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How To Fix A P1780 Code 2000 4Runner 3.4L V6 4X4 With Trans Shift Fault When Brights Are On?

Discussion in '3rd Gen 4Runners (1996-2002)' started by PvtStash, Jul 25, 2023.

  1. Jul 25, 2023 at 6:31 AM
    #1
    PvtStash

    #1
    PvtStash [OP] New Member

    Joined:
    Jul 25, 2023
    Member:
    #34343
    Messages:
    2
    First Name:
    Tom
    Vehicle:
    2000 4Runner 3.4L 4X4 (My Wife's Best Friend,)
    After Market Entertainment System
    How To Fix A P1780 Code 2000 4Runner 3.4L V6 4X4 With Trans Shift Fault When Brights Are On?
     
    PvtStash, Jul 25, 2023
    #1
  2. Jul 25, 2023 at 11:39 AM
    #2
    negusm

    #2
    negusm New Member

    Joined:
    Oct 22, 2019
    Member:
    #11745
    Messages:
    2,095
    Gender:
    Male
    Vehicle:
    2002 4Runner SR5 4WD
    Wut?

    Are you saying that code, P1780, comes on when you turn on your high beams?
     
    negusm, Jul 25, 2023
    #2
  3. Jul 25, 2023 at 1:16 PM
    #3
    RumHamRunner73

    #3
    RumHamRunner73 Dead on with a zero

    Joined:
    Nov 24, 2022
    Member:
    #29771
    Messages:
    2,777
    Gender:
    Male
    First Name:
    Philip
    Oakboro, N.C
    Vehicle:
    2022 4 Runner Limited. Blizzard Pearl
    Park/Neutral switch code?

    Have you gave a quick visual inspection to ensure everything is secure, Not cut or gnawed up?
     
    RumHamRunner73, Jul 25, 2023
    #3
  4. Jul 26, 2023 at 5:58 PM
    #4
    PvtStash

    #4
    PvtStash [OP] New Member

    Joined:
    Jul 25, 2023
    Member:
    #34343
    Messages:
    2
    First Name:
    Tom
    Vehicle:
    2000 4Runner 3.4L 4X4 (My Wife's Best Friend,)
    After Market Entertainment System
    Visual showed nothing
     
    PvtStash, Jul 26, 2023
    #4
  5. Jul 28, 2023 at 8:10 AM
    #5
    negusm

    #5
    negusm New Member

    Joined:
    Oct 22, 2019
    Member:
    #11745
    Messages:
    2,095
    Gender:
    Male
    Vehicle:
    2002 4Runner SR5 4WD
    "PvtStash" sent this as a DM:

    I'll just say that you have an electrical issue. You need to look at that area with a wiring schematic.
     
    negusm, Jul 28, 2023
    #5
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