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Red triangle of death won't disappear after new 12V battery

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Ben Pidder, Sep 3, 2023.

  1. Ben Pidder

    Ben Pidder New Member

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    hi all,

    After 18 years of service the 12V battery of my 2005 Prius finally gave up. We replaced it with a new one (easy job).

    When the battery died, the red trinagle of death appeared, but now it will not disappear. The message on the screen says the problem is the automatic parking brake, but that does not seem to be the problem, the APB is working fine and that message also appeared when the battery was down.

    It could be that the new battery is not charged enough for the message to disappear, but that seems a bit strange after driving 30-60 mins for the past three days.

    Is there a way to reset the warning?
    thnks!
     
  2. JC91006

    JC91006 Senior Member

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    It's best you read the code that's stored, it'll give you a better idea of why that triangle is ON. It could be a different issue all together (like a failed inverter pump)
     
    m.wynn and Brian1954 like this.
  3. Ben Pidder

    Ben Pidder New Member

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    I am not able to do a code reading myself, but the triangle showed up at the exact moment of the 12V-battery failure. I have a several mentions linking the 12V-battery issues with the same error message regarding the automatic parking brake.
    An, as the car has been driving without issues for the past two weeks i do think the triangle of death's appearance was caused by the battery malfunctioning.

    However, how do I get rid of the triangle and the message on the touch-display ? The only advice on this I have found said it would disappear after several thousand of miles....
    It would be great if someone could point me to a quicker resolution!
     
  4. bisco

    bisco cookie crumbler

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    you might try to erase it with a code reader
     
  5. Ben Pidder

    Ben Pidder New Member

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    Thanks for your response. I did a code read (with dr Prius and Auto Doctor), but no error code came up. No pending, permanent or confirmed errors.

    Only at one point, dr Prius briefly gave a B2799 code. But this was gone quite quickly and did not return. Still, the red triangle of death remains with the automatic parking brake warning.

    Additionally the past days have seen some electric/electronic oddities: when i shut off the vehicle-system and pull out the keyfob, it sometimes happens that the car remains in On mode (not Ready, but when all electrical systems are active). This even after pulling out the keyfob. I have to shut off the systems several times before it really sticks. Also the clock quite often resets to 1:00 and air temp to 22 degrees celsius during shut off. I would not be surprised if a the keyfob is nearing its enddate, it is quite old and kept alive with duct-tape.

    I anybody has any ideas how to get rid of the red warning triangle or the cause or the electronic malfunction please let me know!
     
  6. sam spade 2

    sam spade 2 Senior Member

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    Have you fully charged (and tested) your new battery yet with a manual charger ?
    IF not, WHY not ??

    Then what is this "automatic parking brake" you refer to ?
    Is there not also a manual parking brake .....AKA emergency brake ?

    On some models, the "general alarm" comes on if the emergency brake mechanism is
    off-normal.
     
  7. Ben Pidder

    Ben Pidder New Member

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    thanks for your suggestions.
    There seems to be a difference between the US and EU models regarding the parking brake. Here we have a manual parking/emergency brake, operated by foot. And there is an automatic parking brake that is applied when the car is put into P. We do not have a button for a parking brake.

    There is no issue with the emergency brake, it is working normally.

    I have read posts where a faulty 12V battery has led to the same automatic parking brake error message on the display. It seems to be a default message when electrics does not function fully as wanted, i.e. low voltage.

    As I have no manual charger and the car cannot be parked next to the house (i live downtown in an apartment), the new battery has not been charged manually yet. I agree that would be the logical next step. It wouldn't surprise me if the battery has been in storage for quite some time and does not load easily (or nog fully at all).
     
  8. sam spade 2

    sam spade 2 Senior Member

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    In the US, that mechanism is NOT called a "parking brake" because it is not really a brake at all.

    It really is a mechanical "pawl" of some kind that engages the drive train somewhere.

    I would be a bit surprised if was commonly called an "automatic parking brake" in your part of the world either.
     
  9. Ben Pidder

    Ben Pidder New Member

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    Below picture is similar to the warning message that is continuously visible in combinaton with the red triangle.
    Thus automatic (P) "transmission lock mechanism" would probably be the best way to refer to it.
    Probably needless to say that applying the parking brake does not solve any issue..

    [​IMG]
     
  10. sam spade 2

    sam spade 2 Senior Member

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    When this happens, setting the manual parking brake is VERY important, since the "P lock" mechanism probably
    is not engaged and that leaves NOTHING to prevent the car from rolling away except you manually setting
    the parking brake.

    Have you charged the battery yet ?

    You REALLY need a shop visit to test the P-lock mechanism and get the alarm reset.
     
  11. Ben Pidder

    Ben Pidder New Member

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    The strange thing is that the "P" lock mechanism does work normally and always has worked normally. The car does not move in P, even if its parked on a slope.

    What I read elsewhere is that a lower voltage can cause the warning: 2005 Prius- Battery went dead- Error reading "transmission lock mechanism abnormal" | PriusChat

    My guess at the moment is that the warning was caused when the old/original12V battery was drained and that the new battery I installed is not loading properly. When the electric system is active the battery is charged with 14V, but when the system is off the voltage is never above 12.0 volt, sometimes dropping below 12.

    I haven't been able to go by the shop. Apart from the warning and the issue with the key fob, everything seems to be working fine.

    Below the OBD2 reading via the Auto Doctor app, you see the 14V charging on the right hand scale (green line) and the battery voltage on the left hand scale (blue line). This is similar to the readings I get when using the Prius check via the display in Vehicle Signal Check Mode (second picture).

    battery-check.png signalcheckmode.jpg
     
  12. sam spade 2

    sam spade 2 Senior Member

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    This is proof positive that.......
    Either your new battery is BAD or.....
    It just needs to be charged up fully once.

    Please don't run off chasing ghosts until you get
    this basic power thing fixed.

    Note: Don't leave an OBD dongle plugged in all the time.
    It will draw down the battery as it is HOT all the time.
     
  13. mr_guy_mann

    mr_guy_mann Senior Member

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    I would suggest using a digital voltmeter to test voltage at the battery terminals and at the "jumpstart" point in the underhood fusebox. I have found that readings from the MFD or scantools can sometimes be 0.5V or more in error.

    If you want to be able to scan all systems on your Gen2, here's a thread that reviews several devices and apps.

    https://priuschat.com/index.php?posts/3290690

    Posted via the PriusChat mobile app.
     
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  14. Mendel Leisk

    Mendel Leisk Senior Member

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    First off, that's an outstanding run for a battery. I think post #2 by @JC91006 was spot-on. Wanting the issue to be related to the 12 volt battery may be short-sighted.
     
  15. Ben Pidder

    Ben Pidder New Member

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    Finally been able to bring the car to the Toyota workshop, they found the following current codes:
    • C2310: Transmission control -> 'open or short circuit in battery circuit'
    • C1241: ABS/VSC/TRC -> 'low battery positive voltage or abnormally high battery positive voltage'
    • C1256: ABS/VSC/TRC -> 'ACCumulator low pressure'
    and a historic code that might be relevant:
    • B2796: Immobiliser -> 'No communication in immobiliser system'
    additionally, dr Prius finds a B2799 code once in a while -> 'miscommunication between the Engine Immobilizer and the Hybrid Vehicle Control ECU'.

    Apart from the red triangle and warning described above, some strange issues occur regularly these days:
    1. after shutting down the car and retrieving the key from the system, the car starts up again without the key in the sockety. It is in the ig-off mode then. This only happens once, after pushing down the start/shut button another time it does not happen again.
      • could this be caused by a faulty key?
    2. sometimes when the car is not on, all electricity drops, the car does not respond to the key or gives an indication the door is open or anything else. The 12V battery still measures 12.5V, but there is no current in the fusebox. Electricity restores after a couple of minutes without anything happening
    3. electricity does not drop during driving, however, each trip, at least once a warning beep sounds without any indicator light on the dashboard coming on.
    Given the codes I am still thinking of some 12V circuitry problem, the are beneath the battery is heavily rusted and has a big hole. As the negative pole is connected near that area, could this cause some issues in the 12V current stability?

    Any of your thoughts are highly appreciated.
     
  16. Ben Pidder

    Ben Pidder New Member

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    Code C2310 lead to P Lock C2310 Fix Fixed Solved Solution | PriusChat which gave the solution: adding a jump wire between "the 7.5 amp "P Con" fuse and this plug next to the positive jump point in the engine bay fuse box. It's the blue wire that leads from the P Con fuse to pin 13 on the Transmission Control Computer." See the video in mentioned post.

    The red triangle and P lock warning message disappeared. For now no drop of electricity or unintended restart of the car. Will keep posted if these happen again.

    Thanks for all your help!

    video of solution by strawbrad | PriusChat
    https://inv.vern.cc/embed/r2VOAyOvlxo
     
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  17. Ben Pidder

    Ben Pidder New Member

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    Unfortunately, not all problems are gone....
    The car still loses all electricity at times (luckily not yet while driving, only when it is not yet on). Key fob doesn't work, open doors and doorlights do not work. Clock goes back to 1:00 and temperature to 22 degrees celsius....

    Any clues where to look? Could it be in the immobiliser system, an issue with the anti-theft system or still another problem in the 12V circuitry?
     
  18. JohnPrius3005

    JohnPrius3005 Active Member

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    Hi Ben,
    Get the following, all cheap and available via Amazon, at least in the US:
    techstream knock off - mini VCI cable on eBay
    a cheap windows 10 laptop to use techstream - Amazon
    a 12 volt charger - Foxsur - Amazon

    Take your 12 v bat out of the car. If you can get your hands on one hook up a spare, regular 12 v car battery to the car so you can open the "trunk", otherwise park in a secure place and keep the trunk open with a doubled up rag over the latch
    Charge the 12v bat for at least 12 - 24 hours

    Reconnect the 12v bat

    Next time any warnings appear read them with techstream
    Fix the problems indicated

    Get and install new 3v bats in your keyfob(s) - cheap on AliExpress or eBay or Amazon
     
  19. Ben Pidder

    Ben Pidder New Member

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    hi John,
    Thanks for your advice. I'll try to find a way to run techstream.

    The other recommendations I have already done, hooked up the 12V several times to a charger overnight and and replaced the batteries in the keyfob. Both did not make a difference with regards to the issues.

    I have only one keyfob and it has been breaking down where you press it, it is being held together by duct-tape, so I wouldn't be surprised by it causing some issue...
     
  20. JohnPrius3005

    JohnPrius3005 Active Member

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    You can get a new key fob case on Amazon and just transplant all the old guts including the glued in transponder chip. This won’t fix your problems but will eliminate it as a cause you suspect