OnStar Module Broke

I am having the exact same issue.  I have a 2022 Yukon XL with about 40,000 miles.  I brought it in for oil change and "updates," and on my way home from the dealership check engine light came on, and no Onstar services work.  They are now telling me that the Onstar telemetry module needs to be replaced, at my cost.  This is obviously unacceptable in an $80,000 vehicle.

There appears to be a widespread issue with the telematics module. I own a 2022 Cadillac Escalade, and my telematics module is not functioning. When I took it to Covert Cadillac in Austin, TX, the dealership informed me that I would need to pay approximately $460 just to have the module scanned to determine why it is offline—before they could even diagnose the problem or suggest next steps. Additionally, I was told that my extended warranty would not cover the module.

I agree with other customers that this issue needs to be reported to the Better Business Bureau, and legal action should be considered. It is unacceptable for GM to ignore this recurring problem, especially since Cadillac issued a recall for the same issue back in 2021. Clearly, the problem was never fully resolved.

Reference: GM Authority Article

I will not for the life of me understand HOW 98% of complaints are about the exact same thing and no one is doing anything about it. 
I have a 2023 Yukon XL, and it just suddenly started out of nowhere, the internet stops working, the engine light comes on , take it to the dealership and they said $ ohh it’s your OnStar computer it needs to be replaced. $buy the computer and labor $600. First of all why is the computer broke? This is a 2 year old vehicle! What is wrong with these companies? This is absolutely unacceptable. This is a lawsuit 

We appreciate you bringing these concerns with your Yukon's OnStar module to our attention. This is not reminiscent of the OnStar and GMC experience which we hope to provide for our loyal members. Our team would like the opportunity to look into this further with you and your servicing dealership. When you have a moment, please send us an email with these details to socialmedia@gm.com with, "ATTN:OS Community/Jmarinelli00," in the subject line to proceed with this assistance. We hope to hear from you soon. 

My ONSTAR module needs replacing on my 2012 Chevy Equinox with about 146,000kms. So after 13 years I guess things wear out. However, I still have an active plan. So, back in June of 2024 I was told by an ONSTAR technician I probably needed a new module when they couldn’t tweak things from their end. After taking my vehicle to my regular dealership I was told that the module was discontinued. In their effort to help they contacted ONSTAR and their technician told them to try a hard reboot. It worked for about a month. More recently, because my plan is still active, I contacted ONSTAR again about my module being discontinued and they suggested trying another GM dealership as they thought it was odd the module was discontinued. After contacting a different GM dealership they too said the module was discontinued based on my VIN. So, I took it upon myself to contact the manufacturer of these modules and was told that the part number had changed and that they did have a module with a different part number that would work in my vehicle. The only drawback was the module had to be ordered and installed through a GM dealership. I was quoted a price of $575 plus another $200 (+ taxes) to install it. Like others this seems expensive and ONSTAR doesn’t seem able to do much when it comes to pricing.