Do I fix or let it go...

Well it never rains in California. So your car should be in near perfect condition or it isn't by looking at it. So there are issues possibly there also generally you shouldn't need all those things done to a Prius It is possible yours is so old it's like one of the first generation twos in the system I mean in California you should be able to step up to an '09 that's in a little bit better condition than what you have be about 5 years newer so on and so forth. I just bought a leather interior two of them here in Central North Carolina and I don't have $2,000 in both the cars and they both look better than very presentable no splits in the leather everything is clean inside outside everything is relatively straight and clean one green one silver one has a code the other has nothing going on I am certain if one desired they could do the same in California if not a little better. People in California are keeping up with the Joneses they're buying Hyundai Ionic 5s things like that an old Prius doesn't interest very many people in that part of the country they've got to keep up with the folks that live next door and all that so there's a lot of things that play and a lot of used cars in California lots of them I imagine they get drug out to the desert because they can't be sold like everything else. So look into this very hard East LA there's a lot of Spanish guys that know a lot about these cars that can fix you up of course there may be generational social and other gaps that prevent some folks from doing business like this I don't know.

 

I think it's time to say goodbye to your mechanic.

Think this out.
Your wrench 'thinks' that the traction battery AND the power-split device (transaxle) AND the inverter all went bed at the exact same time?
REALLY?

If the G2 is in otherwise pristine condition I would strongly recommend getting a second opinion.
The traction battery is DIY replaceable for about $1200, and the transaxle and inverter replacement are an easy swap-out with a re-manned unit for a couple thou each - but if you're stuck paying a mechanic who is trouble-shooting which component lit up all of those pretty lights by easter-egging the problem on your dime at inflated prices - I'd consider buying a newer non-hybrid, non-Toyota vehicle.

Even when gas is more than $3 a gallon, and it's almost that much HERE, you're looking at spending thousands on a car that's only worth a few thousand to save a few hundred bucks in gas.

That MIGHT be the wiser move in the end.....but NOT with the mechanic you're using.

GET A SECOND OPINION.

 

You need to invest a little more time in this. First off is HV battery, torque pro or Dr Prius app and a dongle will tell you what is really going on. If the 12V battery is toast just charge it and do the tests. Driving in the mountains is the hardest on the battery, if you can get the car to start and see if the engine charges up the battery you will see if the trans is good or bad.
It seems like the new mechanic is not helping a lot now, time to do some research on your own. You might also want to find a local shop that specializes in hybrids and maybe sells reconditioned ones. Worst case trade yours in on another one they have gone thru and maybe offer a warranty.

 

You can buy whole cars out of people's yards where people park them because of the HV battery seriously. You know the ones the dirt on the windshield and glass is so thick it's protecting the interior It's been sitting there maybe a couple years the tires are turning white they parked it where they put it It didn't die there they pulled it there and parked it because they won't going to spend $3,000 or $5,000 on a battery blah blah blah now you can get the whole car for $300 to get it out of their side yard or whatever I buy them all the time or whenever I want to I can't clutter up the yard that much even though I have a lot of space you know I can only drive so many cars. But cars in this situation are just sitting all over literally the car has blended in with the landscape and many people have forgotten them oh yeah there is that old funny nice person car out there in the back what do you give for it exactly be more of a chore for them to find the title.

 

How close to San Francisco are you? If pretty close take it to Earthling Automotive (formerly Luscious Garage). They specialize in Hybrids and now EVs. Look around on YouTube (under the old name) and there are many videos from them showing different Prius repair jobs. If they say it needs all that stuff then it really does. I would bet though that it doesn't, perhaps just a new battery pack?

 

looks like the tranny and combo meter. i agree with above, take it to earthling for a second opinion.

you can make a better decision then. to me, it might be worth the car loan to pick up a corolla or similar vehicle.

 

Sounds like this mechanic is just making up outrageous prices because he doesn't like working on old hybrids. The error codes have confused this mechanic and it's likely not all the problems they think it is and at worse its time to replace your hybrid battery pack and add a capacitor to your combination meter. I often install these packs for a few hundred dollars in labor and the Combination meter jobs is about $100 in labor. And if you use my affiliate link I can give you a discount on the install when I'm in California next month: https://projectlithium.com/?ref=9qLPw

 

Definitely worth figuring out what's wrong. These cars are pretty cheap to work on if it's replacing a few modules or an ECU.

I've been going through a similar problem, and it's going to cost me less than $100 most likely to get back on the road doing the work myself.

 

First do not panic because there is some hope.

For example the instrument cluster (combination meter) can be fixed for $150-$200 including labor. Check online auction sites for service near your location.

The HV battery can be repaired professionally with a few replacements modules and rebalancing for $550-$800. Many people offer this service. Just find someone experienced and with the proper setup.

Inverter and or transmission is extremely unlikely to go bad at the same time. The codes definitely do no say that. I would pay $150 diagnostic fee to a Toyota dealer to get a second opinion. I am pretty sure none or only one might need replacement. If it does get a quote from an independent shop using a used part. Check prices on online auction sites and expect to pay just a few hundred for the used transmission or the used inverter including warranty and a few hours of labor.