2010 with P2103 code

On Wednesday my boy forgot the dome lights on overnight. Thursday morning in the MN -20F weather the battery was pretty run down. I got the battery out of the car into my heated garage and proceeded to thaw it out. It had about 11v when I brought it in. Have it about an hour with a fan on it to warm up then charged for about four hours. It took a full charge and seemed to be ok.
Put it back in the car and everything started up fine. Kids drove it to school on Friday no issues.

This morning my boy goes to use the car and the triangle and check engine lights are on and main display says check hybrid system. Torque says I have P2103 Throttle Actuator Control Motor Circuit High.

Car starts and idles ok. If I stomp the gas pedal it does rev the engine. Haven’t tried to drive it yet. Torque says 14.6v on the battery. HV battery is like 7/8 bars.

Does anyone have thoughts or suggestions on where to start troubleshooting?

 

Yeah I’d suspect I’ve got a surface charge on the battery after running for 10 min. Will check the battery voltage after sitting overnight.

 

Do I need to clear the code before I test again? Assuming the battery is still in the 12.6v range after surface charge is gone.

 

Battery this morning is at 12.18v or 55% SoC from what my charger says. It is -6F outside today. Ran the engine for about 10 min last night and this is about 16 hours later.
Have the charger on it now will clear the code and see if it goes away. Suspect battery took more of a beating than I’d hoped when it discharged the other day.

Anyone else have thoughts?

 

Battery finished charging. Pulled the negative cable for a minute and started it up. No codes at the moment.
I went out for a little drive (still -5F) and it drained the hybrid battery down to like 40% going 55 mph and when I’d slow down the engine would rev quite high. I’m thinking this was some low power/cold mode as it seemed to get better after running for a while and my HV battery came back up to 60% of so after a little bit.
I’ll check the 12v tomorrow morning and see what SoC it has. I’d bet it is low again.

 

Already back to 12.18v a few hours later and one short trip in town. Looks like I’m buying a battery