P0A93 Code on Highway

Hi all,

Very quickly first. Thank all of you for a great forum. I have lurked here for so much useful information.

My wife and I have an 09 Prius with 72,000 miles. It has a 2.5 year old O'Reilly AGM replacement battery in it with no historical maintenance issues.

She drives about 18 miles on the interstate for work each day. On monday on the way home, it was in the high 80's outside, she was going about 73 mph with the air on and got a lot of lights on the dash shortly before arriving home.

When she got home I scanned the codes:
P0A93 Inverter A Cooling System Performance
C1241 Low Batter Positive Voltage or Abnormally High Battery Positive Voltage
C1242 Open Circuit In IG2 Circuit

I used all the great posts here and tested the Inverter pump by letting the system cool, popping the reservoir and hitting power twice. I could hear and see the pump working no problem.

I then tested resting battery voltage via the Display+headlights three times trick and it was sitting at 12.1 volts this was about 1.5 hours after returning home. I reset the codes and took it on a 15 minute drive with no issue. After returning home i immediately tested resting voltage and got 12.4 volts. The next day I had her test it before she left to go home and got 12.4 volts.

Today on the way home from work again we have the same issue with only the P0A93 code.
30 minutes after returning home, resting voltage on the touch display was 12.4v. If i ran medium ac and headlights it was 11.7. the pump is again still working.

Any guidance? Is it a battery?

 

Can these have an intermittancy? I had thought they failed completely. Thank you so much for the insight. I looked up our VIN with Toyota on recalls and the pump recall is still out there on this one. I hope there's a chance that will cover it

 

thanks as well for taking the time to reply. I thought this would be the case and I appreciate some guidance. Luckily I was able to cold call the local Toyota dealership and they agreed to replace it under the recall from 9 years ago. This car never had it. Its original owner was in their 90's and bought it new in 09. We bought it from our friend, their son, in 2016 with only 11,000 miles so they never took it anywhere or had any recalls done!