A quick video to show you how to check the park assist sensors on a GM Silverado / Sierra to see if the sensors are working or if they are bad. I use a sound meter or db meter on my phone to check and see if they are emitting the ultrasonic sound they should be.
Autel MS906TS
https://amzn.to/3a26b2j
XTOOL D8W Wireless Bidirectional Scan Tool
https://amzn.to/3VG6QN7
795159-Silver Painted Parking Aid Assist Backup Reverse PDC Sensor
https://amzn.to/3zkyTdx