1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

2018 Tundra TRD Trailer not connected warning

Discussion in 'Towing & Hauling' started by Brew1018, May 2, 2018.

  1. May 2, 2018 at 7:14 PM
    #1
    Brew1018

    Brew1018 [OP] New Member

    Joined:
    May 2, 2018
    Member:
    #14984
    Messages:
    9
    Gender:
    Male
    First Name:
    Rich
    Vehicle:
    2018 Tundra TRD
    hi all - I’m a brand new Tundra owner and I am very happy I found this forum! We bought a new 2018 TRD off-road specifically to tow our 4000 pound 2017 travel trailer. The first time we hooked up the trailer everything seemed fine m...UNTIL we started moving. Then the Tundra gives a warning - “trailer disconnected”. When that happens the system seems to reset and the brakes do not work. The lights, brake lights and blinkers all continue to function even though the Tundra says trailer disconnected. As soon as I stop the trailer comes back “online” and the brakes work. I can roll forward and it stays connected but as soon as I give it gas it gives the same warning. The trailer is very new as well. The dealer has the truck and says everything seems fine but they are going to try and hook up a different trailer to see if they can replicate the issue. Has this happened to anyone? I love the truck, maybe I should have get a P3 or other non factory trailer brake? Thank you for any feedback.
     
    JJGarcia8 likes this.
  2. May 2, 2018 at 8:55 PM
    #2
    ColoradoTJ

    ColoradoTJ My balls was hot Staff Member

    Joined:
    Feb 24, 2016
    Member:
    #2766
    Messages:
    14,370
    Gender:
    Male
    First Name:
    Chris
    Colorado
    Welcome to the site Rich!

    This can be an issue, not vehicle brand specific and happened on my GMC and it was totally pissing me off. Truck tested good, trailer tested good at several different places, but when the truck moved it would give me a trailer connection warning like yours.

    I was about to start replacing the 7 prong plug and then off to the wiring. My camper was fine and never had an issue, so I figured it was the flatbed trailer. So before I went full retard on this issue, I figured it was a connection issue. This is how it was resolved:

    -Take a small screw driver and bend the prongs inward a little so the connection is solid.
    -Ensure all tabs are clear of corrosion.

    My issue was just that simple. Let us know if this works for you.
     
    4x4_Angel and Brew1018 [OP] like this.
  3. May 2, 2018 at 8:56 PM
    #3
    nishibot

    nishibot Just2havnfun

    Joined:
    Aug 20, 2017
    Member:
    #9170
    Messages:
    547
    Gender:
    Male
    First Name:
    Steve
    Perris, CA.
    Vehicle:
    2017 Tundra CM 4x4 TRD Off Road MGM
    20171123_085126.jpg
    I had a similar problem. Bought a P3. 20180114_160425.jpg
    Finally had the dealer drive with truck and trailer. They found a bad magnet on one of the wheels. Only failed when it got hot. Dealer said they would not have found the problem if not for the P3.
     
    4x4_Angel and Watt maker like this.
  4. May 3, 2018 at 3:16 AM
    #4
    Brew1018

    Brew1018 [OP] New Member

    Joined:
    May 2, 2018
    Member:
    #14984
    Messages:
    9
    Gender:
    Male
    First Name:
    Rich
    Vehicle:
    2018 Tundra TRD
    Thanks guys! Very helpful. I’m going to try the prongs first and if that doesn’t work, I might see a p3 in my future! I truly appreciate it!
     
  5. May 15, 2018 at 10:56 AM
    #5
    Pwoodard81

    Pwoodard81 New Member

    Joined:
    May 11, 2018
    Member:
    #15243
    Messages:
    3
    Gender:
    Male
    Were you able to get your issue resolved? We are experiencing the same problem with our 2018 Tundra and brand new travel trailer. The dealership has both our truck and trailer now.
     
    4x4_Angel and Brew1018 [OP] like this.
  6. May 15, 2018 at 3:06 PM
    #6
    Brew1018

    Brew1018 [OP] New Member

    Joined:
    May 2, 2018
    Member:
    #14984
    Messages:
    9
    Gender:
    Male
    First Name:
    Rich
    Vehicle:
    2018 Tundra TRD
    Well, I wish I could say it was "resolved" without an issue.

    Toyota had my truck and trailer for a few days. They tested the truck, said it passed and all connections were good. Then they hooked up own their car trailer and it worked and it's the trailer and not the truck.

    So, I took the truck and trailer to an RV dealership and low and behold, the trailer checked out just fine there. They then took my truck and hooked it up to a 2018 trailer and the truck threw the same "Not connected" error and I was there. I really thought it was the truck all along. Lot's of software and technology, whereas the trailer is pretty basic, even though it's pretty new.

    Ultimately, I was in a pinch because I had a camping trip planned last weekend, and it was planned ages ago. So I ended up getting the Prodigy RF Brake controller. Not cheap, but funny enough it works just fine without any changes to the trailer. Hence it's the truck. I also got the RV dealer to document the issue and the test they did with a different trailer.

    I have reached out to the dealer and they are going to " work" with Toyota on resolving my issue. Which in my opinion, is getting me my money back to cover the Prodigy. The Prodigy works great and has brake boost which ultimately is probably better than the Toyota brake. Another nice feature of the prodigy, it plugs into your cigarette lighter, so there is no damage to my dashboard.

    Good luck! Please let me know what you hear. Once / if I get anywhere with Toyota I will update this thread!
     
    Last edited: May 15, 2018
    JJGarcia8, 4x4_Angel and ColoradoTJ like this.
  7. May 16, 2018 at 8:40 AM
    #7
    Watt maker

    Watt maker Keepin' the lights on!

    Joined:
    Jul 4, 2017
    Member:
    #8415
    Messages:
    2,972
    Gender:
    Male
    First Name:
    Ronald
    Vehicle:
    2017 TRD Pro Tundra DC Cement
    1 of 255
    Does it just mount using the cigarette lighter? Otherwise, I don’t see how a cigarette lighter could provide enough amps for the brake controller.

    As for your problem, these new IBC’s are very sensitive when it comes to trailer brakes and wiring. I would also say that just because the travel trailer is new doesn’t mean the wiring is perfect either. I’ve fixed quite a few new trailers with bad wiring over the years. I would look specifically at the electric brake circuit and grounding circuits on your trailer, they need to be perfect. I would replace any and all “scotch-locks”, with solder and heat shrink. For the grounds, ground to bare metal frame, the ground from the 7-way plug must also ground here, then you can spray a little paint over the grounding point.

    Honestly, the aftermarket brake controllers are probably better. Hopefully you can get reimbursed.
     
    4x4_Angel likes this.
  8. May 17, 2018 at 5:48 PM
    #8
    Pwoodard81

    Pwoodard81 New Member

    Joined:
    May 11, 2018
    Member:
    #15243
    Messages:
    3
    Gender:
    Male

    Did you get a plug and play wiring adapter for your prodigy? If so, which one? I've ordered the 3017-P, but am having doubts if it will fit
     
    Stroke250 likes this.
  9. May 18, 2018 at 12:58 PM
    #9
    jdavis75

    jdavis75 New Member

    Joined:
    May 18, 2018
    Member:
    #15431
    Messages:
    28
    Gender:
    Male
    First Name:
    Jason
    Vehicle:
    18 tundra crewmax SR5 4x4
    Elevated suspension shackle mounts and shackles
    Sitting at my dealership with the same problems.
     
  10. May 19, 2018 at 5:17 AM
    #10
    varlay

    varlay New Member

    Joined:
    May 19, 2018
    Member:
    #15445
    Messages:
    1
    Gender:
    Male
    First Name:
    raul
    Vehicle:
    2018 tundra sr5 with offroad package
    Bought a 2018 Tundra about 2 months ago. It has the towing package and I got the exact same problem. I took it to the dealer's service department and they tested it with a trailer simulator that plugs to the bumper connector and drove around and of course everything checked out okay. But the only question the dealer could not answer was: How does the breaking system know there is a trailer connected/disconnected? There is nothing on the connections (electrical or hitch connections) that shows any additional sensing system attached. I checked everything on two different trailers: grounds, 2 new 7-blade plugs, bulbs, wiring connections and used a separated battery to check each circuit. On the truck, I unplugged and inspected the 7-blade connection for corrosion and visually inspected the wiring bundle (I lowered the spare tire). And everything checked okay. I test drove with one of the trailers and tried all the different trailer configurations and the Tundra continue having the same problem. I noticed that some times it connected and disconnected, I was able to temporarily re-establish connection by actuating the manual control. I also noticed that the gain button was not changing the values correctly. The gain button was intermittent and I had to keep pressing it to be able to change the values up (plus). For the brake controller to work correctly, you have to set the gain value first (I set it at its max (10) value) then I was able to lock the wheels using the manual mode. But at the end, it continued to disconnect for no reason. My guess, is that the problem is in the truck brake controller system. The trailers have very simple electrical circuits that consists of lights and magnets. The Tundra's brake controller system must be measuring the flow of electricity to sense there is a trailer hooked up and may not be sophisticated enough to function whenever there is a change on the trailer circuitry, and it is only programed to "disconnect" whenever there is a change. The problem for me is that the dealer uses a trailer simulator to verified that the system is working, so I have to prove that the problem is not the trailer. My next step is to go to a trailer dealer and probably pay them to let me hook up couple of new trailer and document the results.
     
    Brew1018 [OP] likes this.
  11. May 25, 2018 at 4:57 AM
    #11
    Brew1018

    Brew1018 [OP] New Member

    Joined:
    May 2, 2018
    Member:
    #14984
    Messages:
    9
    Gender:
    Male
    First Name:
    Rich
    Vehicle:
    2018 Tundra TRD
    Thanks so much. At least I know it’s not just me. The aftermarket controller is working really well and I’m continuing to press Toyota. If I make any progress I’ll let you know. Thanks everyone!
     
    Ike74 and ColoradoTJ like this.
  12. May 27, 2018 at 2:35 PM
    #12
    DvH297

    DvH297 New Member

    Joined:
    May 27, 2018
    Member:
    #15648
    Messages:
    9
    Gender:
    Male
    First Name:
    Derek
    Vehicle:
    2018 CrewMax SR5 TRD O/R 4x4
    Count me in as having exact same problem w/my 2018 TRD OffRoad 4x4 TBC. will take back to dealer and see what they offer.
    Btw, I have confirmed that trailer brake system is working fine - using my old Sequoia with a Tekonsha controller.
     
  13. May 27, 2018 at 9:31 PM
    #13
    JoeDenver

    JoeDenver New Member

    Joined:
    Feb 17, 2018
    Member:
    #12953
    Messages:
    72
    Gender:
    Male
    First Name:
    Joe
    Denver
    Vehicle:
    2018 Crewmax MGM
    Lomax Tonneau, Line-X Bedliner, Clear Mask, Chrome Tip Exhaust, Stubby Antenna
    Just finished a small trip and the Toyota trailer brake kept going off and on. Probably going to just use one I bought for another vehicle. Hopefully someone gets theirs fixed.
     
  14. May 29, 2018 at 4:01 PM
    #14
    Bappa

    Bappa New Member

    Joined:
    Mar 7, 2018
    Member:
    #13393
    Messages:
    196
    Gender:
    Male
    First Name:
    Bo
    Arizona
    Vehicle:
    2018 Tundra CrewMax
    Coil overs (3”) and 295 tires, ESP storage, grab bar; RCI skids; tinted windows; rear air bags
    I just hooked my trailer up and drove down the street and back. So far mine is working fine.
     
    r1-superstar likes this.
  15. May 30, 2018 at 1:32 PM
    #15
    woodywoodward

    woodywoodward New Member

    Joined:
    May 30, 2018
    Member:
    #15745
    Messages:
    15
    Gender:
    Male
    First Name:
    Josh
    Vehicle:
    2018 TRD OFF Road Tundra
    bone stock
    Hooked my 17' camper up this weekend and mine (2018 trd off road cm ) is doing it too. the service department doesn't believe its the truck. I towed that same trailer with my 16 Tacoma with 0 issues. Have you guys had any success? headed to the hills next week.
     
  16. May 30, 2018 at 10:27 PM
    #16
    reboothphotobooth

    reboothphotobooth New Member

    Joined:
    May 30, 2018
    Member:
    #15766
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2018 Tundra Ltd
    I have the same issue today. Brand new 2018 Tundra Limited hooked up my trailer as soon as I hit the gas I get a trailer disconnected message.

    I used the trailer last week in a Nissan titan without a problem so I am pretty sure it is the Tundra have a problem.
     
  17. May 31, 2018 at 2:16 PM
    #17
    reboothphotobooth

    reboothphotobooth New Member

    Joined:
    May 30, 2018
    Member:
    #15766
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2018 Tundra Ltd
    did the 3017-P work for your 2018 tundra?
     
  18. May 31, 2018 at 3:56 PM
    #18
    Over the LINE

    Over the LINE New Member

    Joined:
    May 1, 2016
    Member:
    #3273
    Messages:
    469
    Gender:
    Male
    New Orleans
    Vehicle:
    2016 Limited CM 4 x 4
    Toytec -Duratrac -Expedition One-Fab Fours
    I got the same warnings on my 2016 pulling a dog trailer with no trailer brakes. It was caused by a short somewhere in the aux electrical system of the trailer. I built a 7 pin jumper cable that eliminated everything but the lights and...no more problem. Same trailer on two other non-Toyota trucks with factory trailer brake systems, no problem. Small trailer electrical problems can cause error messages just like small sensor problems on your truck can cause wild error messages.
     
    Watt maker likes this.
  19. Jun 3, 2018 at 11:37 PM
    #19
    reboothphotobooth

    reboothphotobooth New Member

    Joined:
    May 30, 2018
    Member:
    #15766
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2018 Tundra Ltd
    Hi Over the LINE, can you explain more what you done? In your case which one has the problem the Tundra or the trailer? Does your truck have the built in brake controller as well?
     
  20. Jun 3, 2018 at 11:39 PM
    #20
    reboothphotobooth

    reboothphotobooth New Member

    Joined:
    May 30, 2018
    Member:
    #15766
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2018 Tundra Ltd
    Do you have an update? Was your issue resolve?
     
  21. Jun 4, 2018 at 5:11 AM
    #21
    Over the LINE

    Over the LINE New Member

    Joined:
    May 1, 2016
    Member:
    #3273
    Messages:
    469
    Gender:
    Male
    New Orleans
    Vehicle:
    2016 Limited CM 4 x 4
    Toytec -Duratrac -Expedition One-Fab Fours
    The problem was a short or wiring fault on the trailer side. The trailer does not have brakes. It caused my Tundra to throw the same or similar warning. I fixed the issue by making a short trailer jumper with a 7 pin male (on the truck side) and a female to accept the trailer side (what would normally plug into the truck). In between the two I only connected marker and brake/turn so the short in the aux electrical system was removed.

    The side note was, this trailer does not throw fault warnings with two non-Tundra trucks with factory trailer brake controllers.
     
  22. Jun 4, 2018 at 5:41 AM
    #22
    nodak67

    nodak67 New Member

    Joined:
    Sep 7, 2017
    Member:
    #9510
    Messages:
    322
    Gender:
    Male
    First Name:
    JR
    Vehicle:
    2018 Tundra Platinum BBP CM 4x4 5.7L
    if you have an IBC installed from the factory, do you still have the adapter plug under the dash to connect an aftermarket IBC like the P3?
     
  23. Jun 4, 2018 at 7:49 PM
    #23
    woodywoodward

    woodywoodward New Member

    Joined:
    May 30, 2018
    Member:
    #15745
    Messages:
    15
    Gender:
    Male
    First Name:
    Josh
    Vehicle:
    2018 TRD OFF Road Tundra
    bone stock
    E799DB7A-5ECC-415C-A3C0-4C6A9EDAE54B.jpg
    I think I found it under the kick panel the pins all line up.046F6086-7259-4D6D-A40C-2DC5524EB4C6.jpg
    I unhooked turned the key over and it shows the tire warning but no brake controller issue. If I unplug the ibc it tells me their is a fault
    7D9D3702-72C2-45E9-B09A-21EA13ECECA2.jpg
    Giving it a shot . Has this controller and harness from my 3rd gent tacoma.
    15C5A2BF-E29F-4FA8-8391-0587CC72758D.jpg
    Showing the esp console. (Irritated the factory system sucks!)4D37C1CD-57FD-4374-AF4D-3A2CDBEA3BF1.jpg
    Harness number 5A802035-09FF-47FA-8690-73A964149A08.jpg
    No trailer connected and tells me their is a fault.97DA441F-6F66-457A-AD11-EDCA9091A5AD.jpg
    Apply trailer brakes manually and it overrides.

    Any insight? This is an 18 cm limited.
     

    Attached Files:

    Stroke250 likes this.
  24. Jun 4, 2018 at 10:01 PM
    #24
    reboothphotobooth

    reboothphotobooth New Member

    Joined:
    May 30, 2018
    Member:
    #15766
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2018 Tundra Ltd
    Did you keep the IBC intact or you remove/disable it? I might just buy a Prodigy RF Brake controller as well.
     
  25. Jun 5, 2018 at 6:58 AM
    #25
    Watt maker

    Watt maker Keepin' the lights on!

    Joined:
    Jul 4, 2017
    Member:
    #8415
    Messages:
    2,972
    Gender:
    Male
    First Name:
    Ronald
    Vehicle:
    2017 TRD Pro Tundra DC Cement
    1 of 255
    I would test with a volt meter and make sure the pins on both plugs line up to what that circuit is supposed to be.
     
  26. Jun 7, 2018 at 10:16 PM
    #26
    woodywoodward

    woodywoodward New Member

    Joined:
    May 30, 2018
    Member:
    #15745
    Messages:
    15
    Gender:
    Male
    First Name:
    Josh
    Vehicle:
    2018 TRD OFF Road Tundra
    bone stock
    I have tracked the issue down to my trailer. My trailer is almost brand new (16') and never had an issue with it when my tacoma pulled it. One of the magnets is shorting out the system and resettingv (disconnect / reconnect after brake application) . I pulled my dad's new trailer today without a single issue. So I would imagine this is truly a trailer related issue and tundras are extremely sensitive to voltage changes. I would be interested in others feed back.
     
  27. Jun 11, 2018 at 2:32 PM
    #27
    Bear

    Bear Fargin' Iceholes

    Joined:
    Aug 24, 2016
    Member:
    #4301
    Messages:
    578
    Gender:
    Male
    Casco
    Vehicle:
    2016 Tundra TRD OffRoad
    PC 6" Stage II; Fuel Beast 18x9 +1mm...lights n stuff
    Grrrr. Getting the same problems with my '16. Have a BRAND new flat bed trailer with brakes...been working fine for weeks. Today, for no reason...no brakes. Lights work fine...7-pin is groovy.

    Just what I need--more trouble shooting before a big trip. Grrrrr
     
  28. Jun 11, 2018 at 4:35 PM
    #28
    Watt maker

    Watt maker Keepin' the lights on!

    Joined:
    Jul 4, 2017
    Member:
    #8415
    Messages:
    2,972
    Gender:
    Male
    First Name:
    Ronald
    Vehicle:
    2017 TRD Pro Tundra DC Cement
    1 of 255
    Just because a trailer is new, doesn’t mean all the wiring and brakes are 100%. Go over all the wiring and replace the scotch-locks with a good solder and heat shrink connection. Make sure the grounds are all good and go to the ground pin the 7-way connector.
     
    Toyotoholic likes this.
  29. Jun 12, 2018 at 11:40 AM
    #29
    Brew1018

    Brew1018 [OP] New Member

    Joined:
    May 2, 2018
    Member:
    #14984
    Messages:
    9
    Gender:
    Male
    First Name:
    Rich
    Vehicle:
    2018 Tundra TRD
    I never could resolve my trailer issue. Ended up with the Tekonsha 90250 RF brake controller and it worked just fine. Actually with the boost it was a better option!
     
  30. Jun 12, 2018 at 4:44 PM
    #30
    Bear

    Bear Fargin' Iceholes

    Joined:
    Aug 24, 2016
    Member:
    #4301
    Messages:
    578
    Gender:
    Male
    Casco
    Vehicle:
    2016 Tundra TRD OffRoad
    PC 6" Stage II; Fuel Beast 18x9 +1mm...lights n stuff
    Oh. That’s the next tasker. For a brand new trailer, the tires were barely nutted on. The axles themselves were hardly secure. I can only imagine the wiring...
     
    Smoofers and Watt maker like this.

Products Discussed in

To Top