Light water damage -- car really unsalvageable?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by brka-brkb, Aug 13, 2025.

  1. brka-brkb

    brka-brkb New Member

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    Good afternoon!

    My 2005 Prius sustained a light water damage during heavy rain two weeks ago (rising water from the ground), but was driving fine until today when it wouldn't turn on at all. As you can see from the picture, the seats are clean so the water level likely did not even go up to that level.

    Our long time trustworthy mechanic on the phone says that the car is likely not salvageable, which I find hard to believe given the extent of the damage.

    What self-diagnostics can I run in this case to determine that the car is indeed unsalvageable?

    Thank you!

    signal-2025-08-13-141554_002.jpeg signal-2025-08-13-141551_002.jpeg
     
  2. JC91006

    JC91006 Senior Member

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    Maybe the battery just died? Have you tried jump starting it? Does your headlights turn on brightly?
     
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  3. Tombukt2

    Tombukt2 Senior Member

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    Check 12V to be at least 12.5 V . What you mean dead no lights on dash at all ? Push button twice no brake all should lite up? Is the red security car flashing ?
     
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  4. Tombukt2

    Tombukt2 Senior Member

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    That car isn't very broke
     
  5. brka-brkb

    brka-brkb New Member

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    Zero light, not even the red triangle. (Sniff)
     
  6. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    In simple economic terms, the estimated cost of the repair closely approaches or even exceeds the value of the car.

    He might be wrong- but to read between the lines, he's telling you he doesn't want to do this work. Find another mechanic.

    I've known some trustworthy mechanics who helped to maintain their reputational status by turning down repairs with low success rates, high "comeback" rates or just required a lot of hours billed for minimal customer satisfaction.
     
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  7. bisco

    bisco cookie crumbler

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    chasing electrical problems in a prius from flooding can anger customers who don't understand the nature of the beast.

    if you want to go down the rabbit hole, get an old windows laptop, get a copy of tech stream up and running, and start the trouble shooting process by scanning the codes.
    then rent the service manual by the day, and start following the trouble shooting tree.
    all the best!
     
  8. brka-brkb

    brka-brkb New Member

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    Thanks all for your responses -- I guess what I'm really asking is, per the subject line, can the car die like this from water getting into the car at the carpet level, given that both car batteries are well above the foot/carpet level and stayed dry (presumably)?
     
  9. PriusCamper

    PriusCamper Senior Member

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    Until you can clearly articulate the actual water level the car was exposed to both us and our mechanic have zero ability to tell you how damaged it is. The water level could be accurately indicated by the flood marks on the wheels.

    In the meantime, I'm with Tombuk2 on this... Your pictures so zero indication of water anywhere and even if there were minor puddles inside the car the hyrbid equipment is higher up than that.

    I bet you haven't put a charge on your 12v battery in a long time and then you left the car doors open for a while when trying to dry it out and now your 12v battery is drained down.
     
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  10. ChapmanF

    ChapmanF Senior Member

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    I'd suggest, without delay, reading through T-SB-0229-12.

    It has a section 1 just about getting the vehicle safe. First, decide whether any water got over the rocker panels into the car. If not, great, go to section 2. Otherwise, even if you see no water but carpet's damp, open all doors/hatch/trunk, pop the rubber plugs at floor pan corners and spare tire well, disconnect 12V battery ground (be sure to fold cable well away from the terminal so it won't sproing back and make contact), pull traction battery service plug (but only after disconnecting 12V, and only after letting water drain from the area). Then use wheel dollies to get the car to a safe place away from other valuable stuff.

    Most of the rest of the TSB is section 2, with different lists of things to inspect depending on how high the water got (level 1, lower edge of rim; level 2, axle centerline; level 3, top of rocker panel/lower door edge; level 4, lower edge of dash panel; level 5, top edge of dash panel) and whether the car was driven in the water.

    Section 3 is then about repairs.
     
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  11. bisco

    bisco cookie crumbler

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    sounds cheap enough
     
  12. rjparker

    rjparker Tu Humilde Sirviente

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    Yes.

    Connectors can get wet and dirty (flood water is filthy) and corrode over a period of time. Often flood cars seem to dry out and run but then begin to have difficult to find problems due to corrosion in places no one expects. Finding those problems is not easy for even a "trustworthy" mechanic. A scanner will not pinpoint those issues. It takes an experienced electrical auto tech with things like oscilloscopes and detailed wiring diagrams. Some issues can take many hours at $150 an hour. Maybe they get it running again only to find another problem two months later due to corrosion.

    A common scam is to buy these cars at auction, move them to another state to get a clean title and sell them to an unsuspecting buyer.

    With that said, you have not answered the most basic no start questions posted above in #2 and #3.

    Measuring the 12v followed by a polarity checking jump box attempt would be my first move.
     
    #12 rjparker, Aug 17, 2025 at 9:30 AM
    Last edited: Aug 17, 2025 at 10:55 AM
  13. ChapmanF

    ChapmanF Senior Member

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    Don't forget that, using the scheme of the TSB linked in #10, the car is presumed unsafe at least until the early things to check and inspect in the TSB have been addressed; it should be stored with 12-volt and high-volt systems disconnected, outdoors and away from stuff you'd rather not burn.
     
  14. brka-brkb

    brka-brkb New Member

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    Sorry for my late response as I was traveling and just returned home yesterday -- thank you all very much for your very helpful responses!

    GOOD NEWS: I went to Costco this morning and got a new Interstate 12V AGM battery (CCA 410), and the car turned on and drove fine!

    BAD NEWS: I measured the new battery after driving the car about 30 miles on highway, and battery life (SOH) is showing only 6.6% (State of Charge is 100%), which is concerning given that the new battery SOH was 99.7% before I installed the battery and test drove the car.

    Hopefully the new battery will not have died again when I take another reading tomorrow morning (about 15 hours from now).

    Could a parasitic drain be causing such a rapid drop in the SOH number, in just 3 hours since the installation of the new battery?

    For reference, I've attached the before and after readings of the battery, as well as the battery specification.

    Thank you for your continued words of advice and wisdom!
     

    Attached Files:

  15. rjparker

    rjparker Tu Humilde Sirviente

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    It is unlikely a new Costco battery has suddenly gone bad but it is possible, maybe a 1% or less chance.

    A battery load tester imposes a high load on the battery and monitors the voltage and sometimes the current to determine the battery capacity. A bad connection can add resistance and create a false result. The cheap instantaneous load testers don't have a large power resistor to properly simulate a large load so they pulse a resistor and extrapolate. Often leading to errors. So I would return to the seller or other auto supply and verify the capacity is still there.

    With that said, your first battery may have failed due to an excessive parasitic draw caused by corroded wiring or connectors. I would check the parasitic draw which should be less than 30 ma after 10 minutes.
     
  16. brka-brkb

    brka-brkb New Member

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    (rjparker, thank you for your latest response.)

    UPDATE: On a whim I decided to test the battery again, about 2.5 hrs after my previous test that showed poor SOH, and now both SOH and SOC are 100%, which is a relief. Please see the attached photo.

    I did not drive the car between the two tests (I don't know if this is would be a factor), so what could be causing this discrepancy?

    I will report back here tomorrow morning after another test. Thank you all!
     

    Attached Files:

  17. PriusCamper

    PriusCamper Senior Member

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    That information clearly states that it is for a vehicle that was submerged under water. OP's photos indicate that the car was never submerged under water. Even the carpet looks dry and there's zero evidence of being submerged. And OP has yet to clarify how high the water got or if the carpet on the floor of the vehicle, was damp. They also won't indicate how high the water level got. Meanwhile the mechanic on the phone who hasn't seen the car, as well as everyone else in this thread is giving advice for a vehicle that was submerged under water even though OP has never indicated in enough detail that its what they are dealing with.
     
  18. brka-brkb

    brka-brkb New Member

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    Hi there, thanks for posting. The water likely did not go much above the floor level, as carpet was the only thing that was wet in the car. Phew!
     
  19. PriusCamper

    PriusCamper Senior Member

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    Thanks for clarifying... That's the type of water exposure these cars are designed to handle without issue. It's equivalent to driving through a puddle. If you had standing water inside your vehicle that would be when things are designed to handle that.

    Also make sure to check your spare tire wheel well as that can hold enough water to cause damage if its sloshing around for a long time. If it is filled with water there's a rubber plug at the bottom that you can pull with needle-nose pliers to drain it.
     
  20. Brian1954

    Brian1954 Senior Member

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    It appears that a bad connection was the cause of the "after" battery test, giving a bad result. Look at the resistance that was measured.
     
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