What Does Park Assist Blocked Mean?

The Park Assist function is an aiding system in most modern cars which helps drivers while parking in narrow spaces. If this system is not functioning correctly for some reason, then you will receive a message or warning telling you that park assist is blocked. If you see the message “Park Assist Blocked See Owners Manual,” visit a professional mechanic.

However, there are some easy fixes that you can try before visiting the mechanic that can help with this issue.

Park Assist Warning Message

Where is it Located?

The message of park assist blocked usually appears on the information cluster of the vehicle, which is more commonly referred to as dashboard.

If you want to ignore the message, you can press the select button on the screen, and it will go away.

How Do You Reset Park Assist?

If you receive the park assist blocked message in your car, then before going to the mechanic, there are a few things you can try yourself to reset the system.

Please try the following:

  1. Cleaning the parking sensors in the rear bumpers carefully.
  2. Turn the park assist button on and off this might reset the system.
  3. Turning the ignition on and off might help in some situations.
  4. You could try pressing the rear park aid disable button, then enable it afterward.
  5. You can ignore the message by pressing the odometer stem and it might not come back.

If the warning message appears, visit a professional mechanic even after that. They will check your car with a scanner and fix the issue. A faulty sensor of LED would be replaced in case the warning still comes on.

Is Park Assist the Same as Parking Sensors?

Park assist and parking sensors are not the same thing. Park assist is a safety feature, and parking sensors are an object that aid in this action. Park assist is an advanced function that handles the steering when you are parking the car, while you just have to control the gas pedal and braking of the car.

Parking sensors identify an obstacle that comes within the hitting range. This data is then transferred to the car’s ECU that is in constant communication with the parking assist system.

The system will allow you to free your arms and sit back while seeing your car getting perfectly parked in a spot.

However, in some cars, the parking assist system might be referred to as the self-parking system. The parking assist could simply mean parking sensor project dynamic guidelines on the car’s infotainment screen.

The system also produces a beep sound when the vehicle is approaching an obstacle. The warning beep gets more intense as the distance closes.

Related: Should Radiator Fan Turn On When AC is On?

What Causes Parking Sensors to Stop Working?

Several reasons can cause parking sensors to stop working. Some of the major reasons are:

  1. Washing the Car: Washing the car can trap moisture inside the parking sensors. This moisture will bar it from functioning properly.
  2. Off-Road Driving: Off-road driving can cover the parking sensors with mud and dust. This will obstruct the view of parking sensors.
  3. Extreme Weather: Extreme weather conditions can cause parking sensors to stop working. Most of the times it has been reported that after a snowfall or heavy rain the parking sensors stopped working. Once the snow or ice was removed they were working just fine.
  4. Damaged Bumper: Parking sensors are present inside the rear and front bumpers of the car. In case your car gets hit from behind or you accidentally hit something in front then chances are that parking sensors will be damaged and stop working.
  5. High Speeds: Although the speed of a car is extremely slow while backing up. But if you are in an open area and reversing the car at higher speeds then it might cause your parking sensors to stop working. Most parking sensors stop working once the speed of the car exceeds 8 kmph or 5 mph.

How Can You Tell if a Parking Sensor is Bad?

Following are the most common symptoms you will face if the parking sensors go bad:

  • You would hear constant warning sounds from the parking system even if there is no obstacle nearby.
  • The dynamic guidelines created by the parking sensor would not appear on the rear-view camera screen or they might guide in the wrong direction.
  • The parking assist function that makes use of parking sensors will not work properly and self-parking will fail.
  • You can also tell by visual inspection of the car if a parking sensor is bad.

Related: What is the Meaning of SR5 on a Toyota?

How Much is it to Fix a Parking Sensor in a Car?

Like other sensors, the parking sensors are costly to replace or fix. Depending on the model and make of your car, the complete replacement of parking sensors can cost you somewhere between $500 and $1,300.

Other sensors like oxygen, MAF, and MAP would cost you below $300. But the reason behind the expensive replacement of parking sensors is that there isn’t one parking sensor in the bumper.

There are multiple sensors in it. So, you have to replace all sensors if the bumpers are damaged.

The thing with a sensor is that it can’t be repaired in most conditions. Unlike a hardware component that can be bent, straightened, or hammered to return to its original conditions, sensors are sophisticated devices that need replacement once it breaks or starts malfunctioning.

What Else Can Cause Park Assist Blocked Warning?

Parking assist blocked warning mostly appears due to bad parking sensors or other reasons that have been discussed in the above section.

Other than that, the following problems have been reported as a root cause for park assist blocked warning:

  1. Tow Trailers & Trailer Hitches

The most common reason reported on automotive platforms after bad parking sensors is the issue of tow trucks. While towing a trailer, you would commonly receive the warning that parking assist is disabled.

Some drivers reported that they received the warning even after removing trailers. The reason being they left the trailer hitch intact.

2. ECU Runs into Problems

When everything is fine, but you still get a warning about that system, there is only one possible culprit: the car’s ECU.

It is the car’s brain that handles the receiving, processing, and transmission of data. If there is a glitch or it runs into problems, you will receive unnecessary warnings like these.

What car models have this common issue?

As seen on multiple Chevy forums, the Chevy Traverse and Chevy Silverado are two popular cars where owners are faced with this warning. When writing this article, there are no recalls from Chevy addressing the issue.

According to various discussion boards, a “Park Assist Off” warning message is pretty popular amongst the GMC Acadia owners.

After checking the list of GMC Acadia TSB (Technical Service Bulletins), it seems that GMC have not addressed the issue officially.

Other car models that have this common issue include Buick Enclave, Chevy Avalanche, Cadillac CTS, Cadillac Escalade, and GMC Sierra.


When the System Does Not Seem to Work Properly

Advanced Active-Safety Systems Could Cost You Big in Repairs, AAA Reports