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New issue.

Discussion in '5th Gen 4Runners (2010-2024)' started by raaron22, Jul 15, 2025 at 3:35 PM.

  1. Jul 15, 2025 at 3:35 PM
    #1
    raaron22

    #1
    raaron22 [OP] New Member

    Joined:
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    Gender:
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    First Name:
    Robert
    Vehicle:
    16’ 4runner
    Gobi roof rack, 3in lift
    2016 4 runner 210,000 no previous issues. Was driving home today, 4LO started flashing, temperature gauge went to “C”, and traction control light came on. I shut the vehicle off, tried to restart. It turns over just fine, but it won’t start. The security light flashes on as well. I unhooked the battery for awhile, and still nothing. Had a friend come hook it up to the computer and the error message was ECM lost connection or something like that. Any suggestions?? Thanks in advance.
     
    raaron22, Jul 15, 2025 at 3:35 PM
    #1
  2. Jul 15, 2025 at 3:41 PM
    #2
    2Toys

    #2
    2Toys Imperial Star Cruiser

    Joined:
    Jul 6, 2020
    Member:
    #15337
    Messages:
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    Gordon
    NorCal
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    2019 4Runner TRDORP
    It won't start because the immobilizer light is on - security light flashes because the key is no longer recognized. Hope you have a spare key - try that first and see what you get.

    Oh, and welcome to the forum!
     
    2Toys, Jul 15, 2025 at 3:41 PM
    #2
    raaron22[OP] likes this.
  3. Jul 15, 2025 at 4:03 PM
    #3
    raaron22

    #3
    raaron22 [OP] New Member

    Joined:
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    Member:
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    Messages:
    2
    Gender:
    Male
    First Name:
    Robert
    Vehicle:
    16’ 4runner
    Gobi roof rack, 3in lift
    No other keys.
     
    raaron22, Jul 15, 2025 at 4:03 PM
    #3
  4. Jul 15, 2025 at 4:04 PM
    #4
    BS67

    #4
    BS67 8404 USMC Doc

    Joined:
    Jan 26, 2024
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    CC Ne
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    Welcome
     
    BS67, Jul 15, 2025 at 4:04 PM
    #4
  5. Jul 15, 2025 at 4:38 PM
    #5
    JET4

    #5
    JET4 Old Member

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    Southeast, Va.
    welcome
     
    JET4, Jul 15, 2025 at 4:38 PM
    #5
  6. Jul 15, 2025 at 5:26 PM
    #6
    balong48

    #6
    balong48 New Member

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    Indiana
    Vehicle:
    2011 Silver 4Runner Limited
    Neutral safety switch? 4LO flashing is apparently one of the signs. I can’t speak to the other symptoms you had though.
     
    balong48, Jul 15, 2025 at 5:26 PM
    #6
  7. Jul 15, 2025 at 5:27 PM
    #7
    steelevo

    #7
    steelevo Not so new anymore...

    Joined:
    Nov 29, 2022
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    #29845
    Messages:
    2,817
    Utah
    Vehicle:
    2023 4Runner TRD Pro Solar Octane
    Welcome
     
    steelevo, Jul 15, 2025 at 5:27 PM
    #7
  8. Jul 15, 2025 at 5:47 PM
    #8
    whippersnapper02

    #8
    whippersnapper02 New Member

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    2019 TRDP w/Kangs brah!
    I’d start simple like check all fuses.
     
    whippersnapper02, Jul 15, 2025 at 5:47 PM
    #8
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