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Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus

Item # 3040-P
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Accessories and Parts 3040-P - Wiring Adapter - Tekonsha
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Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your 's dash. 1-800-940-8924 to order Tekonsha accessories and parts part number 3040-P or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus. Accessories and Parts reviews from real customers.
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  • Reviews (1316)
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2008 Toyota Tundra - Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus

  • Trailer Brake Controller
  • Wiring Adapter
  • Plugs into Brake Controller
  • Tekonsha
  • Vehicle Specific

Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your 's dash.


  • Wiring adapter eases installation of your electric brake controller
  • Custom connector end plugs into the built-in port beneath the dash of your vehicle
  • Other end plugs into the back of your electric brake controller
    • Compatible time-delayed brake controllers: Draw-Tite Activator I (5100), Draw-Tite Activator II (5500), Draw-Tite Activator III (5520) and Tekonsha PowerTrac (39523)
    • Compatible proportional brake controllers: Tekonsha Prodigy (90185), Tekonsha P2 (90885), Tekonsha P3 (90195), Tekonsha Primus IQ (TK90160) and Tekonsha Voyager (39510)
  • Wiring length: 32"
  • Limited 1-year warranty

Installation of Tekonsha Brake Controller Adapter

This adapter plugs into the 5-pin connector on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal.

To install your electric brake controller you need to connect the wiring of the controller to your vehicle. Certain manufacturers offer pre-wired options, typically known as tow packages, wherein these wires are run for you from the dash to the trailer connector on the back of your vehicle. Often, a brake controller wiring harness is included with your tow package. This harness plugs into a port beneath your dash and connects to the four wires of the brake controller. If, however, you have a brake controller with a plug in place of the four loose wires, you can use the Tekonsha adapter.

This adapter requires no hardwiring. It is designed to plug directly into your electric brake controller for the simplest installation possible. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time and securely stow it away.

3040-P Tekonsha Brake Control Wiring Adapter with 2 Plugs

Installation Details 3040-P Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus - 3040-P

Average Customer Rating:  4.9 out of 5 stars   (1315 Customer Reviews)

Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash.

2008 Toyota Tundra

This makes trailer brake installation easy. It fits perfectly


The Tehonsha Plug-In wiring adapter #3040-P fit just like it is supposed to in the 2015 Lexus KX 570. Also etrailer staff was very active in keeping me updated on my order progress and arrival. Also when I had trouble finding the KX side of the adapter the etrailer helped by providing articles and pictures. I am very pleased with my encounter with etrailer.

The wiring adapter continues to work fine.
Dennis - 08/29/2022


It seems like only etrailer could get hold of this! You do have to find a place to ground it. On my Toyota, found a small hole by the parking brake that I could nut & bolt the ground wire to very easily and very much out of the way.
I use this with a Primus brake controller mounted right of Steering Wheel near R knee. I can easily tuck up the wire yoke under the panel hiding other wires and it stays out of the way until the next time I need to hook up the brake controller and tow.


2010 Toyota Sequoia Limited plugged into factory harness. Worked great

Toyota Tundra

It would be easy to have this part order and install on the Tundra. i went one step further and end up using the wiring in the box with P3 Trailer brake and had to splice the wiring to make longer extension in order to install the P3 in the empty slot between the lighter and 12v socket which make is more customized look and out of way. Would be cool if they offer longer version for someone who want to install it somewhere else behind the driver's spot zone.

Product been working great. I even kept the console part and move it newer Tundra truck that I brought and bigger camper. Work better than I expected. I did use the bracket that come with the controller and mounted it. So I wouldnt have to worry about it coming loose or being in so far in the console. It also allow me to use the manual brake easily.
gregory a - 08/09/2017

2014 Toyota Tundra

Purchased brake controller for my 2014 Tuna. excellent order/shipping/receiving time.Received everything I needed with order in a very timely fashion. Website made it very easy to find and decide on exactly what I wanted. Etrailer will be my first choice for finding the accessories I need in the future. Purchased Tekonsha P3 brake controller and is the best thing to a factory installed controller I have encountered.

WOW! Somebody that actually cares! This email was a real surprise. Yes I amstill using the controller and it works better than any I have ever owned. Idefinitely recommend I as well as to everyone interested.Thanks for caring about your customers!
Henr L - 12/28/2017


Pictures of the install. Approximately
a 20 min job. First picture my finger is pointing to the factory plug with the etrailer supplied harness plugged in. Note the harness did not specify that the white common with the ring terminal should be connected to ground. But then again that SHOULD be obvious. I will be towing this weekend so I will rate the product then. One minor gripe is that there is always power to the unit which is a battery drain (as evidenced with the key out of the ignition and the unit stayed on) Not sure as to the impact but the controller can always be unplugged or removed.
Sorry for the dirty floor mats in the photos.

Just a quick note, the controller has an automatic shut-off. After 15 minutes of the truck powering off and sitting still, the control powers down. As soon as it sees movement, it powers back on.
-- Etrailer Expert Patrick B - 01/30/2014
So you ran ground to negative side of battery? Or just on the frame interior somewhere?
-- comment by: Trevor - 06/29/2014


Avoid the etrailer made has been nothing but problems. The connector at the brake controller disconnects power if the cable is bumped. Pretty scary to loose trailer brakes when you are slowing in a hurry!

I tried several times to make the existing connector work and finally cut it off and wired the one that came with the tekenosha controller.

Save your money and just splice your own.

I will have our Customer Service team reach out to you. The harness does have a 1 year warranty.
-- Etrailer Expert Jenny N - 03/07/2022


Etrailer is great with their competent staff & instuctional videos.


Made 7000 mile trip last summer to northwest and back with no problems associated with trailer braking.

So far it works great! Will let you know more after a 2023 trip to Maine from Florida.
Samuel - 01/21/2023

Toyota Tacoma

Install is very easy once you locate the vehicle's brake controller plug. The plug in a Tacoma is extremely well hidden. It is high above the driver's side kick panel taped behind a plug wrapped in foam. I have attached a photo to help you locate it in a late model Tacoma. Once I found the plug, the install took less than 20 min. The controller works great.

Very well
Mark N - 06/05/2015

2008 Toyota Tacoma

We ordered a part for the 2008 Land Cruiser and was told that it's the same installation. IT IS NOT! The connection to the harness is not in the same location as Tacoma. After looking for more than an hour, I got smart and found some info on another website. Even the manufacture has the info wrong. So, if you have a 200 series Land Cruiser, your plug is located under the dash behind the switches for the mirror. You will need to take apart the lower dash panel and then push out the switch panel. There is no need to detach any switch, it all hangs out just fine. See photos for the location of the plug. Plug the adapter in from there you can follow the instructions.

Thanks for the awesome review. Good info and really helpful for Land Cruiser folks.
-- Etrailer Expert Patrick B - 09/10/2013


Would have given 5 stars if the wiring would have been long enough to be useful. Instead of plug and play, had to solder additional wiring.

2008 Toyota Tacoma

Well constructed. Made the job easy. Installed on left side of steering wheel. If installing on right, the cable may not have been long enough.

2013 Dodge Ram Pickup

Installed P3 this weekend in 2013 Tundra Crewmax with towing package and pre-wire. Extremely easy, even with the center console installation. Will let the photos tell the story. Did have to combine the P3 included harness with the additional OEM harness to gain the length I needed. Plug and play with the pre-wire. Hooked up to trailer and set boost levels for varying loads. Works great! Vast improvement over older model Tekonsha controller in my Ram 2500 Diesel. Pull a Kiefer BP horse trailer: about 3600 lbs empty, 7500 with 3 quarter horses and gear. Usually pull 6-8 times per year, with only 1-2 horses. Short distance and flat terrain. It took about an hour to install. Dad is a retired USAF/FAA radar technician with every tool known to man. He QC'd the job. Will try to write better review later.


Easy to install. Owners manual had location of factory plug and we installed the entire system in less than an hour. We used the removable bracket so the unit can be stored in the case that was included with the controller when not towing so it is completely out of the way of the drivers legs and knees. We are a collision repair shop and I would rate the ease of installation as relatively easy if you just use common sense and consider wiring location and controller location BEFORE drilling holes in the plastic lower dash cover. Also need to be mindful on the lower air bag that protects the drivers legs in a serious collision and the routing of the wires if you install it on the right side of the steering wheel. We used wire ties and a small plastic wire holder to place the wiring in a secure place that does not rub through the wire insulation or get snagged by the drivers feet. See the attached photos. All work was performed in slightly less than one hour.


I had some confusion about how to set the trailer brake, so I called Tekonsha,and was told how to set it up. After that I have had no problems with the unit. as far as I can tel, it works very well.
I have never towed anything that had trailer brakes, so when I bought my Coachman, I ordered the unit from you knowing I was facing a learning curve, but it has worked out well.
I tow a 2018 Coachman Clipper, weighing close to 3700 pounds. Just the right size for my wife and I. I use it for hunting, fishing, and wild mushroom collecting.


I bought a new trailer and wanted to go camping. I did not have a brake controller. I called around and to get a Prodigy P2 installed it would be a 2 hour drive to the dealership plus about $200 bucks for parts and another $115 for an hour of labor.

I found this website, got the prodigy P3 plus 2 day shipping and installed it with their super simple video in 15 minutes all for less than $200. I was very pleased to say the least.

I highly recommend them. Service was outstanding! Video instructions spot on and simple.


Fit right in. Had to open the eye on ground, was tad too small, but fit and worked with a nice abrasion shield on wires

2014 Toyota Tundra

I picked up the redarc brake controller and sumo bags. I installed both today. I have to say I'm excited to use both when I pick up my travel trailer. The Redarc is so clean! It might have taken me an hour to install but that was just bc I was deciding how I wanted to run it .

Sumo bags took an hour to out on! I cant tell you how great they work yet. But the install was a breeze.


Definitely worth buying the "factory plug-in adaptor cable." It's low cost insurance that wiring connections will not be an issue. Save yourself frustrating troubleshooting.

2010 Toyota Sequoia

Incredibly easy, plug and play. Took less than 10 minutes to install my brake controller from start to finish because of this adapter.

2004 Toyota Sequoia 4WD with tow package

2008 Toyota Tundra

No hassle hookup. etrailer was awesome, they shipped my P3 and this connector immediately and provided great tracking. They also followed up afterward. Excellent customer service!!! Real customer service is hard to find these days. Thanks etrailer!!!
I haven't towed my travel trailer yet but the controller is installed in my 2008 Tundra and looks great. Everything seems to be working as it should. I can't wait to try it out. Regards, Dale V.


Great service and great product. Easy to install and makes moving equipment on my trailer much better

2007 Toyota Sequoia

All good. Right part to connect Tekonsha Prodigy P3 to 2007 Toyota Sequoia.

Show More Reviews

See what our Experts say about this Tekonsha Accessories and Parts

  • Location Of Factory Brake Controller Port On 2007 Toyota Tundra SR5 w/ Tow Package
    The connector should be located underneath the dash to the left of the steering column. It may be taped to another wire and tucked up and out of the way. I have linked a video installation of brake controller being installed on a 2007 Toyota Tundra using the # 3040-P adapter.
    view full answer...
  • What is Needed to Install a Tekonsha Brake Controller # 90885-3040P in a 2009 Toyota Tacoma
    All you will need to install the Tekonsha Prodigy P2 Proportional Brake Controller # 90885 and the Toyota Adapter, # 3040-P. This is the adapter for plugging the brake controller in under the dash of your Tacoma. Once plugged in and installed you will need to set up the brake controller with your trailer. I have included instructions for the brake controller for you to review. I attached installation instructions and an installation video for you to check out as well.
    view full answer...
  • Installing Brake Controller Wiring Harness 3040-P on a 2006 Toyota Sequoia
    Since your 2006 Toyota Sequoia came with a factory tow package, you can plug in the wiring harness, # 3040-P into the port on the vehicle. It is located under the dash to the left of and above the the emergency brake. You will remove the panel that is there on the far left, and the connector will be tucked up behind some other harnesses. It will have a white connector. I have included a link to a video that shows the installation of this harness on a similar vehicle. Make sure to also...
    view full answer...
  • What is the Correct Brake Controller Wiring Harness for a Tekonsha P3 and 2012 Toyota Tundra
    The brake controller wiring harness for the P3 and your 2012 Toyota Tundra, # 3040-P, does include a separate ground wire that you will need to attach to a bare metal surface on the truck. The factory ground in the Tundra is not sufficient for the needs of the brake controller which is why this additional ground wire is needed. I have included a link to a video showing installation of this harness on a 2010 Tundra which will be similar to your 2012.
    view full answer...
  • ABS and Traction Control Light Stays on After Installing Brake Controller on 2009 Tacoma W/Tow Pkg
    My first suggestion would be to take your Tacoma back to where you had the controller installed. If you paid them to install the brake controller, I would expect that they should be responsible for correcting the problem for you. According to my contact at Tekonsha, there a few possible causes for what you have occurring. The most likely cause is that your emergency brake is partially engaged. Pull the release handle to make sure the emergency brake is fully disengaged. You might need...
    view full answer...
    Image 1 for
  • Location of the Electric Brake Control Harness on a 2012 Toyota Tacoma
    The electric brake control harness on your 2012 Toyota Tacoma will be located underneath the drivers side dash to the left of the steering column. It should be taped to another harness near the emergency brake pedal. It will be a 5-pin connector. I have attached a photo showing the location of this harness as well as the installation instructions for the Plug-In Adapter from Tekonsha, # 3040-P, for you to check out.
    view full answer...
    Image 1 for
  • Wiring Adapter Options for a Tekonsha Sentinel Brake Control for 2013 Tacoma with Towing package
    I do have a solution that will work for you, however, the Sentinel brake controller has been discontinued so we do not carry vehicle specific wiring adapters that will work directly with that brake controller. Instead, you could use the wiring adapter, # 3040-P, for the Prodigy brake controllers, cut off the black connector and splice the wires from the adapter to the wires from your Sentinel brake controller. As far as mounting the brake controller is concerned. The Sentinel must be...
    view full answer...
  • Brake Controller Plug In Location for a 2013 Toyota Tacoma
    It is possible that the brake controller plug on your 2013 Toyota Tacoma is located behind the driver side kick panel like you have indicated. You may be able to reach in and pull it up if you can reach just the wires from the connector. There is also the possibility that it is tucked up under the dash and you cannot see it easily. You would need to fish around under there with your hand and gently push, pull, or otherwise move aside other harnesses to locate it.
    view full answer...
  • What is the Correct Brake Controller Wiring Harness for a 2013 Toyota Tundra
    Yes, if you are using a Tekonsha brake controller then you will use wiring harness # 3040-P. I have included a link showing a typical installation for you. The extra ground wire must be attached to a bare metal surface to complete installation because the factory Toyota ground is not sufficient for the brake controllers needs. This is a plug and play type of harness. One end plugs into the controller, the other end into the factory connector. No splicing required for installation.
    view full answer...
  • Where is the Trailer Brake Controller Plug In On a 2007 Toyota Land Cruiser
    I have included a picture that shows the typical location of the factory connector on Toyota vehicles that use brake controller wiring harness # 3040-P. The factory connector should be located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal. However it is possible that it could also be behind the kick panel to the left of the emergency brake pedal. I have also heard that it can be more towards the center console hidden above...
    view full answer...
    Image 1 for
  • 2014 Toyota Tundra Ground Wire Location for Brake Controller Install
    If you check out the install video I attached you can see that when we installed a brake controller in a 2013 Toyota Tundra like yours we attached the ground to the parking brake bracket. Fast forward to the 1:20 mark of the video to see exactly where.
    view full answer...
  • 2006 Toyota 4Runner Brake Controller Install Port Location
    I attached a picture that shows which connector to use as well as an install video that shows the # 3040-P being used to install a brake controller in a similar 2004 4Runner.
    view full answer...
    Image 1 for
  • Where Does a Brake Controller Plug Into on a 2014 Toyotas Tundra
    On your 2014 Toyota Tundra the brake controller port should be located above and to the left of the emergency brake pedal. It is possible though that it is tucked up further or it could have fallen being the driver's side kick panel next to the emergency brake. I have included a picture and video that should help.
    view full answer...
    Image 1 for
  • Brake Controller Wiring Harness for a 2015 Toyota Tacoma
    The Tekonsha brake controller wiring harness for the 2015 Toyota Tacoma is # 3040-P. I have linked a video showing an installation using this harness. Please note that the extra white ground wire in the harness does need to be attached to a clean metal surface to create an adequate ground for the brake controller.
    view full answer...
  • Recommended Brake Controller Adapter For Tekonsha Voyager On 2003 Toyota 4Runner
    The harness you need for your Tekonsha Voyager brake controller to plug into the port under the dash to the left of the steering column of your 2003 4Runner is part # 3040-P. One end plugs into the back of brake controller and the other end simply plugs in to the vehicle port. Then attach the white ground to a clean metal surface and you are good to go.
    view full answer...
  • Is the Tekonsha Brake Controller Adapter 3040-P a fit for the 2014 Toyota Tacoma
    I checked with Tekonsha and they list the 3040-P as a fit for your 2014 Toyota Tacoma and they would be a more reliable source for fit information than another retailer site. This is a new fit so chances are they haven't carried the fit info over yet for the 2014's yet on that site. Keep looking in that bundle, it should be there as long as you have the factory 7-way at the rear of your vehicle. I attached an install video for you to check out on a similar Tacoma as yours to help you find it.
    view full answer...
  • Recommendation for Wiring Harness to Use Prodigy Brake Controller In 2014 Toyota 4 Runner
    One end of the Tekonsha Plug-In Wiring Adapter, # 3040-P, will plug into your vehicle's electric brake control harness which is located near the emergency brake pedal. The other end plugs directly into your Prodigy brake controller. I have attached an installation video which may be of help.
    view full answer...
  • How to Wire a Brake Controller to a 2003 Toyota Tundra
    Manufacturers aren't always completely consistent when using wiring colors. Some years there can be some variances. For example, it looks like the blue wire you found instead of the red wire is the brake output circuit and should be connected to the blue wire of your controller The black/red wire goes to the black wire of the controller The Green/white wire goes to the red wire of the controller The brown wire goes to the white of the controller The green wire would not be used.
    view full answer...
  • Brake Controller Plug In Location for a 2007 Toyota Land Cruiser
    We have had customers state that the location of the brake controller port on the Toyota Land Cruiser is under the dash behind the switches for the mirror. You will need to take apart the lower dash panel and then push out the switch panel. There is no need to detach any switch, it all hangs out just fine according to one customer. I have included the pictures they sent to us.
    view full answer...
    Image 1 for Image 2 for
  • Where is the Brake Controller install Port on a 2011 Lexus LX570
    The harness you need to install the Brake Controller Adapter part # 3040-P will be located underneath and left of the steering column, taped to another harness near the emergency brake pedal. There will be a 5-pin connector that mates with the one on the adapter. I attached a picture that shows what it would look like.
    view full answer...
    Image 1 for
  • Tekonsha Brake Controller Wire Replacement for a 2008 Toyota Tundra
    The 3040-P Tekonsha Wire Replacement for Toyota and Lexus Vehicles would be the correct harness for your vehicle. We also have an instructional video that shows the whole installation process, step by step. I have linked it below.
    view full answer...
  • Brake Controller Wiring on a 2007 Toyota Tundra
    If your Tundra came with a brake control wiring harness you can use that to hardwire and install the Prodigy brake controller. If you prefer there is a custom wiring harness from Tekonsha,part # 3040-P, which would eliminate any need to hardwire. Simply plug the custom harness into the brake control port under the dash and then into the back of the controller. You can view a copy of the Prodigy installation instructions by clicking the link below.
    view full answer...
  • Brake Adapter for 2009 Tacoma without Tow Package
    If your truck came off the line with a factory 7-way plug, you have an electrical tow package. This means you are set up for a brake controller. However, it sounds like the hitch wasn't included. Since you have a plug under the dash, your wiring is there and this adapter will work for you with our Tekonsha brake controller.
    view full answer...
  • Length of Tekonsha Wire Replacement # 3040-P
    I went out to the warehouse and measured the Tekonsha Wire Replacement # 3040-P and it is 32 inches long. This is a fairly long harness and, depending on where you have everything mounted, could potentially reach where you need it to go.
    view full answer...

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