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my GMC app not working after OnStar activated and says OnStar no active in my account??

New Contributor

just purchased a 11k mile 2023 GMC2500.  Activated OnStar via truck cabin button and shows active in the vehicle information center.  My GMC account shows no OnStar active and MyGMC mobile app keeps asking me to activate OnStar.  Is there a lag time between when you activate and when it shows in the app?  Prior owner had OnStar and i just wanted to transfer to me.  i  deleted and re installed the mobile app without success, just keeps asking me to activate.  Who can  help resolve this please?



We regret to hear you're having trouble with the myGMC app and your new vehicle. Our team is happy to look into this with you and get your app up and running. To get started, please send us an email with these details to and "ATTN: OnStar Community/streetrodder" in the subject line. We'll keep an eye out for your message. 

New Contributor

I am also having this issue. Has there been a resolution yet?

Hi there! These concerns are typically best resolved when our team is able to review your OnStar account details in depth. For further assistance with your connectivity concerns, please email us at with "ATTN: OnStar Community/Jmar" in the subject line. 

New Contributor

Hi. Love the truck but MYGMC is doing the same thing on my phone looking for a solution.

Don't, Mahotey, we'd be happy to help you too. If you haven't yet, please link your GMC account to your OnStar account. This is a crucial step for integrating your Connected Services into your app. Be advised, if you are the Owner Proxy or Driver on the account, you must consult with the Owner to authorize this change. If you are the OnStar account Owner, please follow the steps below to link your accounts.

1. Log into your GMC Account via or
2. Once logged in, click on "Plans & Services” from the navigation bar
3. Enter either your OnStar account number or your username (email address associated to your OnStar account)
4. Choose your method of verification (email or text message)
5. Select "Send code"
6. Check either your email address or phone to locate the verification code
7. Once found, enter the verification code into the GMC Account Website
8. Click "Link account" to finish.

Once you have successfully linked your accounts, please log out and then back into your app with your GMC Account credentials. Should you find that these options are not visible to you on the GMC Account site, it's likely that you've already linked your accounts. If these steps do not resolve your concern, you can connect with us at Please be sure that you have your subject line as ‘ATTN: OnStar Community/Mahotey’ so we can reference back to this post.