Volvo XC40 2020 Owner's Manual page 367

IMPORTANT
In certain conditions the parking assistance
system may produce incorrect warning
signals that are caused by external sound
sources with the same ultrasonic frequen-
cies that the system works with.
Examples of such sources include horns,
wet tyres on asphalt, pneumatic brakes,
exhaust noises from motorcycles, etc.
NOTE
Since a towbar is configured with the car's
electrical system, towbar protrusion is
included when the function measures the
distance to an object behind the car.
Related information
Park Assist* (p. 361)
•
DRIVER SUPPORT
365
* Option/accessory.