Service park assist

[Savsnnah]

Hello!
I keep getting service park assist pop up. When I put my car in reverse my backup camera is showing red for all four of my back sensors. Any suggestions on what I should start with replacing?
2015 Tahoe LT

 

[swathdiver]

Don't throw parts at it. Get a scan tool that can read chassis and BCM codes. On the previous generation, the lines for the camera reside in the steering wheel angle sensor.

 

[Walkerfever]

I know it's a few months late, but I used a cell phone to trouble shoot my sensors. Have someone record a video with the cell phone while the Tahoe is in Reverse and you are holding the brake (Don't be stupid, chock the wheels for added safety if you want). In the video, you should hear a clicking come from each sensor. If you don't then that sensor is bad. I bought 4 sensors for $35 on Amazon and they've been working for 6 months without issue. These are what I bought. https://a.co/d/ig8g6aJ