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Trailer Brake Disconnect Error

Discussion in '3rd Gen Tundras (2014+)' started by DaveCar81, Jan 10, 2019.

  1. Jan 10, 2019 at 8:05 AM
    #1
    DaveCar81

    DaveCar81 [OP] New Member

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    Rough Country leveling kit, 20% tint
    Hey guys, new here. I have an '18 Tundra TRD. When I hitch up to my RV, it says "trailer disconnected" and the trailer brakes wont engage. I have taken it back to Toyo and they have replaced the brake controller module, no fix. They even tried to connect my RV to another new Tundra on the lot, same issue. Took the RV back to the dealer, all connections were tested and passed. They only time I notice that the trailer light comes on my dash and actually works the trailer brakes is when I am sitting still at a light or parked. Has anyone run into this issue or know what the fix for this is? I hate towing and not having trailer brakes. Thanks in advance!
     
    Biguntrd likes this.
  2. Jan 10, 2019 at 9:22 AM
    #2
    HTGreen

    HTGreen New Member

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    Long identified issue, do a search for all the threads. Toyota does not have a fix.
     
    Biguntrd likes this.
  3. Jan 10, 2019 at 9:25 AM
    #3
    Adriver71x

    Adriver71x New Member

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    Common problem with the OEM brake controller. Up grade to a P3 brake controller and plug and play wire harness. E-trailer is the cheapest and ESP sells a replacement replacement panel so you don't have to drill holes. Here is a picture of the set up.20181201_141752.jpg
     
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  4. Jan 10, 2019 at 10:22 AM
    #4
    HTGreen

    HTGreen New Member

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    Don't believe plug-n-play available for 2018, unless they just released one.
     
    jtwags likes this.
  5. Jan 10, 2019 at 10:31 AM
    #5
    jtwags

    jtwags It's Crackled Bacon

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    I am waiting for 2018 plug and play harness too for P3. Havent seen one yet.
     
  6. Jan 10, 2019 at 10:53 AM
    #6
    Adriver71x

    Adriver71x New Member

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    I just tried to get on there website to check for you people but the website is down
     
  7. Jan 10, 2019 at 11:54 AM
    #7
    woodywoodward

    woodywoodward New Member

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    This is from Tekonsha

    Thank you for contacting Tech Support. I have attached a technical tip on hardwiring a brake control into a 2018 Tundra. Neither Toyota or Tekonsha will be making a plug in brake control harness for the 2018 tundra. The reason why, is that Toyota did something different with their connector, and we cannot get a brake light signal thru the harness. If I can be anymore help, please let me know.

    Danny Dunn
    Technical Service
    Horizon Global
    (888) 785-5832

    It will have to be hardwired.
     

    Attached Files:

  8. Feb 2, 2019 at 6:32 AM
    #8
    DaveCar81

    DaveCar81 [OP] New Member

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    @Adriver71x I already have a Tekonsha brake controller from when I had my Tacoma with harness. Where would I be able to connect the brake controller to my Tundra and bypass the integrated controller? Thanks in advance!
     
  9. Feb 2, 2019 at 8:01 AM
    #9
    Adriver71x

    Adriver71x New Member

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    I found out they don't make a plug and play wire harness for 2018. Woody Woodwood posted some info on this. Sorry I can't help you.
     
  10. Feb 6, 2019 at 11:38 AM
    #10
    BWinter

    BWinter New Member

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    On a previous thread about the same issue a member described a fix. He installed turn signal load resisters to the trailer brake output wires. The additional load current using these resisters allowed the Tundra to "see" the trailer brakes and remain connected.

    He seemed satisfied with the fix.
     
  11. Feb 6, 2019 at 11:50 AM
    #11
    TundraPro2019

    TundraPro2019 New Member

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    That sounds interesting. Do you have a link by any chance to that thread?

    Thanks!!
     
  12. Feb 7, 2019 at 7:30 AM
    #12
    pop's

    pop's 1794

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    WHY WHY Would anyone mess with what works in 2017 and in 2018 :crapstorm: I'll tell ya why engineers or cost cutters that would be my guess. :boink:
     
  13. Feb 13, 2019 at 11:10 AM
    #13
    BWinter

    BWinter New Member

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    Last edited: Feb 19, 2019
  14. Feb 13, 2019 at 1:54 PM
    #14
    sbxx312

    sbxx312 New Member

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  15. Feb 19, 2019 at 3:18 PM
    #15
    BWinter

    BWinter New Member

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    Sorry link to thread did not load. I corrected and added the link in post number 13.
     
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  16. Feb 20, 2019 at 5:53 PM
    #16
    TundraPro2019

    TundraPro2019 New Member

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    Thanks for correcting the link!
     
  17. Feb 20, 2019 at 6:21 PM
    #17
    TundraTSS19

    TundraTSS19 New Member

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    Auxbeam NF-S1 H4 led headlights Auxbeam NF-S1 H11 led fog lights Reese Towpower brake controller LED step bar light strips
    I installed an aftermarket controller only 2019 Tundra 4.6L and it wasn't difficult at all. I used a tekonsha harness to make it easier even though you'll have to take the white plug housing apart bto separate the wires for I stlwlation but it's only 4 wires.

    20190107_210726.jpg
    20190107_210737.jpg
     
  18. Apr 18, 2019 at 12:16 PM
    #18
    Brybates

    Brybates New Member

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    Hey all. Toyota has issued a safety bulletin for this issued April 5. The issue is with the truck software. They uploaded an update and the issue is gone. Brake controller has a lot more power as well. It takes a few minutes. Don’t waste money on any other options posted.
     
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  19. Apr 18, 2019 at 12:19 PM
    #19
    Electron_si

    Electron_si New Member

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    That’s really good to hear that Toyota has fixed this issue. Thanks for the heads up. Is there a safety bulletin number or anything associated with it?
     
  20. Apr 18, 2019 at 1:27 PM
    #20
    Brybates

    Brybates New Member

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    The tech did have a numbered bulletin sheet with him. I will look into getting the number from the service department at country hills Toyota in Calgary.
     
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  21. Apr 23, 2019 at 7:36 PM
    #21
    TOYgolfer

    TOYgolfer New Member

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    My 2018 Tundra had the same problem with the trailer disconnect warning. Took it to the dealer and told them about the TSB that was out there to fix the problem. They found the TSB and updated my ECU and the problem went away. This was the Toyota dealer in Albuquerque, NM. The TSB is out there. I believe it is TSB-0036-19.​
     
  22. Apr 23, 2019 at 8:13 PM
    #22
    Greg Marmalard

    Greg Marmalard New Member

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    Here'a my service order from a couple weeks ago.

    Worked on my '19!

    TSB 0036-19


    tsb.jpg
     
  23. Apr 27, 2019 at 10:23 AM
    #23
    riversiderv

    riversiderv New Member

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    I bought a new camper 150 miles from my home and picked it up last Saturday. The "Trailer Disconnect" warning came on and off the whole way back home in my 2018 Crew Max. After finding this thread on here I was not feeling good about my local dealer being able to fix it. But I took it in Thursday and they ran the update on the truck and I just took the camper out for a test drive and all is well. T-SB-0036-19 fixed the problem. Toyota of Kingsport is where I took it in for the fix.
     
  24. Apr 27, 2019 at 10:47 AM
    #24
    TacoWuzzaTurd

    TacoWuzzaTurd Loving my Tundra

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    Weird I went to my dealer about a week ago and gave them this TSB 0036-19. At first they couldnt find it. After an hour or so the Service Advisor called me back and said their tech found a fix, didnt say what the TSB was but she said it was not under my specific truck when they searched for it. The stranger part is they said they couldn't fix it because they needed to order the parts which are back ordered. So I have no idea what the issue is that they think they found nor do I know what/if any TSB # they're operating under since it appears in this thread it has nothing to do with hardware and is a software update which needs to be done. They ordered me a new trailer brake controller relay with bracket I believe is what I saw on the service advisor notes. :confused:o_O:notsure::notsure:
     

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