Red triangle on, no check engine light, engine not charging hv battery, decelerating charges battery

Discussion in 'Gen 2 Prius Main Forum' started by John Bach1, Dec 21, 2021.

  1. John Bach1

    John Bach1 New Member

    Joined:
    Jan 15, 2021
    4
    0
    0
    Location:
    New Jersey
    Vehicle:
    2004 Prius
    Model:
    Base
    04 Prius Starts and drives normally. Lost communication symbol on screen. Red triangle appeared while driving.
     
    #1 John Bach1, Dec 21, 2021
  2. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
    5,134
    4,176
    0
    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Welcome to PriusChat!!

    Do you have any OBD2 codes (DTCs) that are worth posting?

    FYI : you're being moderated until you've posted 5 times.
     
    #2 SFO, Dec 21, 2021
  3. John Bach1

    John Bach1 New Member

    Joined:
    Jan 15, 2021
    4
    0
    0
    Location:
    New Jersey
    Vehicle:
    2004 Prius
    Model:
    Base
    OBD2 shows no stored or pending codes.
     
    #3 John Bach1, Dec 22, 2021
  4. nancytheprius

    nancytheprius Active Member

    Joined:
    Oct 25, 2020
    334
    138
    0
    Location:
    iowa
    Vehicle:
    2006 Prius
    Model:
    II
    What code reader did you use? probably need a better one or techstream
     
    #4 nancytheprius, Dec 22, 2021
  5. John Bach1

    John Bach1 New Member

    Joined:
    Jan 15, 2021
    4
    0
    0
    Location:
    New Jersey
    Vehicle:
    2004 Prius
    Model:
    Base
    Harbor Freight. I don't have a Techstream. I checked fuses but found none burned out. Restarted engine now and red triangle gone. Engine now charging hv battery normally. Car running perfectly again. Any guesses as to what it could have been?
     
    #5 John Bach1, Dec 22, 2021
  6. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
    5,134
    4,176
    0
    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Generally speaking, when the red triangle appears (or other warning lights) there will be OBD2 codes (DTCs) stored in the ECUs.

    Try taking the vehicle to all of the surrounding auto parts chain stores (autozone, oriellys, pepboys, aap) for a 'free code scan', each location (even within the same chain) may offer a different scanner, and if you're lucky, one may actually have a toyota hybrid compatible scanner.

    Once you have the OBD2 codes handy, post them here for additional guidance. When was the last time you checked the oil level?
     
    #6 SFO, Dec 22, 2021
  7. John Bach1

    John Bach1 New Member

    Joined:
    Jan 15, 2021
    4
    0
    0
    Location:
    New Jersey
    Vehicle:
    2004 Prius
    Model:
    Base
    Funny you asked about that. A few months ago the red triangle of death appeared. I checked the oil level and it was very low. I added oil and the triangle was gone. This time the other day the oil was a little low (but in the correct range) and I added some oil. The triangle appeared 2 days later so that the oil level wasn't the issue. Now that everything is normal (no triangle and engine charging the hv battery again) I'm assuming the problem has resolved itself. I did not clear the codes with my HF scanner since there were no stored or pending codes to clear.
     
    #7 John Bach1, Dec 22, 2021
(You must log in or sign up to post here.)
Loading...
Similar Threads - triangle check engine
  1. deegee

    Red Triangle, ABS, VSC, Check Engine, Will not go ready and does not show codes

    deegee, Jul 6, 2021, in forum: Gen 2 Prius Main Forum
    Replies:
    16
    Views:
    3,055
    ChapmanF
    Dec 11, 2021
  2. fach

    Cat theft, check engine, and red triangle

    fach, Mar 23, 2021, in forum: Gen 2 Prius Main Forum
    Replies:
    11
    Views:
    2,640
    PriusCamper
    Mar 25, 2021
  3. GetShrek'd

    Red /!\, VSC, Check Engine and (( ! )) Light on; A/C by rear passenger side seat won't turn off

    GetShrek'd, Sep 20, 2020, in forum: Gen 2 Prius Main Forum
    Replies:
    23
    Views:
    5,522
    Tombukt2
    Jan 5, 2023
  4. Dtb#1!

    Red triangle check engine and car with red explanation Mark on touch screen

    Dtb#1!, Oct 22, 2019, in forum: Gen 2 Prius Main Forum
    Replies:
    2
    Views:
    1,609
    MilkyWay
    Oct 23, 2019
  5. James1964

    05 Prius 245K miles, dorman refurbished hybrid (8k miles on it)Red Triangle, check engine light.

    James1964, May 11, 2019, in forum: Gen 2 Prius Main Forum
    Replies:
    11
    Views:
    2,128
    James1964
    May 11, 2019