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Lots of lights, sometimes P0a93

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PriusPaddler, Jan 31, 2024.

  1. dolj

    dolj Senior Member

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    As you have this code and report the inverter coolant reservoir shows no movement when the car is READY, that is a confirmed diagnosis of a failed inverter coolant pump. Whether you buy an OEM pump or something else is up to you but 99% of people who come back with feedback report no further issues after installing an OEM pump. The best price for these is obtained by using an online dealer parts store. Camelback Toyota and Olathe Toyota are two examples. Shop around as prices vary.

    I would also stress to be very wary of counterfeit coolant pumps which are rife on Amazon and even more so on eBay. Here is an interesting post on that subject: Counterfeit vs Real OEM Toyota Prius Inverter Pump 04000-32528
    Correct he has a rudimentary scanner as detailed in my post #17.
     
    #21 dolj, Feb 11, 2024
    Last edited: Feb 11, 2024
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  2. PriusPaddler

    PriusPaddler Member

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    So it would seem. Trying to connect with someone that has a decent scanner. The C1310 was not thrown the first time the problem happened (see above 3 ABS codes that may have been thrown then).

    Do not understand the connection between ABS/Hybrid and inverter pump. Is one of those codes a red herring?
     
  3. dolj

    dolj Senior Member

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    The inverter is part of the hybrid system, so if overheats and throws a code, the hybrid control system lets the ABS system know there will be no regen braking. The C1310 code is a "thanks for letting me know" type of code.
    No.
     
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  4. PriusPaddler

    PriusPaddler Member

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    Yes, I've read that thread on counterfeit. I think mine would be called a knock off as it didn't pretend to be Toyota, but clearly is a 'Duralast' or 'Dorman' brand or something. Thanks for the parts store recommendations. I will proceed with that repair even though it doesn't make sense to overheat in Minnesota. Pump still needs to work.
     
    #24 PriusPaddler, Feb 11, 2024
    Last edited: Feb 11, 2024
  5. PriusPaddler

    PriusPaddler Member

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    OK - I guess that makes sense. It may have thrown that the last two times I had the pump fail, but I wasn't reading ABS codes at the time so I wouldn't have known. Still doesn't make sense to overheat when it is 35 degrees outside, but guess I'm glad to find it now rather then when it's 80.

    Gonna go ahead and get the part and proceed to fix the known error.

    My scanner acquaintance is down with COVID at the moment, so he said to check back mid or late this week.
     
  6. dolj

    dolj Senior Member

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    I wasn't implying you bought a counterfeit, and probably third-party replacement would be an accurate (and legitimate) description. I was more thinking that if you're trying for an OEM online, make sure you don't get caught out getting a counterfeit. Usually, the price is too good to be true given a legitimate part is around $120-$130.
     
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  7. PriusPaddler

    PriusPaddler Member

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    You aren't kidding. Various online Toyota dealer parts stores sell that part from $85 to $219. That's a spread. Of course the $219 is in my city and the $85 doesn't have great reviews. Going with Olathe as it's on the lower end. Thank you again.
     
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  8. dolj

    dolj Senior Member

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    FYI, $85 is too low to be a genuine Toyota dealer. No surprises then on the reviews.
     
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  9. PriusPaddler

    PriusPaddler Member

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    I ordered part 04000-32528 but they are telling me that's not right for my VIN.

    Could that be true? Are there different parts for Gen 2 models?
     
  10. PriusPaddler

    PriusPaddler Member

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    G9020-47031 Is what they told me. I needed so I guess that's the part i'm ordering for sixty extra dollars.
     
  11. PriusPaddler

    PriusPaddler Member

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    I found several other threads but nothing really explained the price difference. One claimed
    That possibly one of those part numbers is the kit with gasket and one is just the pump.
     
  12. dolj

    dolj Senior Member

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    Yes, that is the correct part number for your 2009 Prius.

    I'm not sure where you got the other part number but from the description, it looks to be an electric engine coolant pump or maybe one of the other pumps that goes on a later model.

    The price parity is most likely because our cars are getting old and as time goes on part prices increase. Just a couple of years ago that pump could be had for $120.
     
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  13. PriusPaddler

    PriusPaddler Member

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    Update - now 311000 miles on the car (4k+ since problem in the OP).

    I bought the Toyota part to replace the second Autozone part... BUT, the last time I checked the coolant fluid, it WAS GURGLING and I was having no Red Triangles. So, I was stumped - did I really need the part replacement? Then... life. So the part is in the back of the car, and I've done nothing and it's been "fine."

    After no code since 2/11, it threw it again today. Almost 40 degrees, snow/slush and rainy again. About 2 hours of driving/idling while playing taxi for a child (mostly highway or idling while waiting). Then when I headed for home, got up to speed on a 65mph highway and BAM, red triangle was back.

    Pulled off at a gas station. Checked oil - it was fine. Checked codes. This time P0a93 and a C1300 from ABS codes. Checked coolant - NO GURGLING.

    So - I have intermittent gurgling, and before I dive in and replace the part I know is the likely culprit, I wonder if there is ANYTHING ELSE that could impede that pump when conditions are just right - rainy, slushy snow, temps just above freezing... anything?

    Guess I just want to feel confident the part will fix the issue. If it was a blown fuse, it wouldn't be intermittent right? (no action in fuse box in years, haven't even cracked it open) How would I check anything else electrical?

    I'm leaving the codes in there, in hopes that my friend with a better reader will be available soon for me to check on anything else logged.
     
  14. mr_guy_mann

    mr_guy_mann Senior Member

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    Some people on the forums have reported that some aftermarket pumps can just "not pump" when it wants to. And then maybe it will. Sometimes lasting less than a year.

    The OE pump can fail and pop the AM2 fuse, or it too can "not pump". However it seems to last around 100k miles.

    I always use pumps from Toyota, haven't had any problems with my car or any customers' cars.

    Posted via the PriusChat mobile app.
     
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  15. PriusPaddler

    PriusPaddler Member

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    But if that AM2 fuse is blown, the pump cannot work - right? So it would not be intermittent, but it couldn't work EVER if the fuse is blown.

    I think I'm resigned to just replacing it and see what's next. If there's some strange wiring issue, or something when the weather is slushy and wet, I guess I'll find out eventually. I've got the part, so might as well put it in. Now if the weather will just cooperate again.
     
  16. mr_guy_mann

    mr_guy_mann Senior Member

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    IF the pump fails (shorts out internally) where it blows the AM2 fuse, then the car won't work at all - it'll be "dead in the water". The dash won't turn on, won't go ready - nothing.

    That's ONE failure mode of the inverter pump.

    The second type of failure is where the pump just won't do anything. It won't pop the fuse, but it won't pump coolant either.

    Yes, I would install the Toyota pump.

    Posted via the PriusChat mobile app.
     
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  17. pasadena_commut

    pasadena_commut Senior Member

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    Gurgling as in making noises, or gurgling as in swirling in the reservoir (silently)? The only times I have ever heard a car make a gurgling noise was when there was a leak in the ICE cooling loop (the only one present on a conventional car). If it is really making noises how do you know it is in the inverter loop and not the ICE coolant loop? I suggest checking that both loops are full. That would be by reservoir level on inverter loop and (when the car is cold) top of filler neck on radiator and mid point of overflow container on ICE loop.

    I guess the inverter pump might make a noise you describe as gurgling. Use a mechanics stethoscope or long screwdriver or socket extension to verify that is the source of the sound. If it is, change it.
     
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  18. PriusPaddler

    PriusPaddler Member

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    Probably a bad choice of words - I think "turbulence" is what I have seen used here, but I do think it makes a noise I can hear as I watch it bubble (at the moment it is still and silent). The inverter reservoir is properly filled and level remains stable.

    I have not removed the plastic to check the ICE loop at all... I don't hear anything similar if I'm not opening and checking inside the inverter reservoir... My bad for choice of words.
     
  19. PriusPaddler

    PriusPaddler Member

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    OK - I was not able to connect with my acquaintance and get better scan results, but the new (Toyota) pump went in last night - thanks to my 24yo son. For my records, it went in at just over 312,000 miles. Drove about 5 miles today so far... but it's maybe 17 degrees out, so I don't expect any problems today unless my son forgot to reconnect something :)

    Now, to see if Autozone will give me my money back for the faulty part with the lifetime warranty.
     
  20. PriusPaddler

    PriusPaddler Member

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    No problem at Autozone except they insisted on returning it to "cash" although I bought with credit. The location where I bought it didn't have enough paper money so I had to drive a bit to get paid. Anyway, so far so good while driving. Hope to close this chapter out.