3500 gmc not warning me

[Mike Weinandy]

My 3500 is warning me when I'm getting too close with the frontof truck to something.  Nothing with the rear though.  I have a hitch in but that shouldn't stop the warning bells.  I've gone into settings and checked both bells and seat warnings and still nothing.  Does the hitch really stop this from going off?

Edited April 11, 2024 by Mike Weinandy

[bruceb58]

It doesn't do it in when you put it in reverse? I have a ford that does with my WDH on but don't have my GMC yet to know.

[Mike Weinandy]

When in reverse,  I have backing cameras and I get within a couple inches of anything and no warning at all.  Going forward,  the seats vibrate even though I have it set for sound warning

[Another JR]

I can’t find anything in the manual about it, but my truck sometimes will have the rear park assist disabled on startup and will display a message for a few seconds after start. It only happens when I park in my barn center aisle backed up within a foot of my other truck. The manual does say park assist won’t work when the tailgate is down, and i think it’s for the same reason. I believe that if the sensors sense an object in close proximity at startup, the rear park assist system is disabled. My guess is your hitch is having that effect. Do you see a message briefly after starting the engine when this happens? 

[bruceb58]

What happens when you take the hitch out and back up?

[BuckWallace]

Mine disables the sensors if I have my WDH in.

[sstoner911]

Front and Rear Park Assist can be turned
Off, On, or On with Towbar. To view
available settings from the infotainment
screen, touch Settings > Vehicle > Comfort
and Convenience. If Park Assist is turned off
through vehicle personalization, the Park
Assist button will be disabled. To turn Park Assist

on again, select On in vehicle
personalization. The On with Towbar setting
allows Park Assist to work properly with a
trailer hitch. Some larger trailer hitches may
not be compatible.
Turn off Park Assist when towing a trailer.
To turn the RPA symbols on or off, from the
infotainment screen, touch Settings >
Vehicle > Comfort and Convenience > Rear
Park Assist Symbols.

[Pryme]

I back my truck into the garage every day. I’d be so annoyed with a beep. I simply look at the rear backup camera along with the mirrors and to see the exact spot I want to stop. It’s always within a inch

[Mike Weinandy]

10 hours ago, sstoner911 said:

Front and Rear Park Assist can be turned
Off, On, or On with Towbar. To view
available settings from the infotainment
screen, touch Settings > Vehicle > Comfort
and Convenience. If Park Assist is turned off
through vehicle personalization, the Park
Assist button will be disabled. To turn Park Assist

on again, select On in vehicle
personalization. The On with Towbar setting
allows Park Assist to work properly with a
trailer hitch. Some larger trailer hitches may
not be compatible.
Turn off Park Assist when towing a trailer.
To turn the RPA symbols on or off, from the
infotainment screen, touch Settings >
Vehicle > Comfort and Convenience > Rear
Park Assist Symbols.

I'll try this tomorrow. Don't want to take hitch out as I use it frequently and it weighs 48lbs. 

[Mike Weinandy]

Figured it out.  Settings- vehicle- collision/ detection- then park Assist Towbar.  Set it for either attached or not attached