Dealership says I need a new HV battery AND ALSO that I need a new battery ECU. True?

A new battery ECU cost $800 a few years ago and a battery pack cost $1900. The ripoffs at the stealerships are soaring to all new heights...

Meanwhile a used battery ECU for your Prius is available on Ebay for $100... Alternatively you could go with a company like hybrid2go or greenbean or greentechauto and they'll install a rebuilt pack with a warranty and the ECU will be part of the pack they swap out at no charge to you. And granted the days of lifetime warranties are over from these folks, but the convenience of them showing up and swapping out a pack under warranty free of charge, with no ECU worries, in less than an hour is a great deal.

There's other more affordable options too, like my buddy professor Joe is selling gen2 battery packs with Gen4 (2016-2022) modules for $1800: Refurbished Hybrid Batteries | About us | 2nd Life Battery It'd be worth finding out how soon he's back in stock of those packs because they're as close to new OEM as you're gonna get.

And because you're in the same state as me, maybe you live close to me in the Olympia area? I got all kinds of packs to choose from in just about every type, except brand new OEM. I got a couple OEM packs from Gen3 Prius that haven't failed yet that I'd give you a ridiculously low PriusChat discount on.

In other words I'd save your money and not give it all to the stealership when so many other afford options exist, especially because NiMH battery chemistry is inferior to the performance of Sodium-Ion in every way. It's one of the only ways you'll get a sense that you upgrade the all around electrical performance of your Prius.

I'm also a certified installer for sodium-ion battery packs and can give you a really great price on an install and unlimited tech support if you use my affiliate link in signature below.

 

why not have your mech install a new oem?

 

To be honest about it the battery ECU usually gets cleaned and is fine generally I e a few hanging round . Unscrew silver back clean up the mess no broken pins wella. That crap must be clean of the powdery crap

 

Dealership and most reputable Prius hybrid specialist shops likely will recommend a battery ECU along with the new HV battery. The ECU orange harness pins seem to have a common corrosion problem. Typically, the 3 ECU pins are heavily corroded and the orange harness will show signs of burnt marks. They're selling the service, labor, and warranty. A new ECU paired with a new battery increases their profit margin and also service reliability so that you don't come back months later with trouble codes because the old ECU failed or glitches out. The technician isn't going to open the old ECU and do bench work on cleaning and refurbishing corroded pins.

Dealership shop will not touch any used parts. A new ECU part 89890-47092 runs at least $1K. Used pulled units seem to cost around $100. When the dealer installs the new OEM HV battery, the ECU, main relays, terminals, etc all come off as one unit from your current pack and moved into the new battery pack. The ECU can be easily swapped out while they do this work.The new battery includes the brand new battery harness.

A independent hybrid specialist shop who is willing to sell a brand new Toyota OEM HV battery for $2300 OTD also recommended that I inspect the ECU and either replace with a new part or find a good condition used part.

Old thread RE cooked ecu pins: Gen 2 Traction Battery ECU board connector replacement | PriusChat

DIY ECU connector replacement: The battery fires at ECU sense connector thread | Page 8 | PriusChat

 

Aren't the pins on the ECU gold plated? Followed the links above and the one to an Aliexpress link that worked:

https://www.aliexpress.us/item/3256803453801374.html?gatewayAdapt=glo2usa4itemAdapt

shows tin plated pins. In general, over all environments, gold plated pins usually outlive tin plated ones. For instance:

Are Gold-Plated Contacts Really Better Than Tin? - CEPRO

 

I think chap or somebody well versed in electronics world should be able to know how to get orange it can be done . It may be different color .

 

getting orange can be a challenge

 

If you're buying a brand new OEM pack the warranty is irrelevant on the physical pack its going to go 10 years or longer without issue. I've never seen an exception to this yet other than in the early 2000's for reason I won't go into. However if a shop installs a pack and they screwed up the install, having a warranty on the work would be wise.

Currently shops are trying to get away from new OEM packs because the prices are so high from the Toyota they can't add much on top of that to cover their purchasing and pickup costs. Nexpower, for example, is primarily selling Sodium-Ion packs in bulk orders to shops these days because their customer service costs for DIY installs are huge and the current demand from shops wanting to stock up on spare packs for the Summer months is way higher than individual buyers.

 

Another option is to sell the 100k Prius as is for $2000, plus the $5000 you are ready to pay the dealer and use the $7,000 to get a newer Toyota. Especially if you like to add a couple of thousand more to get a low mileage 2014+.

Is the paint excellent, interior nice and tires new? Remember it still will be an old car with high risk for other repairs like the expensive brake actuator or an AC evaporator.