PLEASE HELP WITH WHERE TO START!!!

I can’t read the spreadsheet on my phone and a picture of the warning lights is useless.

 

Screen grab from the spreadsheet:

 

Here's where I would start. I seriously question some of those codes. The P0311 makes no sense to me. I'm going to assume many of the others are false also.

The P0A80....that is probably real, as the P3017 and 3018 back it up.

Since you have a hard copy of codes, disconnect the 12v battery, charge it up external to the car if needed(use a low amp charger, IIRC you shouldn't exceed 4(?) amps. While the battery is charging, verify all fuses are good. Hook the battery back up and see what the car does. Don't close the trunk while the battery is disconnected.

I did some experiments a while back on a few HV batteries. This link shows the dash lights received. The dash photo is somewhere in the first 10 posts I believe.

Just Another HV Battery Thread and Experiments | PriusChat

 

Check the battery voltage first before anything else. It’s free and that many codes is odd.

 

Here's a pdf:

 

+1

Agreed, I think a new HV battery is in your mother's future.

 

What obd device are you using that’s alot of codes most I have never seen before.

If the car spends it’s life with nothing but short trips it will not be a happy camper. It needs a nice long trip quite frequently to charge up the battery’s.

One thing I can guarantee you is if the back seat hybrid battery cooling fan is on all the time it’s got a bad hybrid battery.
Personally I would not put alot of money into this car. You can sell it like it is for a couple of grand.

A high milage old Prius is a nightmare for someone with no diy skills both mechanical and electrical.

Lastly an old Prius does not project success to potential clients. It is the wrong car for that profession.
Image image image.

 

+1 ^ What OBD reader did you use? If not Techstream or a clone, from a Toyota Dealership or a known OBD II reader that is compatible with the Prius then the majority of those codes are suspect at best. However, I would also agree you will most likely be in the market for a new HV battery based on the symptoms you have described. The original HV battery lasted 14 years which pretty good since the estimated service life is 10-11. But first confirm the OBD II reader's compatibility.

 

Here's where I would start:
Have the 12 V battery load tested and replace as necessary.

After that, it the trouble continues:
Start looking for a different car.
Most any car that is 14 years old with 200K miles is likely to have several things worn out ......and over the next two years she might spend MORE than the cost of a replacement car just on repairs.

 

You didn't mention how old the 12v battery is. They usually last 5 years and when they go bad, they die quickly and charge quickly. They can run up to 18 volts when in operation and this wreaks havoc with the computers and sensors who are expecting 13.5 volts to do their jobs. Look at the codes. Voltages are high/ sensors are above normal.Add to this a possible short in the battery when it gets hot and you can have what the diagnostic computer thinks is a "short to ground" in many of the other computers. And the car will run like dirt or not run at all. All of the computers are run from this 12 volt battery.As far as the driver's wheel noise, it could be a parking brake cable sticking which could give the ABS codes that weren't already caused by the battery effecting the ABS computer. Jack up the car and see if the wheel is sticking. If ancient, replace the 12 volt battery so that the correct scan tool will have a fighting chance at it's job. Clear the codes and then recheck them to see if you also need the expensive hybrid battery. If it does, then look around the car and add up everything it needs (brakes,tires,tune-up,hoses,etc). Compare to how much the car is worth. Money might be better spent as a down payment on something newer. Good luck!

 

Flood vehicle Run Like He11

 

Why is the battery cooling fan on all the time? And why does the battery overheat?
Maybe the battery cooling fan is clogged? Try to clean it. For example, you can look here: How to Clean the Battery-Cooling Fan in a 2004–2009 Toyota Prius - AxleAddict

 

I'm sure in the intervening 28 months the OP sorted this.

 

Ha!
Yes, I hope...