"Check hybrid system" "Park on flat surface"

I could not find a thread on this particular problem. The car is a 2013 Prius 2 with 270k miles. Over the past few months we have been getting a strange error. Driving normal flat road (Highway or in town) dry pavement. The car will flash "Check Hybrid System" Then it will flash a second screen to place the car on flat surface and put into park. The odd part is the car wont go into Park. Today it happened and when we stopped at a light the car displayed the traction control light and the low tire pressure light. As soon as we started moving again those went away (Traction control and Low tire pressure). As soon as we got home I hooked up the code reader and no codes were in memory. The only way to get the car into park is to disconnect the Aux battery. Wait a few minutes and hook back up and all is good. The car will be fine for about a month or 2 before it does it again. Only 1 time were we able to get the car in park. Every other time it requires the Aux battery to be disconnected. One other thing that is strange. you cant turn the car off. The power button has no effect. Only thing that has been done to the car, Replaced Aux battery it was original. We thought this fixed it. The old battery was showing less than 12 volts. I also replaced brake pads and replaced the front hubs.

Any help will be greatly appreciated. If it would just throw a code I could try to narrow it down. The car drives fine with the Errors, just cant park or turn it off.

Todd

 

12.4 volts. Code reader, Torque pro. Just to add I bought an OEM Aux battery from the dealer

Thank you.

 

I will return it to the dealer for a check, Hopefully they will warranty it.

Thank you

 

I was actually wondering that, but I also do not have any CEL on.

Thank you

 

I did charge it before installing. I will pull it out tomorrow and check it and see if it will take a charge.

Thank you

 

Bisco,

I will do more extensive checking today. It is my girlfriends car. It was originally mine, I drove it from 217k to 241k miles then gave it to her and got another 2013 Prius five. When I had it, never had any issues other than the egr needing cleaning. Otherwise it was flawless for me.

Thank you so much for the help and ideas. Happy New Year!

Todd

 

I checked voltages today. 12.6 volts with car off no load, and 12.4 volts with car on in accessory mode. Those readings were taken this morning with car sitting in garage overnight.

For comparison, I checked my car 2013 Prius five. Aux battery car off 12.3 volts Car in accessory mode 12.0 volts. My car has never missed a beat since I have owned it from 180k miles to present 210k miles.

Thank you,
Todd