Park assist

[Ljm2421]

I have a 2020 Silverado. I towed my boat with it for the first time last week. The trailer is disconnected but my park assist hasn’t worked since the trailer was disconnected. The light on the dash lights up and turns off instantly. 
Any help is appreciated,

Lee

[Gray Fox]

Is your hitch still in the receiver? I know on both my 09 and 12 it would see it and think there was something behind me. My 20 doesn’t but it may be in respect to the location of the sensors and the size of the hitch. 

[EddDe]

This may not apply to you, but manual says REAR park assistance will not work properly if the tailgate is down.

[Anacortes Army Guy]

On 11/3/2021 at 3:54 PM, Ljm2421 said:

I have a 2020 Silverado. I towed my boat with it for the first time last week. The trailer is disconnected but my park assist hasn’t worked since the trailer was disconnected. The light on the dash lights up and turns off instantly. 
Any help is appreciated,

Lee

As mentioned by a previous poster, if you still have the ball hitch stinger in the receiver, that could be what the sensors are sensing.  However, if you've removed it, and regardless of what may or may not light up on the dash, does the rear park assist actually not work when you're backing up to an object?