Duramax Trailer Brake Issue Solved!! Cheap and Easy Fix!! 

Awesome! Ordered the trailer brake relay switch on Tuesday. I started getting the the service trailer brake system on Monday. I get the travel trailer all hooked up and my trailer brakes would not engage (Had reservations for this weekend and was loaded and noticed the trailer brakes would not work). Well, just received the part 30min ago and installed it and what do you know....The service trailer brake system does not show up anymore on my dash. Well, this video helped because my brakes on my trailer now engage!!!!! Beer 30!

Also y’all, clean all your grounds good. My 2013 had a Bus A failure which can be low battery voltage or bad ground or In my case the relay in fuse box was bad. This can be a very complex issue with a bad PCM as worst case. This video was by far the best I FINALLY found after 2 months and fixing it myself but I’m ordering that relay right now just to be safe. Good luck!

Hi there, thanks for putting together the video, here’s my situation, exact, same truck, and had the trailer brake warning come on, took it into the shop, as I had another issue that needed, addressing, and as soon as I went to go to a trailer it was clear it was not Repaired. I need to check with my shop once they’re open after the weekend to see if they did the same repairs or different, all I know is when I went to go plug in my trailer I didn’t hear the characteristic dings from the cab, and after the first smile knew right away, that my time and money have been wasted, if I can fix my truck at home after watching your video, I/O, you a beer!

wow, why couldnt i find this video last year? Ended up breaking bolts because i did not realize that i could slide it out. now i know. thanks.

THANK YOU! Ordered the parts on amazon. Penetrating oil worked great. And it was a very easy fix. Appreciate it greatly. 2008 GMC 2500 DMax.

Mine wound up being the relay in the fuse box which I heard a while back chattering badly when it all got damp. It’s the relay second from firewall and can be changed out with parking light relay to check. It’s also same as starter relay which I bought a 2pk a yr ago.

I just fixed my 2011 Silverado 2500 HD Diesel and the part was found above the spare tire

I replaced the relay but the light is still on. Is there an extra step after replacing the relay or should the light just go off

Worked like a charm on my 2008 gas 6.0L. Thank you!

Great to know if I come across this problem, I would of put dialectic grease on the connection but thanks 👍

Thanks for the video and the links for the parts. Delivered from Amazon like in a day and a half. I have a 2008 dually so mine is on a bracket off the inside frame rail. Yes on the wd-40 spray or something similar. Very easy fix.

Thank you for the video, I got lucky and it was just a fuse. I loaned the truck out, they pulled a trailer and blew the fuse.

Is there a way I can test this part before replacing? I do have a multimeter.

Mine is a 2011. But no brake power at the plug. Hopefully the relay is In the same place as yours. I’ll check it out. Thanks for sharing!

Thank you so much u are the only person I found that talked about that 30amp fuse , I thought I checked everything. I was getting pissed 😆. 2014 sierra 2500 hd fixed everything

Same problem on my truck Help me a lot 👏👏👏👏

Pro tip: spray that dirty/dusty connector down with foaming glass cleaner to loosen and flush out debris to make it easier to disconnect.

Totally fixed my 2008 LMM Duramax! Thanks only needed the relay fuse was fine

I got 2008 Chevy Silverado HD Gas it might be able to find that relaty in the same location?

Question... my'08 will throw this message only when I'm NOT connected to my trailer. When I plug my trailer in, I have to turn off the ignition and restart. Message goes away and trailer brakes work fine. When I disconnect the trailer, the message comes back. Any ideas? Thx in advance!

Thx so much brother! I had no idea where to start! But do now! U tha man!

Thank you helped me out a lot buddy. Worked great on my 2007.5 LMM

What does the red wires do to go to the two stud bolts on the fuse box

Thanks Murph! Shop truck had the same issue, got her all sorted now.

I just got the “service the trailer brake message “ Aswell as the abs blinking on and off when the trailer message pops up, is this the same issue ?

Would this cause the p0571 fault I have the service trailer brake system. My brake lights are stuck on illuminated with the running lights.

I just got the some problem and did everything as the video but still having the problem “brake system trailer” and the emergency brake on too..

Don’t replace the 9831 relay switch above the 30 amp fuse, that ain’t it! Thanks for the good info

I have a 06 Duramax ripped these wires out with the front driveshaft can anyone tell me where those two ground wires go that's on the frame right behind the driver side front tire thanks

I thought it would be the same for a 2010 Chevy suburban 2500 I cannot find this thing anywhere

Thank you so much!! Duramax is back in action

And if this don't work then what ?

Thanks I didn't know why did the light came on know I know

Will this fix work for my 2011 Chevy duramax 6.6

Do you have to put the bolts back in or can you zip tie it?

What size torques head screws? Can’t see them on my 2011 duramax 3500wt.

what's the reason it gies bad, i have to change every year

this did not correct this issue in my 20090 GMC 3500hd Duramax.

Thank you very much. For the very important help great job

Do you have to get the box programmed

Question I did that on my 08 duramax but the service trailer break system stills come on any ideas

I replaced the relay and the fuse and the service light still on. 😡😡

Damnit so the problem iant the trailer wiring ?

Thanks, I needed that info.

I just replace mine and a fuse and it didn't take care of the problem

What part of the country you live in? Dang rusted truck, I lived in Chicago and my 2002 truck has just been replaced with a less rusted truck. My issue remains on my 2012 but think my ABS sensor is affecting me. I added new fuse and new relay.

Thanks for video help replace same part but the message not go away any fuse related?

@youbreakityoufixit do you have an after market trailer break system or is it from the factory?

Could you upload cheap mirror mods for 02 f150s?

How did you clear the code?

fuse ok so change the modul control still have the trailer service brake advise 😳

Thanks ! 👍🏽

Thanks alot man!👍

Changed mine and did not fix problem

Where is the jcase fuse located?

It didn’t fix mine

thank u got part out 2008 Silverado 2500

Ty men

you might want to do something with that frame before it get to bad

Your poor frame 😟 where do you live?

J'aimerais que sa soit en français

I’m having a problem with my electric trailer brakes. They work but just barely they don’t feel strong enough and they barely slow down my trailer when I hit the brakes. My truck Gail is on 10 and I replaced my trailer brakes. Anyone can help?

Nice rot

Clean the bolts and put never seize on them. Take some pride in your work.

No offense, but I’ve watched three videos now and every single one has a totally different solution for fixing this problem. So it would have been nice if you had mentioned exactly how you determined it was the Relay versus the switch versus the control box. You can’t just start off and say its the Relay without explaining how you came to that conclusion. Also, please don’t title this video easy. A cheap and easy fix means to push the reset button or disconnect the battery. Replacing a relay on the frame rail is not considered “easy”