M-Class (W166) Produced 2012-2015

Trailer error codes

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Old Jun 18, 2014 | 09:53 PM
  #1  
Kenn1926's Avatar
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2013 ML550
Trailer error codes

Recently started towing my 25' Sea Ray(7000lbs+ with trailer). Has anybody experienced false error codes in the display for their trailer? They say to check the left/right trailer lights but everything is functioning perfectly. The right turn signal indicator also flashes at a faster rate as though a light is out, again, every indicator on the truck and trailer are operating properly... Strange. I use the adapter for the 4 pin connection to the trailer. I've towed this boat with an 04' grand Cherokee 4.7 V8, 08' QX56, 09' grand Cherokee 5.7 V8 and it's shocking how easily the 550 accelerates with all this weight behind it.
Attached Thumbnails Trailer error codes-image-3202506015.jpg  
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Old Jun 19, 2014 | 01:02 AM
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See attached -

This may help - if you have LED's on the trailer then you may need a adapter...
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Old Jun 19, 2014 | 06:37 AM
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I had the same problem with the ML and my camper trailer's LED lights. A Tekonsha adapter (7-pin to 7-pin in my case) fixed it.

It is interesting that my Audi Q7 never needed the adapter, and got along with the LED lights on the trailer just fine.
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Old Jun 19, 2014 | 07:17 AM
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2014 ML350 BlueTec
Not sure why but my 2014 ML350BT does not throw any error codes when pulling the Sea-Doo. All the lights are LED.
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Old Jun 19, 2014 | 07:18 AM
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It's an 06' trailer with surge brakes and standard incandescent light bulbs. It throws the warnings one time in the beginning, once I cancel them they don't come back. Again, all lights on the ML and trailer are working perfectly. The strangest part is the turn signal indicator flashing rapidly....
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Old Jun 19, 2014 | 07:45 AM
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2014 ML350 BlueTec
Originally Posted by Kenn1926
It's an 06' trailer with surge brakes and standard incandescent light bulbs. It throws the warnings one time in the beginning, once I cancel them they don't come back. Again, all lights on the ML and trailer are working perfectly. The strangest part is the turn signal indicator flashing rapidly....
Fast flashing blinker is pretty common when hooked up to a trailer.
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Old Jun 19, 2014 | 11:48 PM
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The adapter's help balance out the circuit load - for like $12 isn't it worth that to try to ease your mind ?
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Old Jun 20, 2014 | 10:02 AM
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What adapter am I looking for? I use a 7 to 4 pin adapter now. Is there a certain brand or type that may fix the issue?
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Old Jun 20, 2014 | 10:34 AM
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Originally Posted by Kenn1926
What adapter am I looking for? I use a 7 to 4 pin adapter now. Is there a certain brand or type that may fix the issue?
This will solve your problems.

http://www.tekonsha.com/content/prod...575&part=20141

Available at etrailer.com

https://www.etrailer.com/p-TR20141.html

Last edited by DUTCH; Jun 20, 2014 at 10:37 AM.
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Old Jun 20, 2014 | 10:37 PM
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Some say tomaato, some say tomAto... part is made by Tow ready their part # 20141 - w/shipping to my door HitchShops $16.30 from eTrailer $18.98.. 4 pin is old/old style and uses "top" 4-out-of-5 pins for running lights - 5th pin is used for reverse lockout..
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Old Jul 27, 2015 | 01:32 PM
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GL550
Sorry posted twice on this thread!

Last edited by CBR Dude; Jul 27, 2015 at 01:37 PM.
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Old Jul 27, 2015 | 01:36 PM
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GL550
Ok, I'm running a LED trailer and have a 2012 GL550 OEM hitch and wiring harness set up. Have never had an issue running the LED lights until the GL550. Also works on my other vehicles too without any issues. Ran fine on my GL450 and GL350 and VW. Which are supposed to have the same issue.

Installed the tow ready 20141 adapter.

New problem. The dash says trailer brake lights when turn signal or brakes applied. I thought this was the cure all, but like everything else Mercedes you have to beat it to death or get counselling.

Help!
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