This adapter is designed to plug into an existing 7-way socket to provide a new 7-way socket that is able to recognize LED trailer lights. No splicing required! Lowest Prices for the best Wiring from Curt. 7-Way to 7-Way LED Trailer Light Adapter for Audi, Porsche and Volkswagen part number C57003 can be ordered online at or call 800-298-8924 for expert service.
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Wiring > Wiring Adapters > Single-Function Adapter > 7 Blade > 7 Blade > Plug and Lead > Curt

7-Way to 7-Way LED Trailer Light Adapter for Audi, Porsche and Volkswagen

Curt Wiring

(8 reviews)

Code:   C57003



Shipping Special

Shipping Weight: 3 pounds


Curt Wiring - C57003

This adapter is designed to plug into an existing 7-way socket to provide a new 7-way socket that is able to recognize LED trailer lights. No splicing required!


  • Plugs into existing 7-blade socket
  • Provides new 7-way that works with LED trailer lights
  • No splicing required
  • Fits:
    • 2007-2012 Audi Quattro
    • 2004-2013 Porsche Cayenne
    • 2004-2012 Volkswagen Touareg
    • 2004-2012 Volkswagen Colorado

57003 Curt 7 Way LED Trailer Light Adapter

Video of 7-Way to 7-Way LED Trailer Light Adapter for Audi, Porsche and Volkswagen

Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.

Video Transcript for Curt Wiring C57003 Review

Today we're going to review part number C57003. This is the Curt 7-Way to 7-Way LED Trailer Light Adapter for Audi, Porsche and Volkswagen. This is a custom fit adapter, this is designed to fit the 2007 to 2012 Audi Quattro, the 2004 to 2012 Porsche Cayenne and the 2004 to 2012 Volkswagen Touareg. Basically what this does is right here we'll plug into your existing 7-way on your vehicle. Then it provides this new 7-way that will work with LED trailer lights. If you plug in your trailer and it has LED lights, this will actually contain, right in here they do put resisters, load resisters.

What that will do is simulate the increased power draw so the vehicle thinks there is incandescent lights on the trailer. Then you won't get the lamp bulb out reading that usually flashes on the dash of those vehicles. There is no splicing required, just a plug in piece. That should do it for the review on part number C57003. The Curt 7-way to 7-way LED trailer light adapter for Audi, Porsche and Volkswagen. .

Customer Reviews

7-Way to 7-Way LED Trailer Light Adapter for Audi, Porsche and Volkswagen - C57003

Average Customer Rating:  4.1 out of 5 stars   (8 Customer Reviews)

This adapter is designed to plug into an existing 7-way socket to provide a new 7-way socket that is able to recognize LED trailer lights. No splicing required!

- C57003

by: Richar F.09/03/2014

Item worked great. After 3 1/2 years of the dealer trying to figure it out, this did the trick. Back up circuit on the factory wiring for the trailer did not work, although all the other circuits did, even with LEDs on the trailer. Now all of it works. If I could just get rid of the error messages looking for trailer directionals and running lights. I am just using the plug for auxillary back up lights which now work nicely. Adapter is used on Mercedes GL 350. 149898

- C57003

by: eTrailer in the Know06/21/2013

Ford's better idea caught up with them on my 2013 Escape. computer notified "trailer light fault" with each brake application & turn signal not hot to mention the fast blink of the turn signal. Etrailer tech knew of fix for European autos and trailers with LED lighting. Works like a Champ and an Easy Install. 85475

- C57003

by: Tim04/01/2015

Worked perfect on my 2005 Cayenne S. Trailer lights are blinking dimly and only brake light works without this. No parking lights nor signal lights work too. I'm going to let everyone on Porsche Cayenne knows about this product. 182127

- C57003

by: John Dzerdz10/17/2014

Unfortunately this product did not stop the problem I'm having with my LED trailer lights. Possibly I ordered the wrong item. 156597

- C57003

by: Janis levesque07/27/2013

Not sure yet...this doesn't look like an "adapter" and I already have all original connections in we will see... 91960

- C57003

by: Richard S.11/12/2014

Solved all my lite problems. Good service, quick shipping. No complaints. 160583

- C57003

by: Alan07/25/2015

MB 2008 ML320 - LED problem solved GREAT SERVICE needed in two days got it 214344

- C57003

by: Sam E.10/22/2014

Simply did not work with my LR3 157463


Ask the Experts about this Curt Wiring
Do you have a question about this Wiring?

  • Adapter for 2010 Mercedes-Benz GL450 Towing Trailer With LED Lighting to Avoid False Short Indicator
  • The answer is that you are needing the TowReady # TR20141. This adapter is used because LED's draw such low power that a lot of times on German vehicles your lamp out indicator will illuminate giving you the impression that you have an issue, when in reality you do not. With this adapter you will be able to tow your trailer with your 2010 MB GL450 without a problem. The adapter has built in load resistors that create more draw so the sensors think everything is working normally. If...
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  • Using an Adapter to Tow a Trailer with LED Lights with a 2012 Mercedes GL450
  • Yes. If your trailer with LED lights has a 5-Way or 4-Way flat connector then you would use adapter # TR20141. If the trailer has a 7-Way connector you would need # C57003. These adapters have load resistors in them that provide additional power draw so the vehicle thinks there are incandescent lights on the trailer. The other option is to install load resistors, # P230004A, in line on each circuit on the trailer wiring behind its connector. You can also use this method if the resistors...
    view full answer...

  • Trailer Lights Do Not Work with 2014 Chevy Silverado But Do Work with 2008 Chevy Silverado
  • The trailer connector on the 2014 Chevy Silverado will be the same as previous generations because it is an industry standard. Factory integrated trailer brake controllers sometimes will not work with electric over hydraulic braking systems so if that is what is on the trailer then that could be the problem. The solution would be to install an aftermarket brake controller that is compatible with electric over hydraulic brakes like the P2, # 90885, using wiring harness # 3016. But since...
    view full answer...

  • Trouble Pairing the Tekonsha RF Trailer Brake Controller with an Audi Q7
  • Pairing problems are not uncommon with any wireless device and the Prodigy RF, # 90250, is no exception. At various points in the installation procedure the instructions will tell you that you should see something specific on the display. However sometimes the specific display does not show up. This is where most people stop and start all over. What you should do is keep going on to the next step. My contacts at Tekonsha have stated that for some reason what the instructions say should...
    view full answer...

  • Pollak 7-Way Vehicle Side Trailer Connector Options
  • We have several Pollak brand 7-Way trailer connectors. We have # PK11893 which is the type that accepts the wiring harness that just plugs into it. And we have # PK12707 that you have to hardwire the wires to. We also have a metal Pollack 7-Way, # PK12703. If if you happen to need 50 of # PK11893, you would use # PK11893-50. I was not able to find part PA66-GF30 on the Pollak site.
    view full answer...

  • LED Lights Flash on Trailer Towed by a 2008 Land Rover LR3 Using Adapter # C57003
  • The 7-Way to 7-Way adapter, # C57003, is designed to work on German vehicles like the VWs, Audis, and so on to deal with a bulb-out sensor issue present on those vehicles. It may not work the same for other applications like on your Land Rover. If the LED lights on the trailer are not providing enough power draw on the system you can try installing some load resistors on each of the lighting circuits (right turn/brake lights, left turn/brake lights) behind the trailer connector. You...
    view full answer...

  • Turn Signal Hyperflash on Tow Vehicle Towing a Boat Trailer
  • It sounds like you have experienced a hyperflash condition. LED lights will flash like that because they do not provide enough power draw for the system to recognize them. Also, you should not mix LED and incandescent lights on a trailer. If the vehicle has LED lights and the trailer has incandescent lights then as long as the vehicle has the proper converter installed or has the factory wiring harness it should be fine unless it is the factory harness on a German vehicle like a BMW...
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  • LED Trailer Tail Lights Will Not Work when Connected to a 2009 Mercedes GL550 with Factory 7-Way
  • There is an issue with German vehicles (Audi, Mercedes, Porsche, BMW, Volkswagen, and so on) and trailers with LED lights. The LED trailer lights do not offer enough draw on the system for the lights to work. On a lot of these vehicles you will also get a bulb-out warning in the vehicle. The solution is to use an adapter that has load resistors in it, # TR20141, to provide enough draw so the lights will work and so you will not get that bulb-out warning. The adapter will go from a 7-Way...
    view full answer...

  • LED Lights on Trailer will not Work When Towed with 2008 Mercedes-Benz ML320CDi
  • An adapter like the 7-Way to 7-Way LED Trailer Light Adapter, # C57003, contains load resistors which simulate increased power draw so the vehicle thinks there are incandescent lights on the trailer. Just plug this adapter into the back of your Mercedes, plug the trailer into the new 7-way, and you should be good to go. Your vehicle should now recognize the trailer.
    view full answer...

  • Recommended 7-Way Trailer Connector Extension for a 2014 Ram 2500
  • What I recommend is the Curt universal extension # C56080. It will plug directly into your existing 7-way connector and provide you a length of 7 feet. If you only need a few more inches of play, the adapter # C57003 you referenced will work fine. I included the installation instructions for you too.
    view full answer...

  • Length of the Wire on the Curt 7-Way Adapter part # C57003
  • I pulled a Curt 7-Way Adapter par # C57003 from our warehouse to measure it and found that the wire measures 9-1/2 inches from the back of the mounting surface to the end of the plug. Check out the video I attached to see this measurement.
    view full answer...

  • Will 7-Way to 7-Way LED Trailer Light Adapter for German Vehicles Fit a 2014 Volkswagen Touareg
  • Yes, you can use the Curt 7-Way to 7-Way adapter # C57003 with your 2014 Volkswagen Touareg. It can actually be used with any vehicle that has a 7-Way. The vehicles listed were the ones that this adapter was originally created for because that is when the issue with LED lights and bulb-out sensors became apparent.
    view full answer...

  • How to Mount 7-Way to 7-Way LED Trailer Light Adapter # C57003 on 2005 Porsche Cayenne
  • The 7-Way to 7-Way LED Trailer Light Adapter, # C57003, can be mounted to any flat surface under your 2005 Porsche Cayenne using the mounting holes on the top of the adapter. Since the 7-Way to 7-Way, # C57003, has the mounting bracket molded to the top, you would not be able to use this adapter with the Curt Easy Mount Bracket, # C58000.
    view full answer...

  • Can Factory Trailer Wiring Harness on 2015 Porsche Macan Deliver 40-Amps Current for Chair Lift
  • Since we do not sell the OEM wiring harness that was factory installed in your 2015 Porsche Macan you can determine its amperage capacity by checking with your dealership or by seeing what value fuse is associated with it. It is NOT likely that the wiring harness can deliver 40-amps especially if the vehicle uses low-power-demand LED lighting. You'll also want to confirm the actual power draw from the lift's motor; is the 40-amps continuous or peak current draw? Tri-Lift offers several...
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  • Trailer LED Tail/Clearance Lights Illuminate at a Low Level Even When Tow Vehicle is Not Running
  • It is not unusual for extremely-efficient LED trailer lights to show residual low-level illumination when installed in lighting circuits that originally had incandescent lights. These circuits typically always carry some small amount of power even when the tow vehicle is off. With low-efficiency incandescent type lighting this low power will not be evident as it is not enough to cause those bulbs to light up, but with super-efficient LED lights it can be enough to make them illuminate. The...
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  • Trailer Connector Adapter to Fix Bulb Out Sensor of 2014 Porsche Cayenne and Trailer with LED Lights
  • I am not sure what the strange connector is on your 2014 Porsche Cayenne but it should have the standard 7-Way blade style on it. Adapter # C57003 is designed to solve that bulb out issue. But if your trailer does not have the 7-Way blade style connector then in addition to this adapter you would need either another adapter or replace the 7-Way output end of the above adapter with the correct vehicle side connector that is compatible with your trailer. So that begs the questions: what...
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  • Adapting 2004 Porsche Cayenne 7-Way Trailer Connector to Trailer with 7-Way Rectangular Connector
  • We do not have a converter to go from a 7-Way blade-style trailer connector to a rectangular 7-Way. You will need to either change the connector on the 2004 Porsche Cayenne or the one on the trailer. The one on the trailer will be easier to change. You could use # H20042. The wire functions are as follows: White is ground Red is left turn/brake lights Brown is right turn/brake lights Green is running lights Blue is output to trailer brakes (not needed since the trailer does not...
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  • 7-Way Trailer Connector for Use on 2006 Porsche Cayenne for Boat Trailer with LED-Type Lights
  • Curt offers a custom-fit adapter for the 2006 Porsche Cayenne that includes load resistors to allow the vehicle to pull a trailer with LED lighting. That item is part # C57003 and it is shown in the linked video. This adapter includes load resistors to allow vehicles like the Cayenne to properly activate LED trailer lights.
    view full answer...

  • Tekonsha P3 Controller Stays On with Bulb-Out Sensor Adapter Installed
  • The same reason the part # C57003 prevents your P3 # 90195 from falling asleep would be the same reason the # 20142 would do the same. Both of these adapters have resistors installed on the circuits. The only solution I could make for you would be to remove the # C57003 from your vehicle when not in use. Also, the LED display of your brake controller puts such a miniscule amount of draw on your vehicle that it would take weeks before it would adversely affect your battery life.
    view full answer...

  • Will Tow Ready 7 to 5-way Adapter for German Cars and LED Trailers Support Reverse Light Circuit
  • If you used the Tow Ready 7-Way to 5 or 4-way # TR20141 that you referenced with a trailer that has a 5-way then yes, the reverse light circuit will be active. If you used it with a 4-way then no it would not. That fifth circuit is for reverse lights. There would be no noticeable load or drain on the vehicles electrical system from the wiring of this adapter either. If you needed just a 7-way adapter that will work on the German cars that are sensitive to the LED trailer lights you...
    view full answer...

  • Troubleshooting a 2013 Ford Escape that Hyper Flashes When Connected to Trailer with LED Lights
  • You have a couple options to solve the hyperflashing problem you are experiencing with your 2013 Ford Escape when towing your RV. You can either use a product like the part # C57003 or you can take your vehicle to a Ford dealer and they will do a software update on your vehicle which should fix the problem. There should be a technical service bulletin that said that trailers with LED taillights can cause the Escapes to hyper flash and they can fix it if you bring the vehicle in to them.
    view full answer...

  • Trailer Connector Adapter to Tow Trailer with LED Lights with a 2009 Mercedes GL450
  • The adapters you mentioned, # TR20141 and # C57003 can be used on any vehicle. The bulb out sensor issue arises mostly on German vehicles like Mercedes, BMW, VW, and Audi. So despite it putting emphasis on VW, Porsche, and Audi they can be used for any vehicle including your 2009 Mercedes GL450.
    view full answer...

  • Reverse Lights on 2006 Volkswagen Touareg Blink With Curt 7-Way LED Trailer Light Adapter # C57003
  • According to my technical contact at Curt if the reverse lights on the your trailer are blinking even with the tow vehicle off, the most likely cause is a problem in the trailer's connector. Take a close look at the contacts on your trailer's 7-way plug to check for the possibility of a loose wire and/or corrosion on the contacts. A badly corroded plug could cause two circuits to be bridged together and this could lead to current reaching the pin for the reverse lights. The linked article...
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  • Solution for Pairing a Tekonsha RF Brake Controller to Vehicle with Bulb Out Sensors
  • The LED lights on the vehicle isnt so much the issue. Some European vehicles send signals through the trailer plug for Lamp out or Trailer detection that can interfere with the pairing process, but once the trailer is detected these signals pose no issue. Since you already have the # C57003 you might try to see if that helps the issue, but if not the easiest solution will be to find a domestic vehicle with a 7-way to pair. I attached an install video for you to check out as well.
    view full answer...

  • 7-Way to 7-Way Bulb Out Sensor Bypass Adapter for a 2006 Volkswagen Touareg
  • Even without that mounting block at the top of adapter # C57003 it still may not fit directly in place of the old 7-Way. This adapter is meant to plug into the existing 7-Way, leaving it in place, and then you would mount the other end to a nearby location. If your 2006 Volkswagen Touareg has a factory 7-Way and you want a more inconspicuous adapter you can use # 20142 which would be less invasive than # C57003.
    view full answer...

  • Will the Prodigy RF Trailer Brake Controller Work with a 2004 Volkswagen Touareg
  • The Prodigy RF, # 90250, can be used with any vehicle but there have been some pairing issues with it and German manufactured vehicles like the 2004 Volkswagen Touareg. Customers have found that the RF unit has trouble pairing with its handheld unit on these vehicles but the reason why is sort of a mystery. One way that people are able to get it to work is to park a different vehicle right next to the Touareg and connect the trailer and RF to it. Then they pair the handheld unit and...
    view full answer...

  • Is a Special Converter or Adapter Needed to Tow a Trailer with LED Lights
  • Most aftermarket trailer wiring harnesses are compatible with LED trailer lights but I would need to know the year, make, and model of the vehicle to be sure. Factory tow package wiring usually works fine but German vehicles (Volkswagen, BMW, Audi, Mercedes) can have issues since the LED lights draw far less power than incandescent lights. I have heard of only a few cases of other vehicle manufacturer tow package wiring being an issue with LED lights. But even if the low power draw causes...
    view full answer...

  • Will Curt 7-Way to 7-Way LED Trailer Light Adapter # C57003 Work with 2015 VW Tiguan
  • The Curt 7-Way to 7-Way LED Trailer Light Adapter # C57003 that you referenced is intended for use with certain German-made autos when pulling a trailer equipped with LED-type lighting. I did check with my technical contact at Curt and he confirmed that this will also work on your 2015 Tiguan when pulling a 7-way-equipped trailer with LED-type lights.
    view full answer...

  • Gooseneck/5th Wheel 7-Way Wiring Recommendation for a 2013 2500 GMC TRUCK
  • Yes, there is an adapter that will plug in line with the 7-way at the rear of your 2013 GMC Sierra and will allow you to also install a 7-way in the bed of your truck. You would want the Draw-Tite 5th Wheel/Gooseneck Wiring Harness 7-Pole # 20110. Check out the install video I attached for this product as well.
    view full answer...

Do you have a question about this Wiring?

Info for this part was:

Expert Research:
Michael H

Expert Research:
Jameson C

Expert Research:
Adam R

Updated by:
Sarah W

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