Can I use a 2006 HV battery pack in a 2009?

I've been trying to help a friend get back on the road. Their car went to the dealer after the Master Warning, Brake and VSC warning lights came on. The dealer said, "pulled codes P3000, P0AFA, P0AC0. Hybrid codes C1241, C1300, C2300, C2318, B1421. Hybrid battery has cell in reverse polarity and fault with hybrid ECU. Aux battery has only 5 volts. Recommend replacing battery, hybrid battery and HV ECU."

Car has 117,000 miles. I did not find any cell in reverse polarity. ECU sensing wire terminals have some corrosion and maybe the ECU isn't getting proper voltage signal???

So, they towed it to me and asked me to assess. I put the HV battery on my "Prolong" charger and after 36 hours it would not charge past 228 volts. I put it back in and test drove. On initial start, battery had 6 blue bars. Same warning lights still on. I drove 22 miles to O'Reilly's to purchase a cheap code reader that would erase codes. On the return trip, at about 30 miles in, I got green bars. Drivablility seemed close to normal throughout. Once back at my shop I cleared the codes, which, according to the INNOVA cheapie, now are only 1259 and 1310. They reset immediately. I'm thinking the HV ECU may truly have a problem but not sure if it might all be resolved by rejuvenating the battery (see below on that subject).

I have a 2006 battery pack under the bench with 60,000 miles on it. It's been sitting there for about 6 years. I put it on the charger and it came up to 230v after a couple hours and is still charging. I'm tempted to throw it in the 2009 while I see if I can restore the 2009 HV battery with the Prolong system.

I purchased and used the Prolong system for my 2007 when it started showing signs of a failing battery at around 230,000 miles with mileage down to 44mpg and recurring recalibration occurring more often. I am now approaching 300,000 miles on that one and getting a solid 50mpg.

I'm asking if there is someone out there that has the definitive answer as to whether I can swap out the 2006 for the 2009. The 2006 pack has a part number of G9280-47100. The 2009 part number is G9280-47110. Also, the HV ECUs inside the packs have slightly different numbers. And thanks to PriusChat for being there.

 

Thanks for that. You are correct about the HV-ECU part numbers. Sounds like you have experience swapping packs around. I'll let my 2006 get a full 24 hours equalizing charge and install tomorrow and let you know what happens. BTW, I forgot to mention in my long intro. that I did put in a new 12v battery.

 

Well, after a good topping charge, installed the 2006 HV battery with its original HV ECU and no change. Codes 1259 and 1310 still showing up after clearing. Warning lights still on. Any ideas where to go looking next?

 

I see I've using the wrong terminology for the battery ECU (calling it the HV ECU). Does anyone have a known good HV ECU (not battery ECU, but the one under the right side of the dash) to sell? According to two friendly shops near here that scanned for me they are pretty sure the HV ECU has problems as most codes point to it along with the scid control ECU.
As a reminder, I've replaced the traction battery with a known good one and am still getting the same codes. So, at the very least I've confirmed that what the dealer recommended, replacing the traction battery, was not necessary but they DID diagnose the HV ECU at $964.43 for the part plus labor to install.
One of the local shops said even if I did replace the HV ECU, the dealer would need to flash it. I think he was referring to something I read about elsewhere in Prius Chat about pairing this ECU with the immobilizer ECU which seems pretty straight forward so long as the auxiliary battery is in good shape.

 

Thanks. I'm clear on the differences between the battery and HV ECUs now. So I think what my local independent tech told me about flashing (pairing) the new HV ECU (the one under the dash) with the immobilizer ECU is still a valid point. What you are saying I fully understand. The battery ECU needs no flashing and corrosion at the battery terminal sensing wires is a common problem. And if you know anyone with a good HV ECU to sell let me know. The dealer invoice says it's part #8989047092.

 

I'm glad you caught that because I thought it was a newer part number for the HV ECU. So the dealer really was off the mark entirely. I guess the only answer is to make that little investment in the patch cord and software and learn it all myself using Prius Chat's knowledge base. Thank you.

 

Okay recapping now that I have done more. Car originally towed to the dealer after the Master Warning, Brake, VSC and engine warning lights came on. The dealer said, "pulled codes P3000, P0AFA, P0AC0. Hybrid codes C1241, C1300, C2300, C2318, B1421. Hybrid battery has cell in reverse polarity and fault with hybrid ECU. Aux battery has only 5 volts. Recommend replacing battery, hybrid battery and HV ECU."

Installed a new 12v battery. Installed a known good traction battery with its own ECU. (I could not find a cell in reverse polarity in the original battery) No change, same codes and lights. I installed a known good Hybrid Vehicle ECU from my own 2007, paired with the immobilizer system as per other Chat guidance. Cleared codes. No change. Same lights, codes returned.

Interesting item - my cheapie O'Reilly's INNOVA reader says no DT codes and when I go to the ABS section this reader shows C1259 and C1310. (C1259 - HV System Regenerative Malfunction, C1310 - 1 Active Booster Solenoid 2 HV System Malfunction) according to INNOVA. Then I ordered a ScanGauge 2 and it shows only one code - P3030 which points to the battery ECU and/or sensing wires. I cleaned and checked all the sensing wires and bus bars on the battery that is currently in the car. It took a topping charge nicely and I really don't suspect anything wrong with that battery and its ECU.

So, at this point all I have been able to determine is that the dealer's recommendation would not have solved the problem(s). I don't have a disposable laptop to load Techstream and I get totally frustrated trying to figure out where to download Techstream and which lead to order anyway.

Bottom line, can anyone recommend a shop in the Portland Oregon area that has the necessary talent to figure this one out?

 

I used he word "pack" incorrectly. By pack I meant the entire traction battery. I am actually on the coast west of Portland in Nehalem. The owners of the car , on my advice, are looking at purchasing a 2013 Prius and giving up on this one. If you wish to help it will be necessary to involve them in the discussion. Thank you for your sincere response.