2007 Toyota Prius broke down with several hybrid system codes, but shops says it's actually fine?

Needs to be looked at by a hybrid specialist. Not sure, but here is a possibility. Luscious Garage | Blog | Gen 2 Prius (2004-2009) Transmission Failure, P0AA6, P0A92, P0A7A

 

I think Avi is on the right track.

If the 12v checks out fine, I would I would say you are likely headed for a very expensive repair in the near future.

 

Good or bad 12V battery, you have a bigger battle to win.

Doesn't look good based Luscious' Garage experience, documented in the article above.
Bad News: You got bad service from the dealership you went to for a diagnosis (DARCARS Toyota in Silver Spring).
Good News: 1) The article from Luscious has a lot of documented information which a knowledgeable Technician should understand.
2) Luscious also refers to a TSB (Toyota Service Bulletin), which should help you out; attached below.
3) I believe Maryland adopted the CARB (California Air Resource Board) Emissions standard, beginning for 2007 model year and
later vehicles; hopefully this vehicle has always been in a CARB state.
4) Insist that your transaxle be covered under the CARB warranty as indicated in the attached TSB.
5) Dealership will be getting the warranty work, so there is a benefit for them.


My 2007 transaxle was covered under the CARB warranty in Feb 2011, at 99,114 miles. No codes of any type were displayed. The car (rather the transaxle) was just making a consistent, rotational type noise, that increased in frequency and loudness, as the car went faster. Initially denied, bummed, out $100 for the trouble shooting fee, I was contemplating a repair or buying a used vehicle. However, the service advisor called me back a week later with the good news of warranty coverage. Clearly this service advisor went to bat for me, because he wanted the warranty work; I didn't even ask for this, and was already resigned to a repair or another used car. Push the lazy service advisor. You will likely be provided a rental while the transaxle is being replaced too.

 

Watch the battery, and don't worry. If it was a low 12 volt battery, all sorts of failures could be false positives

 

Chrissy,
I don't know how to say any other way but, you car is completely fine. It is extremely likely (like 99.99%) that your 12V battery became drained while it was out of commission. I do not think you should worry any more and... Have fun in Leesburg.

 

I disagree that your car is completely fine. Rather, it has an intermittent high voltage ground fault which will eventually reappear.

Now, it would be OK for you to drive the car on a road trip except that once this fault is logged, the car will refuse to start. So, as a workaround, if you are prepared to disconnect the 12V battery for a few minutes, then reconnect it, you will be able to make the Prius READY and drive away.

The purpose of disconnecting the battery is to allow the various ECUs to power down and reset. This clears the DTC memory in the hybrid vehicle ECU which is the one logging the serious failure codes.

So I suggest that you make sure you can find the 12V battery and are prepared to disconnect the negative battery cable where it bolts to the body. A 10 mm socket and a 3/8" socket wrench would work well for this purpose.

Good luck.

 

Read the article from Luscious Garage garage above. Then see if it matches up with the issue that your Prius is exhibiting.

Please keep us up to date if the symptoms return.

 

Well this looks like a case of too many hands spoil the soup so I'm bowing out but my assessment is that the 12V became weak/discharged and caused the problems. I'd be very surprised if you have problems with it in the near future.

 

Thanks for the update, looks like usnavystgc was correct with his assessment!

Chrissy, if you have driven 2K miles or more without a recurrence of those DTC being logged, I would agree your car is good and there no longer would be reason for concern. Good luck.