Chris, Thanks for the feedback. This is actually the second time I’ve had issues. The first time back in November, the GPS did have the red line across GPS in the corner. That time they replaced the shark fin on the roof because water seeped in around the antenna. That immediately fixed the problem. That time it was only the GPS that went wonky.
Now the GPS screen just wanders, I have a video but it’s too big to post.
The other symptom is that when my iPod is attached, the car system switches back and forth between the Apple Car Play and the GMC Infotainment system. The iPod is connected by the USB port. It dosen’t matter which port and it doesn’t happen all the time.
Both GPS wandering and iPod issues happen at the same intermittent frequency.
The rational from the tech is that low voltage causes strange thing to happen down stream of the low voltage event. ( My words not his).
I do want to avoid the ‘just keep switching out parts until the money runs out or the issue is fixed method of troubleshooting “
Maybe I need to visit your shop? I’m on the shores of Lake Murray visiting for a few days.