Stalled and No Crank/ No Start

[brianf60]

I went to the store this afternoon and because of Covid you have to wait in the parking lot got them to bring your order out. I was parked about 2 minutes with the engine idling and it stalled. The display said Reduced Engine Power   and  Service ESC. The truck wouldn't crank over. I scanned it with my code reader and it has U0100 Lost Communication with ECM. After about 5 minutes my order arrived and loaded up and the truck started up. Engine light is still on. Anyone had this occur? The engine light came on  a few months ago and went out before I could get an appointment with the dealer. Shortly after there was a recall so I had that performed. I guess I will call tomorrow and find out if I can get it in. Not sure what the service is like here in Ontario with Covid-19. A lot of business are closed...

2019 GMC Sierra Elevation 5.3

[brianf60]

Well the dealer said it needed the BSCM reprogrammed. But he didn’t sound too confident when I talk to him. We will see.