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.  

We are sorry to see you are facing this concern with your Sierra and would like to take the time to learn more. To do so, please send us an email to [email protected]. Make sure to include your Username and Forum name in the subject line with additional details. We look forward to hearing from you. 

[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.

 

[Roger F]

My 2025 GMC 1500 Denali has been having issues with the park assist.  I have had it at the dealer twice.  The second time they replaced a module and it worked for one day....now I am back at square one.  I called the dealer and they said they would back to me, but this is day two and no response so far....FRUSTRATING. What are my options??????

[newdude]

11 minutes ago, Refclown said:

My 2025 GMC 1500 Denali has been having issues with the park assist.  I have had it at the dealer twice.  The second time they replaced a module and it worked for one day....now I am back at square one.  I called the dealer and they said they would back to me, but this is day two and no response so far....FRUSTRATING. What are my options??????

 

 

Keep taking it back, but make sure you take it while its acting up.  

[Roger F]

I will do that ....but I have to drive 40 miles each way to the Dealer....  What steps can I take to have GM get involved....before I file under the Lemon Law?

[GMCustomerService]

On 5/22/2025 at 10:27 AM, Roger F said:

I will do that ....but I have to drive 40 miles each way to the Dealer....  What steps can I take to have GM get involved....before I file under the Lemon Law?

Our team is eager to get involved and assist throughout this process, Roger. So that we can, we ask that you reach out via email at [email protected], with "GM Trucks Forum" in the subject line, along with your VIN. We are keeping a very close eye out. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

[Coachvj]

My ‘25 Sierra Denali is having same issue with the parking guidelines only working intermittently. They replaced a sensor and after a week or two problem came back. So, off to the dealer I go again. I am not happy!