Onstar will not conect

It is probably a bad connection on the OnStar antenna. It is that Shark Fin on the roof.

https://www.google.com/search?q=2020+buick+envision+onstar+antenna

Page 133 of the Owner Manual

Multi-Band Antenna The roof antenna is for SiriusXM, OnStar, and GPS (Global Positioning System), depending on the equipped options. Keep clear of obstructions for clear reception. If the vehicle has a sunroof, and it is open, reception can also be affected.

https://my.gm.ca/buick/en/content/dam/gmownercenter/gmna/GMCC/dynamic/2021/buick/envision/en/2021-buick-envision-owners-manual-english.pdf

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OnStar is integrated into the entertainment center. If you are trying to disconnect it, you have to remove the internal connection from the entertainment center to the OnStar module.

push button or call onstar

Could be either one, but I would call Onstar tech support before doing anything. A dealer can probably figure out what's wrong in a hurry.

Onstar is not a phone. It is a service. It cost you money. Push the green button and you will get Onstar/operator. They will guide you threw it. No Onstar, the module is probably bad.

Could be that the potentiometer is not tracking properly. If that is not it, then it is the chip that controls the volume at fault.

I don't blame you for not wanting the dash pulled actually. Does the OnStar indicator light, next to or around the area of the blue button you would normally push to contact OnStar, show green and blink when you push the blue button or is it red and or blinking at all times.
There are several bulletins related to the problem but I need to know what the indicator is doing.
Make certain the dealer has performed Document ID: 3975755 before any major disassembly.

No, OnStar is a GM only product. OnStar is a factory-installed option and cannot be installed by a dealer or retailer, so you must do one of the following: 1) Purchase a GM vehicle with OnStar 2) Own a GM vehicle with OnStar. Acura contracted with GM for a few years, OnStar was in the RL. I never heard of this in any other Honda products. ...
CONTINUE READING No, OnStar is a GM only product.

OnStar is a factory-installed option and cannot be installed by a dealer or retailer, so you must do one of the following:

1) Purchase a GM vehicle with OnStar
2) Own a GM vehicle with OnStar No, OnStar is a GM only product. <br /><br /> OnStar is a factory-installed option and cannot be installed by a dealer or retailer, so you must do one of the following: <br /><br /> 1) Purchase a GM vehicle with OnStar <br /> 2) Own a GM vehicle with OnStar Minor edit? Save Cancel 4 people

The Vehicle interface unit VIU and the Vehicle control unit VCU and the receiver is located behind the glove box in the passenger footwell. the onstar button is located int he overhead console. the modules are vin specific so they cant be swapped out without GM. you can remove them I have a 02 and since its no longer supported by onstar i yanked out the VIU and VCU and the cell phone receiver. then took the GPS transponder off the front driver side of the windshield and the rear attenna off the back glass and got an overhead console minus onstar and put it up. They unplug and cause no problems The fuse is fuse 32. The actual guts of the Onstar system is in the frontmost overhead compartment that is between the driver and passenger seats. However, if the option wasn't purchased you'll just have an extra slot for sunglasses.

What do you want to disable the sound when you push the buttons or the service you get when you push it?

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589