How to stop OnStar from sending fault messages?

You need to check the maintenance manual of the vehicle, find the fuse of the OnStar system, unplug the fuse, and the OnStar system will be shut down without sending fault information. Or you need to add a switch to the power supply of OnStar module. You can turn on the OnStar system when it is needed, and turn off the OnStar system when it is not needed. You can also shut down the OnStar system by shutting down or removing the modules of the OnStar system.

For vehicles with OnStar system, if you need to unbind, you can press the blue button on the rearview mirror and contact OnStar's customer service staff. Let the customer service staff untie the information of the vehicle and the owner.