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BMW Parking Assist Malfunction, Auto PDC failure, and no parking assistance may display on the iDrive screen due to a faulty sensor, defective control module, or software issues with the Park Assist module. 

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BMW PDC Light Warning SymbolBMW parking assistant uses ultrasonic sensors to measure parking spaces on both sides of the vehicle and incorporates the Park Distance Control system.

Anytime the car speed is lower than 22 mph, it observes the potential parking spaces. It also takes over the steering, braking, and acceleration during parking.

What Causes BMW Parking Assist Error Message?

BMW parking assist module

"BMW No Parking Assistance, please park unaided" may come on due to one of the following reasons. 

Defective Sensor

As with the already mentioned dirt and dust obstructions, improper sensor operation can result from mechanical damage. Although a slight impact to the bumper might not leave a visible trace, it could push the sensor out of its place.

The result will be incorrect readings and possible system failure. Naturally, it is also possible for a sensor to fail, as well.

Excessive amounts of dirt and dust can distort the signal from ultrasonic sensors and disable the system. On some occasions, this will also happen after washing the car as dirt particles gather up at the sensor's edge.

Usually, cleaning the sensor with a clean cloth solves the problem.

Software Issues

In some cases, a software issue can cause problems with parking assist. As a result, the system will malfunction only in specific situations, such as parking in a tight space.

This can be solved with software updates as BMW continuously develops software solutions.

Control Module

On almost all BMW cars, the control module is installed in the trunk next to the battery. If, for any reason, water floods the boot, it will also fill in this compartment. As a result, corrosion and other buildups can occur within the control module.

One solution is to open the module and clean all traces of corrosion.

Active Power Steering

Mechanically, the park assist system relies on an Active power steering system to operate the steering wheel. Unlike traditional hydraulic systems, this one uses a powerful electric servo motor to aid the driver.

Any issues with it will result in an inoperable park assist system.

How to Diagnose and Reset BMW PDC Parking Warning

To diagnose the BMW parking assistance system, you will need a BMW All System scanner. 

  1. Locate the OBD-II port under the dashboard on the driver's side. port to diagnose BMW park assist
  2. Plugin your scanner and turn on the ignition. BMW scanner
  3. Allow the scanner to turn on and select your BMW model. 
  4. Select Control Units from the main menu. 
  5. Scroll to Park Assist (PDC) and select read codes. 

Write down the fault codes. Further troubleshooting may be required to find the defective part or sensor. 

How Does BMW Parking Assistance Work

This system is fairly easy to use for a driver. He initializes the parking procedure by pressing the parking assistant button located in the center console.

The parking assistant will scan for a free parking space with slow, straightforward driving.

On the controlled display, it displays parking spaces that are suitable. To select the discovered space, the driver must use a turn signal in that direction. After stopping and putting the transmission in reverse, the automatic steering process will take effect.

While the Park assist system controls the steering, the driver controls the braking and gear selection. The driver can cancel the whole process at any time by pressing the button once more.

The system depends on the sensors and other components to work with no glitches; even the slightest irregularities can malfunction. If this happens, the system will warn the driver with a Parking assist malfunction warning message such as: 

  • Parking assistant malfunction, Parking operation has been canceled. Please park the vehicle manually. 
  • Parking assistance. No Parking assistance; please park unaided. Consult service center. 
  • AutoPDC malfunction.