2021 Sierra 1500 Park Assist Failure and Unresponsive Switch AGAIN

[tjonesdfw]

2021 Sierra 1500 Denali with 42K miles has been experiencing intermittent failure of the Park Assist system for the THIRD time since originally reported to dealership.  The gauge cluster will suddenly report "Park Assist Off", and then the switch becomes unresponsive, with no orange light, and no change in anything in the cluster no matter how many times the switch is toggled.  The issue often resolves itself after a few ignition cycles or after the truck sits overnight.  After multiple reports to dealership, at its final service before factory warranty expiration, the dealer finally claimed it was bad sensors in the front bumper and claims to have replaced them but the same issue is back again.  None of this is happening during rain or cold weather, and the truck is clean with no obstructions on the front bumper.  Has anyone else had this issue and had success getting it fixed permanently? Unfortunately this truck has had electrical gremlins starting under 100 miles to present; multiple CELs for misfire codes, camera failures, camera module failures, park assist failures, stereo failure, etc.  

[GMCustomerService]

On 7/12/2024 at 11:26 AM, tjonesdfw said:

2021 Sierra 1500 Denali with 42K miles has been experiencing intermittent failure of the Park Assist system for the THIRD time since originally reported to dealership.  The gauge cluster will suddenly report "Park Assist Off", and then the switch becomes unresponsive, with no orange light, and no change in anything in the cluster no matter how many times the switch is toggled.  The issue often resolves itself after a few ignition cycles or after the truck sits overnight.  After multiple reports to dealership, at its final service before factory warranty expiration, the dealer finally claimed it was bad sensors in the front bumper and claims to have replaced them but the same issue is back again.  None of this is happening during rain or cold weather, and the truck is clean with no obstructions on the front bumper.  Has anyone else had this issue and had success getting it fixed permanently? Unfortunately this truck has had electrical gremlins starting under 100 miles to present; multiple CELs for misfire codes, camera failures, camera module failures, park assist failures, stereo failure, etc.  

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[tjonesdfw]

Message sent GMCustomerService.  

[Michelle H]

Any resolve? Exact same issue I am having. 

 

[tjonesdfw]

On 11/13/2024 at 12:54 PM, Michelle H said:

Any resolve? Exact same issue I am having. 

 

They have replaced sensors in the front bumper twice, sensors in the rear bumper once, and various connections in the wiring harness in the rear.  Unfortunately after all repair attempts, the Park Assist still goes out from time to time.  Now I'm also getting messages that the rear cross traffic alert system is disabled.  I'm about convinced these are just poorly designed systems, with no real fix.

[Glava2876]

I see these type of posts and they are what I started getting in my 2020 1500. There were increasing intermittent problems with park assist, adaptive cruise, and eventually even the power steering. Check the braided grounding strap on the lower passenger side firewall to the frame.

it is braided with no covering and they literally start decomposing with time.

when I twisted mine it literally started falling apart.

when I replaced mine all these odd gremlins went away and have stayed away.