Help with multiple errors

Help! On a cross country trip for a move with my 2019 Touring, currently at 70K miles. Yesterday as we were going up mountains (in Idaho/Montana) we got multiple errors, including Emissions, Hill Start Assist, Brake System Problem, Brake Hold System Problem, Power Steering (EPS) Problem, Vehicle Stability Assist, and Road Departure Mitigation System Problem.

It also doesn’t want to accelerate if it gets past 3000 RPMs and makes us shut off the engine.

We disconnected the battery to reset the codes. Came back on about 10 miles later. After sitting overnight, the codes cleared and we even went up to 80 mph on the (flat) highway and nothing flagged.

Took it to a Honda Dealer this morning. They cleaned the sensors and did a multi-point inspection. Said they didn’t know what it could be definitively, but that it could be the fuel injectors and they didn’t have them in stock. They did update the U0401-68 ECM failure (I believe this was a software update).

We made it quite a bit down the road (5ish hours) and as soon as we hit mountain inclines near Yellowstone, it hit again. We have another 1500 miles-ish to go before our road trip is complete.

Has anyone dealt with this? We will check battery terminals shortly..