Forum Discussion
Telematics Module Failure
My 2023 Yukon Denali just joined the club of failed telematics modules. After doing the call in...unable to resolve...take to dealer dance, I was able to get an appointment and they confirmed it needs to be replaced. Obviously frustrating because it seems like one of those things that really shouldnt happen. We do a number of very long road trips from Texas to New England each year and I bought the car specifically because I wanted the duramax diesel engine, the rear entertainment system for my 7 and 4 yearolds (and my sanity), and the super cruise. That combo is very hard to find and even longer to order from GMC. When I was looking, I only found 4 on the used market and was quoted a one year lead time for ordering from GMC....I ended up buying mine from Carmax in California and had it shipped to Texas. I have absolutely loved the car because of those and was happy to continue paying for the service once the free trial ran out. Coincidentally one week before it was running out, and after I had already signed up, the system failed. We leave for our trip in 2 weeks and I'm going to be very disappointed if it doesnt function.
So I speak with the service rep at my dealership...she tells me about the backorders etc...which I already knew about from these posts but I told her I still want to go forward with replacing it so please order it. She gives me a quote for $1,150 all in (parts and labor) which seems absurd given that it failed through no fault of my own or any type of misuse. it's a 3 year old car...come on... But I told her I need it fixed and to order it. She's gone for a while and comes back and told me that I was very lucky and they were able to source one from the manufacturer...it'll be here in 3 days. Fantastic I guess.
I say all of that to ask...it seems like some have had varying success in having the replacement covered. If you have been successful...how did you do it? Given that I was able to get one immediately I didnt want to argue and miss out on it but I also dont really want to drop $1,150 on it either.
7 Replies
I just purchased a 2025 Sierra EV Denali and have same Onstar problem. Button has solid green light indicating cell connection but nothing works. Can connect my phone to onboard hotspot but no internet, no navigation, no super cruise etc... Very disappointing and should have been caught by dealer before selling the truck. Basic stuff.
First, we want to congratulate you on your new Sierra EV, @mmcfadin. We understand your frustration with your OnStar concerns and share the same desire for you to enjoy all the features available in your new truck. If you have not yet, we highly encourage you to visit your local GMC dealer for a formal diagnosis of your concerns. That said, we would be more than happy to provide an extra layer of support between you and your dealer as we pursue their resolutions. When you have a moment, we would like to learn more so we may explore next best steps. To connect with us further, you may select the envelope icon at the top right of your screen. Then, send a private message to OnStar_Support with your full name, VIN, current mileage, and the name of your preferred GMC dealer. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.
We recognize how the current circumstances with your Yukon are not at all ideal, especially with these unexpected out-of-pocket costs and your upcoming family trip in a few weeks. Our team would like to look into this further to see what we can further clarify regarding the repair timeline and assistance options alongside your dealership. To connect with us, please send a message to OnStar_Support with your full name, VIN, mileage, and the name of your involved GMC dealer. Just select the envelope icon at the top right of your screen to begin. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.
I am having a similar issue. My car was purchased new in 2025, Equinox RS. I also purchased it because of the features, especially onstar. We also travel a lot and are traveling in a few weeks and need the onstar connectivity, maps, emergency services, etc. A month ago the wifi hot spot stopped working and features started failing. I talked to onstar and ended up at the dealer two days ago. They kept my car for two days only to tell me what I knew...new telematic control module needed to be replaced and it is on backorder, with no estimated time of replacement.
This is very frustrating. Its basically a year old car and the biggest selling point is not working with no fix in sight. Thankfully mine is under warrenty but in my opinion that puts me at the end of the line since it isn't a direct from customer payment to the dealer.
It does not escape us how important OnStar Services are to our dedicated Members while on the road, Jill. While your dealership is in the best position to address these module repairs and keep you updated throughout the process, our team is always here as an extra line of support. If it interests you to connect, please send a message to OnStar_Support with your full name, VIN, mileage, and the name of your involved dealer. Just select the envelope icon at the top right of your screen to begin. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.
I just purchased my fabulous 2024 Blazer RS EV 8 days ago , and my service emergency calling error came on 3 days after I brought it home. I called OnStar, who tried resetting remotely, but that didn’t work. I tried the other step of shutting it off, walking away, then trying again. Error was still there. So I contacted the dealership, who told me they wanted $200 just to diagnose it. And I’m seeing $1000 estimates. All while finding out this is a common problem, has been for at least a couple of years, and it’s not being recalled or fixed under warranty if your warranty is over. This is very very disappointing and I can’t believe OnStar nor GM is taking care of this situation without charging us. What ever happened to taking care of customers so they return to your product or service?
This experience with your Blazer RS EV doesn't sound like something we hope to hear, @Edddreeb. We would like to learn more about your situation and assist to the best of our abilities. Once connected, we can best explore opportunities for support alongside the trained technicians of your servicing dealership, while they gather a formal diagnosis and work to address the concerns with your OnStar Service Emergency Calling Error. To start, kindly send us a message at OnStar_Support with your full name, email, phone, VIN, mileage, and the name of your involved dealer. Any other details or context you can share on where things stand currently with your vehicle and your plan of action with the dealer is also appreciated, as this can aid in our investigation. Just select the envelope icon at the top right of your screen to do so. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.