2021 diesel Tahoe engine turn off when driving

[dbphillips]

2021 ST Tahoe diesel 4wd.
48,000 miles

No problems until while driving city streets speed my Tahoe’s engine turns off, shifts to neutral, electronics stay on.

I have to put flashers on, pull over to a full stop then restart the engine. It always cranks right up like nothing happened. There are no other symptoms before or after. The incident does not trigger any engine error codes at the dealership.

Any suggestions?

Misrouted harness and subsequent wear. Look it up in recalls. In particular look near the alternator bracket. Do you ever get weird dashboard messages regarding brakes and cruise control and collision avoidance system? Should get some codes, but if the ECM has a power interruption, maybe not.