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Trailer Brake Controller

Discussion in '2.5 Gen Tundras (2014-2021)' started by Conner2020, Aug 9, 2025 at 6:59 PM.

  1. Aug 9, 2025 at 6:59 PM
    #1
    Conner2020

    #1
    Conner2020 [OP] New Member

    Joined:
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    2020 Black Tundra SR5 4x4
    Lightbars, lift, custom wheels, larger tires.
    I have a feeling my trailer brake controller is no longer working. I used to be able to adjust things like gain before I connected and trailer and now that no longer works. I’m wondering if a fuse has been blown?
     
    Conner2020, Aug 9, 2025 at 6:59 PM
    #1
  2. Aug 9, 2025 at 7:48 PM
    #2
    Yota303

    #2
    Yota303 -Running on hope and gasoline-

    Joined:
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    2016 MGM Crewmax 4x4 Limited
    It might be time for a Tekonsha P3
    1st mod I did to my Tundra 5 years ago after buying a travel trailer. Night and day difference compared to factory controller, many members on here can testify to that.
    Here is everything you would need for plug and play.


    controller:
    https://www.amazon.com/your-orders/...es=&returnUnitMappingId=&shipmentId=Uh5sH5Kct

    mounting plate:
    [​IMG]
    $39 ESP Truck Accessories Brake Controller Mounting Plate for 2014-2019 Toyota Tundra, Black Steel Dashboard Mount
    $39 ESP Truck Accessories Brake Controller Mounting Plate for 2014-2019 Toyota Tundra, Black Steel Dashboard Mount
    https://www.amazon.com/gp/aw/d/B07HP9GH2W?ref=ppx_pop_mob_b_asin_title

    wiring harness adapter:
    [​IMG]
    $17 Tekonsha Trailer Brake Controller Harness, Compatible with Select Toyota Tacoma, Tundra
    https://

    upload_2025-8-9_19-59-7.jpg
     
    Last edited: Aug 9, 2025 at 9:23 PM
    Yota303, Aug 9, 2025 at 7:48 PM
    #2
  3. Aug 9, 2025 at 8:54 PM
    #3
    Yota303

    #3
    Yota303 -Running on hope and gasoline-

    Joined:
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    375
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    Washington
    Vehicle:
    2016 MGM Crewmax 4x4 Limited
    Last edited: Aug 9, 2025 at 9:34 PM
    Yota303, Aug 9, 2025 at 8:54 PM
    #3
  4. Aug 10, 2025 at 6:07 AM
    #4
    Conner2020

    #4
    Conner2020 [OP] New Member

    Joined:
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    Male
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    2020 Black Tundra SR5 4x4
    Lightbars, lift, custom wheels, larger tires.
    Yep I used that site too, I believe I found the fuse on my 2020 and it seems to be fine but I’ll go ahead and swap it to see if it makes a difference.
     
    Conner2020, Aug 10, 2025 at 6:07 AM
    #4
  5. Aug 10, 2025 at 6:08 AM
    #5
    Conner2020

    #5
    Conner2020 [OP] New Member

    Joined:
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    Messages:
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    Male
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    2020 Black Tundra SR5 4x4
    Lightbars, lift, custom wheels, larger tires.
    Ok I’ll look into this, I was hoping to stick with the stock one as I don’t tow very often but if it ends up needing to be replaced it is what it is.
     
    Conner2020, Aug 10, 2025 at 6:08 AM
    #5
  6. Aug 10, 2025 at 6:09 AM
    #6
    Conner2020

    #6
    Conner2020 [OP] New Member

    Joined:
    Oct 23, 2024
    Member:
    #124734
    Messages:
    19
    Gender:
    Male
    Vehicle:
    2020 Black Tundra SR5 4x4
    Lightbars, lift, custom wheels, larger tires.
    I do have a question though. When you guys do not have a trailer connected to the truck does the truck let you adjust the gain? That’s the only thing making me think it’s broken but I might just be crazy. I just always remember it working whether a trailer was connected or not.
     
    Conner2020, Aug 10, 2025 at 6:09 AM
    #6
  7. Aug 10, 2025 at 6:22 AM
    #7
    shawn474

    #7
    shawn474 Lego connoisseur

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    I am almost sure I have to have a trailer connected prior to adjusting anything on mine…..(2019 here)
     
    shawn474, Aug 10, 2025 at 6:22 AM
    #7
  8. Aug 10, 2025 at 6:38 AM
    #8
    Tunrod

    #8
    Tunrod New Member

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    Trans cooler, CatShield, TRD RSB, air bags, ScangaugeII, K02's, F/R Dashcam, Borla Exhaust
    Ya I think trailer needs to be connected. Also, my controller mysteriously dumped all settings once as I found out by driving and testing manual brakes and gain. Had to stop and re-enter everything.
     
    Tunrod, Aug 10, 2025 at 6:38 AM
    #8
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Products Discussed in

ESP Truck Accessories Brake Controller Mounting Plate for 2014-2019 Toyota Tundra, Black Steel Dashboard Mount
$38.95
Tekonsha Trailer Brake Controller Harness, Compatible with Select Toyota Tacoma, Tundra
$16.13
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