Now,, what is this about???

Google Toyota Owners.com and sign in and become a member. After you do that put the VIN number in for that car and you will be able to see all service work that has been performed by Toyota dealers on the car.

 

Hopefully the dealer was knowledgeable enough to check the inverter coolant pump to make sure it was working. If it's not working, there will be a number of codes that are set, which can be cleared again after things have cooled off. That pump was a dealer recall item, so it ought to show up in the Toyota records.

 

how many miles on her?

 

Get the codes from the mechanic. If they did not record them them get your money back from the mechanic
Check the 12v health
Buy code reader. (smartphone + app) is probably simplest for grandaughter
Ask seller if any similar problems

 

Most likely she left the door open, dome light on, something. A long multi-hour trip by a girl means that the dome light was turned on at somepoint and most likely not turned back to door or off. It sounds like a 12v problem. How long ago the 12v was replaced means diddly squat. I can buy a new battery discharge it the same day I buy it and destroy it. Just because it is less than a day old, doesn't mean it is working. Check the battery in the morning after it presumably hasn't been driven in a while with a voltmeter and the car off. Then again with the car in accessory mode, headlights on and rear defrost on. Then again with the car in READY.

You should read the resting aux battery voltage, the under load voltage, and the inverter output voltage (like alternator output).

The "wrong" battery in the Prius won't cause harm other than perhaps not getting a venting battery and installing that wrong since the battery is in the passenger compartment. They are small batteries. Think motorcycle or lawn-mower style. They go dead easily if abused or used like a standard big beefy cranking battery.

As to the dealer, without codes, it didn't happen. It sounds like they are just ragging on a great car and wanting to get a big payout in repairs for nothing. Any major problem has a code associated with it. If they don't have the codes, they shouldn't even be touching the car.

 

Les the dealer of record should be listed by those entries on Toyota.com. I
suggest you call them in the morning for more details. What a joke of a dealership that can't or won't provide codes. And they wonder why they get the wrap that they do.

 

That means they took the vehicle somewhere else for work to be done. Maybe they didn't have the batteries there?

 

Is the code coming back consistently? I would not depart with this car because of that. This is likely a dead/weak 12V battery or its connections. If your car has a problem, the code will be consistently there. I hate to see you lose out on a good deal because of a one time incident. Chances are, you won't have that problem again.

 

Nothing you want to be involved with.

http://stuff.jaygroh.com/prius/Prius%20Info/Official%20Toyota%20Info/Repair%20Information/Service%20Bulletins/M.I.L.%20ON%20DTC%20P0AA6%20OR%20P3009,%20INFORMATION%20CODES%20526%20&%20613.pdf

Google Search

 

This is like a nightmare unfolding before my eyes that I can't stop. I'm of the opinion that there is nothing wrong with this car. So it flagged a P0AA6, one time. That hardly points to a failed tranny. A failed tranny will consistently flag the code after resetting them. The key to these codes is consistency (esp if you have 12V power problems). This car sounds like a great, well maintained car (the proverbial old man's car that was dealer maintained). What would cause these tranny problems so early in its life? The Gen II tranny is built very solid and has an excellent reliability record.

This dealer sounds like a clown to me.

 

You make a good point that real problems will recur, but the converse is true as well: true problems can be intermittent.
Sounds to me like OP has to decide now whether to return the car. Personally, I would not gamble here. This is true 10 times over if the traction battery was recently replaced*.

*I say this because it makes me think that either the traction battery repair was poorly done, or was a misdiagnosis.

 

If there were intermittent problems, they would be reflected in the maintenance data on the Toyota owners website. If the traction battery was recently replaced, that's all the more bonus for this car. IMO, the gamble is trying to find another Prius this well maintained.

 

Is it displaying any codes right now????

 

That points even more to a $185 fix of replacing the 12v battery and not letting it die. "Won't crank" in the Prius means the 12v is beyond dead. No jumping or resuscitation is a true fix, only replacement. I have a dying 12v in my 2006 with a resting voltage in the 10.5v range meaning one cell is shorted. I leave it unattended for a week or more with the smart key system on and it still works. Lowest I have seen it get with a true Fluke DMM is 9v and the Prius still starts right up. This is because it only flips a couple relays in the back after priming the brake pump. If the battery can't do that, then it is beyond dead and needs to be replaced. So "won't crank" directly means dead 12v. The "cranking" of the motor is done by MG1 through the HV battery pack. And that would READY the car and then have a problem. Not just be dead out of the gate.

Sounds like you are dealing with a lot of incompetence.