several. One of the most common is dirt on the rear bumpers where the manufacturer puts the sensors. Other causes include faulty hardware, code, and software update issues and a short circuit in the wiring.   

Let’s explain this to you:

Dirty Rear Bumpers 

Dirty rear bumpers are the most common trigger of the “Check BSD System” message on your Hyundai. That often happens when you drive in wet weather. Dirt, grime, and debris on the bumpers block the sensor’s path with the BSD signal receiver. The BSD system relies on the information that the sensors send. Thus, the warning light comes on once there’s no communication within the system. 

How to Fix: You must thoroughly clean your vehicle, particularly the bumpers. After that, check whether the light has gone off. If not, turn the BSD system off and on again. You might need to repeat it several times until Hyundai’s service automatically fixes it.   

There’s a Short Somewhere

As mentioned, the BSD system uses two sensors, which are on the rear bumpers. Therefore, there must be wiring connecting the system on the dashboard with the sensors behind it. These cables can short-circuit or break, cutting off the connection. 

If that happens, the BSD system cannot communicate with the sensors. Hence, your car’s ECU will notify you through a warning with the “Check BSD System” message. 

How to Fix: Test the wiring and cable the BSD system plugs into. Repair any broken or loose wires. You can also add dielectric grease to insulate the connectors and cable. The grease will also protect them against breakage and potential shorting due to high voltage. 

Faulty BSD System

So, the bumpers are clean, and you’ve established that the sensors are functioning as they should. Also, you’ve noticed no signs of short-circuiting in the wiring. In that case, then the BSD system itself could be defective.

One common symptom of a faulty BSD system is inconsistent or intermittent operation. One moment the system is working, and another, the warning light turns on.

Or you see a different message when it turns on, such as “blind spot monitoring disabled, radar blocked.” You may also notice that the system resets itself each time you stop and restart the vehicle. 

How to Fix: You’ll require unique information and tools to troubleshoot this issue. It’s best to look at it professionally, especially if your Hyundai’s warranty is still active. Most likely, the expert will recommend replacing the right-side BSD system, which can take about 2 hours. 

A Code Problem

Sometimes, all that your Hyundai BSD system is suffering from is a software issue. For example, the ECU might have an error code for battery over voltage. This code needs to clear before the system can continue to work correctly. 

Other times, you may reset the unit, but after a couple of days, the problem returns. In that case, the system malfunction could result from software failure, and after an update, it will regain its normal health. Moreover, the sensors may require reprogramming to read correctly. 

How to Fix: Take your car to the dealership and, as mentioned, have them clear the troublesome code. After resetting, they may also reload the software and test the vehicle before giving it back to you. The experts will know if the sensors have failed and require calibration to improve their functionality. They might even replace the sensors for you if they are the problem.


How Much Will It Cost to Repair BSD System? 

Professional BSD System repair can cost anywhere from $800 to $2,100. The price varies depending on the type and extent of repairs and the location. Your dealership can do the repairs for free if your vehicle is still under warranty. 

Can I Fix the BSD System Myself? 

You can fix the BSD system, depending on the cause of the malfunction. If dirt and debris have blocked the rear bumper sensors, you only need to clean the car thoroughly. However, some fixes are complicated and require the expertise of an experienced mechanic.  


The Hyundai “Check BSD System” message is a unique problem. That’s because your owner’s manual doesn’t discuss it in detail. As you might have already discovered, the manufacturer only says, “take it to your dealer if you get this error.”

A trip to the dealership isn’t something you want to do often. Thus, it’s better if there’s anything you can check to try and sort the problem yourself. Hopefully, this guide has helped you figure it out; good luck!

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