aDave

Thanks for the information. I've not been able to address this further just yet, as I'm dealing with another problem (tail light installation) that has taken priority. I'll be looking to see if there is anything new about the radio update, but I'm gathering, based upon what I've read so far, that this might not work for me due to having the Bose system. Thanks again.

I know this is an old thread, but I didn't see any point in starting a new one. My '15 Sierra just started doing this, to where it's randomly loud and then normal. Did you ever do the amp fix that you posted about? If so, did it work for you? The post just below you mentioned "radio module," so I guess I'm kind of curious if one or the other (or both) can be the culprit. I am just starting my research on this, and I typically don't use our dealer in town. So I apologize for the additional questions. Oh, and that post you quoted...Is T and P a user there? Thanks.

Well, I know this is an older thread, but add me to the club. 2015 Sierra 1500 in Bronze Alloy Metallic. I just noticed peeling today near the window on the driver's side rear door. It's approximately 1/2" in diameter. Considering age and mileage of the pickup (125K), I don't expect any help from GMC as it relates to warranty. I see a class action suit has been filed about the issue in Florida, so I've inquired if the firms have any advice. If there is a newer, more detailed thread, I apologize, and I will look further. I just landed here with a Google search about the problem. If anyone has new pointers, it would be greatly appreciated.

Well, I don't know if it was luck or not, but I ended up not having to go this route. This morning, I pulled the fuse to inspect it, and it looked fine. Based upon your recommendation, I waited a few minutes before putting it back in the block. I then started the truck to check the system, and the rearview mirror had power,. When I saw that was seemingly back to normal, I made a call with bluetooth, and I was able to be heard through the microphone. So, whether or not the solution had something to do with pulling the fuse, or just sitting overnight before restarting again, it appears all is well. So, Tom, I appreciate the help. ETA: Now I know why the fuse panel covers were so hard to remove. Those posts can be a bear to get loose. ?

Great, thank you. Fuse #23 in my manual is labeled Air Bag/Info, so you've given me a good starting point. I know this is a stupid question, but do I simply pull at the bottom of the panel to open it? I was trying the drivers side and was unable to pull it open. Does it REALLY need a good tug? While still searching around, this guy seemed to have the same problem I am. His solution is at the end of his thread. Is his solution addressing things on the same line as you have? He disconnected his negative cable, and if I've read correctly, he held the disconnected negative cable to the positive side to discharge the system fully. Is that safe, or should I just disconnect both cables to try a reset? Thanks for your help.

Hi guys, Today, I was confronted with a problem that I first thought was bluetooth/phone related, but after spending more time at the truck (2015 Sierra 1500 Crew Cab) and here doing some searching, I'm inclined to believe my problem is (in part) tied to Onstar. Please bear with me. The first item I noticed was that when making or receiving calls via bluetooth, I could hear the caller through the audio system, but they could not hear me. I went through unpairing and pairing multiple phones, and the problem persisted which pointed to the problem being the truck and not the phones. While working in the cab, I noticed that the green LED in the rearview mirror was not lit. I tried the Onstar push button, and I had no luck in reaching a representative. Further, the Onstar icon on the display home screen is greyed out while all other icons are well lit. Lastly, my phone no longer sees a Wi-Fi signal from the truck, and the "GPS" on the Nav display has a red line going through it. Despite the red line, Nav still tracks the vehicle on the road, but the movement of the truck on the display is more jerky than normal. The one thing that is still okay is reception for Sirius XM. The first thing I'd like to check is the fuse for this system, but I'm having a hard time finding one. Does anyone know which fuse may power this stuff? The manual mentions a fuse for the rearview mirror/universal garage door opener, but I'm not having a Homelink issue. Would this be the right fuse (#3 on the driver's side panel), or should I be looking somewhere else? As far as the phone mic issue, is that microphone powered or tied into Onstar, or are they separate? If this ends up being a fuse issue, then great. But, I've seen posts related to the sharkfin leaking and I'm wondering if this could have been the cause of what I'm dealing with. Coincidentally, it rained last night, but I'm not seeing any sign of wetness in the headliner. However, I've seen posts where there might not be any sign of a leak until the headliner was pulled and the antenna was examined. Anyone have a link for a good tutorial/video on how to pull the headliner? I have not really worked on my truck that much, so I could use a good step-by-step in order to guide me through if it comes to that. While I'm somewhat keying in on the power (fuse) and the antenna leaking as being concerns, is there anything else I'm missing? Is there a Onstar module somewhere that should be examined? Sorry for such a long post, but I wanted to try to cover a problem that could be multi-faceted. Thanks in advance for any advice or information you can offer. Best regards. Dave