GPS Quit Working

[Ron.s]

After about a year the GPS on my 2016 quit working. A few days before I was waxing the top and the metal is so thin that it flexed around the GPS antenna and water ran out from under seal. It hasn't leaked yet but I suppose that's next. Dealer visit next week.

[JimCost2014]

After about a year the GPS on my 2016 quit working. A few days before I was waxing the top and the metal is so thin that it flexed around the GPS antenna and water ran out from under seal. It hasn't leaked yet but I suppose that's next. Dealer visit next week.

do you have an update from the dealer visit?

[Ron.s]

do you have an update from the dealer visit?

Had to cancel appointment, maybe this week.

[Ron.s]

OK, dealer visit 3/9/17 update. The dealer tech found "open in roof mounted hi frequency antenna" after "computer systems test". Ordered new antenna.

While waxing my truck I noted water coming from under the roof seal. It fits tight but the flimsy top lets the metal flex with moderate pressure. The day after the visit my GPS started working again. I think I got the water out by pressing on the top until it quit weeping. I assume this was creating a short while wet.

Funny-I threw this theory at the Service Writer but they ignored this and likely have ordered an unneeded part. I didn't contact them again because this will at least get them to look under the seal. I'll discuss this again when I go back next week for replacement. Now if they plan to remove the headliner I'll reconsider.....

[tbarn]

There are 2 seals on these antennas . The outer one with a vent on the upper side (should on the lower side for drainage) that doesn't seal out much. Then there is an inner seal that should seal the hole in the roof. We have replace a bunch of these for leaking but not so much for loss of gps. Talk to the tech or SM to see if they will add a little silicone sealer to help seal it. Water that gets beyond the outer seal shouldn't be a huge problem if the inner seal is good. See more gps issues with the Tahoe/Suburban antennas. There is also a spliter under the defrost grill that has been known to fail on a few. Only if you have on board nav (I06). Splits the gps signal for the gps/nav and onstar. The head liner will have to be lowered along the windshield and left 'A' pillar area but not "removed"

Edited March 12, 2017 by tbarn

[Ron.s]

Thanks tbarn, an informed and helpful reply. When I got my paperwork and read the Service Writers notes it was nothing like what I reported.

[GMCustomerService]

Hello Ron.S,

 

We’re sorry to hear your Sierra’s GPS is misbehaving. You’re welcome to send us a private message, if you’d like us to reach out to your dealer on your behalf.

 

Kindest regards,

 

Anthony

GM Customer Care

[Rschroer]

I'm having this same issue 2016 Suburban...can't send a message to GM service...go figure

[Z45]

Water intrusion is a known problem. Mine had to replaced this year.

 

 

Condition/Concern

A customer may comment they have one of more of the following symptoms:

• Visible Water leak or signs of water intrusion from the antenna base
• RED OnStar LED
• Unable to connect to OnStar
• OnStar unable to locate the vehicle
• OnStar has inaccurate GPS location
• No GPS on the Navigation Radio Display
• Inaccurate GPS location on the Navigation Radio Display
• XM Radio No Signal or poor reception

The issue will usually be accompanied by a DTC (B2462-02, B2462-04, B2470-02, B2470-04, B125C-01, B125C-02, or B125C-04 ).

Note: This recommendation only applies to vehicles equipped with the high frequency “painted” antenna assembly after built before the dates listed.

Engineering has identified an issue of water intrusion into the body of the antenna assembly which can ultimately travel down the wiring pigtail into the vehicle.

There have also been cases of water leaks from underneath the antenna at the roof panel opening. Inspect the roof sheet metal to ensure there is no deformation at or near the antenna pass-thru opening

If the antenna performance concerns outlined and/or one of the water leak concerns are encountered, replace the antenna ensuring to use the latest antenna part number available from CCA parts without removing the cover from the base.

Important: The painted antenna cover is NOT intended to be removed. Do Not remove the antenna cover from the antenna base, as this may compromise the sealing performance of the new part.

Note: DO NOT use and any form of Sealants on the replacement antennacover, seals or gaskets.

Edited October 9, 2017 by elcamino

[USCGRetiredJosh]

I had the same problem of no GPS. I took the god antenna out and opened it up and found some moisture on the inside. I dried it out and put it back together and that still didnt fix it. I noticed the green light was out at the Onstar buttons, also. So I unplugged the connector for the rear view mirror and plugged it back in. That fixed my no GPS issue and my Onstar green light came back on.

[BULLITT65]

Ok, I have a 2016 Yukon XL  Denali, and after having the signal disappear a couple times in 2017, now I have the red light on my ONSTAR mirror and my GPS says I am 50 miles away and can not locate me. I called GM and asked about the recall 15155 and they said my vin number was not part of that recall. The only thing I could do is have my case escalated for the time being and I now have a 48hr wait to see if a supervisor can investigate the matter. I told the representative that I was experiencing similar issues as mentioned in the service bulletin, except I haven't seen any water inside the car. She said then it is not the same issue then.

So after I got off the phone I went outside and inspected the antenna. I thought well maybe it doesn't have a tight seal to the roof? As soon as I started inspecting the rubber seal and nudged it with my fingers a decent amount of water came out. There is a weep hole in the rubber but it is on the back (high side). The water appeared to be pooling in the front. (the lowest point).

We have a 2000 Tahoe with approx 250K miles on it, and the thing runs like a champ. The LS motor is what sold me.  I purposely purchased this car a year after it was released so they would have worked out all the bugs. Between the the roof bow/noise issue, and some other things, I think they figured it out by the time we purchased ours. I have been really happy with this vehicle so far. The 6.2L LS and 8 speed transmission, with the MRC has been as good as expected. Even getting on average about 17-18 MPG around town, and 22 MPG on the freeway. I hope GM will take care of this issue with the antenna, so we can continue on with it for many years to come. 

 

[BULLITT65]

Josh how did you remove the antenna?

[tnt1291]

So I took my 2016 GMC Sierra Denali in since my GPS quit working suddenly the dealership just called and said I need to replace my antenna with a new improved antenna which in my eyes means that GM has issues with there OEM antenna. The new part is $150 and they say the labor is $400 that seems excessive to me seeing if anyone has had the same thing told to them.

[Tgoldsmith]

Yes same problem  2015 highcountry told me corrosion and needed new antenna 400 dollars. I had a headliner leak a year ago a few drips left corner. Never fixed it 

[Huazcar lozano]

Same issue. I own a 2016 Sierra Denali 6.2 and just bought it used from motor werks Cadillac in Barrington il. And they told me the same thing. $600 dollar repair. And said that the bumper to bumper warranty was expired, which it is. But come on with only 30k and I have a leak and the GPS is not working. I hope they fixed the problem and design better more thoughtful parts. it is an expensive truck. And to have this problems like this I think is unacceptable. thanks and GM DO SOMETHING ABOUT IT!

Edited August 29, 2019 by Huazcar lozano
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