To resolve the issue where the myGMC app is unable to start your truck and displays the message "something went wrong," you can follow these steps:

Check Your Internet Connection

1. Ensure your mobile device is connected to a stable internet connection, either Wi-Fi or cellular data.
2. Try opening a web browser to confirm that you have internet access.

Restart the myGMC App

1. Close the myGMC app completely.
2. On Windows, right-click the taskbar and select "Task Manager."
3. Look for the myGMC app in the list, select it, and click "End Task."
4. Reopen the myGMC app to see if the problem persists.

Login Verification

1. Make sure you are logged into the myGMC app with the correct credentials.
2. If you have forgotten your password, use the "Forgot Password?" feature to reset it.

Update the myGMC App

1. Check for updates for the myGMC app in the Microsoft Store.
2. If an update is available, install it. Updating can often resolve bugs and improve functionality.

Restart Your Vehicle

1. Get into your truck and try restarting it manually.
2. Once the vehicle is running, attempt to reconnect the myGMC app.

Check for Vehicle Compatibility

1. Verify that your vehicle is compatible with the myGMC app and can use the features you are trying to access.
2. You can check compatibility details on the official GMC website.

Clear App Cache (If Applicable)

1. Go to the settings on your mobile device.
2. Locate the myGMC app and select it.
3. Look for options to clear the cache or data and confirm the action.
4. Reopen the app to check for functionality.

Reach Out to GMC Support

1. If none of the above steps resolve the issue, contact GMC customer support for additional assistance.
2. Provide them with details about the error message and your vehicle information.

Taking these steps should help in troubleshooting the issue with the myGMC app and getting your truck started. If the error persists, GMC support would be well-equipped to assist you further - learn more - learn more.