Help with a "NO GPS" in 2015 Tahoe Nav

[cbuckeye20]

I know its 2020 and everyone uses Carplay for nav, but we go hiking in mountains frequently where there is no cell reception so I regularly would use the built in nav.

There are a few threads on this already, everyone saying the sharkfin is the most common.

I followed this video

after buying this part from ebay https://www.ebay.com/itm/84081915-B...lade-Silverado-Siera-Tahoe-Yukon/254155958502

No signal. Drove around for 10 minutes looping the neighborhood, no signal. Disconnected battery for 5 min and repeated process, still no signal

The connections under roof are secure/don't pull free without a screwdriver and pushing the tab down.

I cleaned off all the crud under the sharkfin and its like 99% black paint with only a few marks I couldn't get off. I'm not sure if those silver tabs on the bottom do anything https://i.ebayimg.com/images/g/MnwAAOSwjFleREzI/s-l1600.jpg

I tightened the bolt down all the way.

Is there anything I can do at this point to know if the replacement antenna is junk or if I have to go further downstream?

 

[AZCreeker]

I know its 2020 and everyone uses Carplay for nav, but we go hiking in mountains frequently where there is no cell reception so I regularly would use the built in nav.

There are a few threads on this already, everyone saying the sharkfin is the most common.

I followed this video

after buying this part from ebay https://www.ebay.com/itm/84081915-B...lade-Silverado-Siera-Tahoe-Yukon/254155958502

No signal. Drove around for 10 minutes looping the neighborhood, no signal. Disconnected battery for 5 min and repeated process, still no signal

The connections under roof are secure/don't pull free without a screwdriver and pushing the tab down.

I cleaned off all the crud under the sharkfin and its like 99% black paint with only a few marks I couldn't get off. I'm not sure if those silver tabs on the bottom do anything https://i.ebayimg.com/images/g/MnwAAOSwjFleREzI/s-l1600.jpg

I tightened the bolt down all the way.

Is there anything I can do at this point to know if the replacement antenna is junk or if I have to go further downstream?

How about taking it to the dealership and ask for a quote as a way at least to further investigate?
mine is doing the same thing, and I agree with you, relying on phone for everything is not something i want to do. When my gps was working we def. enjoyed the oem integration and not being tied up to our phones.