Compass, Roadsigns & Navi Issues

gjrobinson68 · November 29, 2023

Hello,

I have a 2021 Sierra Denali that intermittently has issues with the compass, road signs, Navi and GMC App not working. It went completely out about 12 months into ownership with the GPS red crossed out circle, after multiple trips to the dealership they fixed it replacing the GPS module. It worked okay for about 8 months and now it intermittently stops working, I get the CAL for the compass, road signs are blank, Nav freezes on the last location, no App connection. Onstar can not connect to the vehicle and has asked me to take it to the dealership.

I am tired of the dealership hassle, thinking it might be the shark fin antenna. Anyone have similar issues and what it took to fix it?

Thanks...

eppieguy · November 30, 2023

I'm not 100% sure but I thought you need to have an active Onstar account for all of those functions to work, maybe that's the issue?

64BAwagon · November 30, 2023

The shark fin antennas have had corrosion issues due to poor seals.

gjrobinson68 · November 30, 2023

Thanks 64BAwagon, my research has shown this to be a common issue on the '14 to '18 models. Curious to hear if anyone has experienced the same issue on the '19 and up trucks? It is acting like what I think would happened if the antenna connection had corrosion issues and worked some of the time.

Tom73 · December 4, 2023

I had a similar issue and it was a bad SD card.

macattack64 · December 5, 2023

Well they are still having all the same issues in my 2024. I have even had the motor die 4 times and yes the auto off was turned off. Also have a relay clicking sound between the defrost ports and infotainment head unit. Been dealing with these issues starting with 3 miles on the truck.

GMCustomerService · December 6, 2023

On 11/29/2023 at 1:37 PM, gjrobinson68 said:

Hello,

I have a 2021 Sierra Denali that intermittently has issues with the compass, road signs, Navi and GMC App not working. It went completely out about 12 months into ownership with the GPS red crossed out circle, after multiple trips to the dealership they fixed it replacing the GPS module. It worked okay for about 8 months and now it intermittently stops working, I get the CAL for the compass, road signs are blank, Nav freezes on the last location, no App connection. Onstar can not connect to the vehicle and has asked me to take it to the dealership.

I am tired of the dealership hassle, thinking it might be the shark fin antenna. Anyone have similar issues and what it took to fix it?

Thanks...

This is certainly not what we like to hear, gjrobinson68. Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2021 GMC Sierra's navigation system. To do so, please send an email to [email protected] with ATTN: gjrobinson68/GM Trucks in the subject line.

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