2019 5.3 smoking on cold start, exhaust smell in reverse through AC

[shock]

I've noticed an exhaust smell through my vents when I back into the garage since I've had it.

Yesterday I noticed it is pumping a small but not insignificant amount of blue smoke from the tailpipe on a cold start.

Currently at 15K miles. I bought it Jan 2021 @ 9K miles.

It is under b2b warranty for three more months.

Any idea what the most likely culprit is here?

 

[Blackcar]

You should have 5-year power train warranty still have time to figure this out. If running rich you should have codes set. Keep eye on oil usage.

 

[BlaineBug]

I've noticed an exhaust smell through my vents when I back into the garage since I've had it.

Yesterday I noticed it is pumping a small but not insignificant amount of blue smoke from the tailpipe on a cold start.

Currently at 15K miles. I bought it Jan 2021 @ 9K miles.

It is under b2b warranty for three more months.

Any idea what the most likely culprit is here?

If I start in the garage even with the garage door open I too get a very strong exhaust odor in the cab. Just the nature of the beast since I've owned it!