factory trailer brake controller problem - Chevy and GMC Duramax Diesel Forum
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post #1 of 13 (permalink) Old 06-14-2010, 07:38 PM Thread Starter
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factory trailer brake controller problem

I am having trouble with my factory brake controller. I was not getting any responses out of it when i plug a trailer in or when I push any of the buttons. When I plugged the tech 2 in it is telling me that the trailer brake controller is disabled. Whats up with that? I couldnt find an option to enable it. we tried reprogramming it and that didnt change anything. I checked the fuses. I noticed there is a round plug hanging down inder my dash with a single flat pin in the middle about an inch in diameter, should that be plugged in somewhere? It has not worked since I got the truck 3 weeks ago and it really sucked today hauling 15k of lumber without trailer brakes!

had 2001 GMC 2500HD Ext cab stock except 285 85 16 hancook dynapro atm tires. 200,000 hard miles and starting to need a lot of work.

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post #2 of 13 (permalink) Old 06-15-2010, 07:55 AM
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You do know that you have to have the ignition switch OFF when you plug in the trailer-- then when you start the engine, it will recognize the trailer. Other than that, check the fuses under the hood.

Others may have ideas.

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post #3 of 13 (permalink) Old 06-16-2010, 12:26 PM
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It doesn't on mine, I just connect the trailer, the truck makes a "beep" sound and then says "Trailer Connected" then changes to the trailer brake controller screen on the dash...
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post #4 of 13 (permalink) Old 06-16-2010, 12:37 PM Thread Starter
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Mine doesn't do anything at all

had 2001 GMC 2500HD Ext cab stock except 285 85 16 hancook dynapro atm tires. 200,000 hard miles and starting to need a lot of work.

New Toy:
2008 Chevy Silverado LT 3500HD CC.
235/80/17 Hankook dynapro ATM tires
B&W turnover hitch

Coming soon efi live, 4"duals, and gauges!

DMAXSTORE.COM, Your Duramax Diesel-Only Shopping Resource
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post #5 of 13 (permalink) Old 06-17-2010, 07:01 PM Thread Starter
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still no luck on figuring this out. how hard is it to take the factory controller out and add a differant aftermarket one and which one would be the best. I pull a large gooseneck weighting 15-18k.

had 2001 GMC 2500HD Ext cab stock except 285 85 16 hancook dynapro atm tires. 200,000 hard miles and starting to need a lot of work.

New Toy:
2008 Chevy Silverado LT 3500HD CC.
235/80/17 Hankook dynapro ATM tires
B&W turnover hitch

Coming soon efi live, 4"duals, and gauges!

DMAXSTORE.COM, Your Duramax Diesel-Only Shopping Resource
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post #6 of 13 (permalink) Old 06-17-2010, 07:28 PM
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My brake controler would come up with errors if I had a trailer connected with brakes on it. No trailer brakes, no problem. Dealer swore it was my trailer brakes so rewired them (need to be done anyway) with no lick. Dealer finally found bad ground from brake controller to body. May want to check that out.

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post #7 of 13 (permalink) Old 06-17-2010, 08:38 PM
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If you are talking' about the Integrated Trailer Brake Controller, attached is a document I put together explaining it's several components and circuits.

Getting it to work the first time, can be a real PITA, if you don't have this info. Been there.
Attached Files
File Type: pdf Trailer Brake Control System 2.pdf (63.2 KB, 594 views)

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post #8 of 13 (permalink) Old 09-07-2015, 04:56 PM
 
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Our 2008 3500HD POS has the same problem. Along with many others. I have heard that it might be a relay. Which one? Where is this found? How to test? So best solution is to rip that crap out and replace with an aftermarket controller? Will this still have all the warning lights on the dash? If we use an aftermarket controller how can we by pass (turn off) all the warning lights on the dash. Boy Chevrolet seems to has a lot of issues with this controller. Should have been a recall...
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post #9 of 13 (permalink) Old 09-07-2015, 05:07 PM
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Yup. Should be a trailer relay under the hood.

Are you happy now Dukcaln?

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post #10 of 13 (permalink) Old 09-07-2015, 05:11 PM
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Quote:
Originally Posted by KristopherT84 View Post
I am having trouble with my factory brake controller. I was not getting any responses out of it when i plug a trailer in or when I push any of the buttons. When I plugged the tech 2 in it is telling me that the trailer brake controller is disabled. Whats up with that? I couldnt find an option to enable it. we tried reprogramming it and that didnt change anything. I checked the fuses. I noticed there is a round plug hanging down inder my dash with a single flat pin in the middle about an inch in diameter, should that be plugged in somewhere? It has not worked since I got the truck 3 weeks ago and it really sucked today hauling 15k of lumber without trailer brakes!
Just out of curiosity.. Do u know that its an actual problem with the integrated brake controller or the 7pin plug in at the rear of the truck.? Im only asking cause i didn't see anything in regards to trouble shooting location...

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