P0335 code 2018 TRDSport

I had a really rough start this morning, took about 15 minutes to finally get her cranked up and running. First few attempts , just got a click and no attempt to turn over. When it finally started, the engine took about 7 seconds to actually fire once the starter engaged.

It’s been running fine all morning since then, and the only issues Ive had prior to this were a few times not starting without applying the starter fob to the push button. I had originally attributed that to a failing fob battery but now I think it may be the vehicles battery. It was 3°F at my place this morning.
Thoughts? Definite battery? Or am I putting in the shop for a full diagnostic ?

 

Light has disappeared in its own now. Has me leaning towards battery beginning to fail, and not adjusting well to extreme temperatures. We’re up into the high 20’s now and the problems resolved itself.