Mo Prius, Mo Problems lol. Just need help with codes! thanks

The main problem is you have a bad HV battery. That needs to be changed. Depending on what state you live in, it may or may not be under warranty

 

oh I confused the codes. Yours is P0A08, not P0A80. Sounds like someone jump started the car incorrectly

 

if it was a cross connected jump, the main 100 amp fuse would be fried.

 

No, if the big $200+ fuse (correctly known as the DC/DC 100A fusible link) was blown, your car would not be drivable and you would also get a whole different set of DTC's.

There should be another screen you can go to for each trouble code that will actually give you the plain english meaning for each DTC. Look for that. There are other more knowledgable PC's who can give you expanded detail info, so hopefully they will chime in at some point.

 

As you're starting to see, in order for you to best be able to fix your car, and avoid confusion when the rest of us (even with the best of intentions) might mix stuff up, you need to be building up your own knowledge about the car so you're not relying only on an internet forum to solve your car's problems. We all like to help and you can get a lot of help here, but it just works better for everybody, especially you, when we can be working with you and not instead of you. It also occasionally happens on the forum that you'll get a bunch of different suggestions and some may be a bit off the wall (hey, it happens!) and you're better off when you're able to spot those so they won't cost you too much time.

That all means you'll give yourself a huge advantage if you know where to go straight to the information you're trying to get. It's in the service manuals for your car at techinfo.toyota.com.

You've made a good start on your problems by using Techstream and finding the codes the computers wanted to tell you about. Your natural next questions are (a) what do those codes mean, and (b) what are the necessary steps to find what's causing them. That information is in volume 1 of your service manual at techinfo. When you know where to find it yourself, that means you can be an informed PC member and use the rest of us on PC for help and clarification and additional hints, and you'll be able to make progress on your own even when we're away from our keyboards or if we occasionally get things mixed up.

Cheers,
-Chap

 

What is the accident history of this car? Does it by chance have a salvage title? How far have you driven the car with all of these codes present?

I would suggest that you measure voltage across the 12V battery when the Prius is READY. If you measure ~13.8V then the DC/DC converter and the 100A DC/DC fusible link are both OK. This would mean that a botched jumpstart is not among the car's problems.

Assuming that your measurement is consistent with the above, then the likely cause of P0A08 and P0A09 is a bad wiring harness connection and that may not be easy to pin down. So it would be good to know what physical damage the car has sustained as that may provide you a clue about where to look for wiring harness damage.

The Toyota repair manual will provide advice regarding how to verify the wiring connections between the hybrid vehicle ECU in the dashboard, and the DC/DC converter located within the inverter.

 

Regarding the inverter coolant pump and whether it is working or not, make the Prius READY and look for turbulence in the inverter coolant reservoir. If you do not see fluid turbulence then the pump is not working and that is definitely one of your car's problems.

If you measure 14.1V when the Prius is READY, then the DC/DC converter is working and the DC/DC fusible link is fine. So the question is why DTC P0A08 is being posted. You'll need to verify the wiring harness connection between the inverter and the hybrid vehicle ECU, subscribe to techinfo.toyota.com if this is a task you wish to DIY.

The Prius battery measuring 12.18V when the car is not running is not a very good measurement and the battery is close to discharged. Put the 12V battery on a charger, at least overnight, 4A charging rate. See if the resting battery voltage will improve after the charging process has been discontinued at least 8 hours.

 

See the attached image that shows the invert coolant tank. Take the lid off and peer in - this is where Patrick is saying you should see turbulence when the car is "READY"



I don't think you will really hear the inverter coolant pump as it is not really a loud noise, this is why we look for turbulence.

hope this helps.

 

The inverter coolant pump is located behind the driver's side headlight assembly, and in front of the main relay/fuse box next to the inverter. It makes a slight whining noise.

 

You will need to check the wiring harness between the inverter and the hybrid vehicle ECU as I suggested in my post #13 above. Remove the lower glove compartment and look at the wiring to the engine and hybrid vehicle ECUs which are located to the right of the passenger cabin blower assembly. If you see obvious damage (for example, from rodent infestation) that must be fixed. If the wiring appears OK then you need to obtain the factory repair manual info to identify the wiring that must be verified.