Troubleshooting 2015 GMC 2500 Factory Brake Controller With No Signal at 7-Way Connection

Question

Question:

I have a 2015 GMC 2500 Duramax and it has a factory brake controller. When I hook up to a trailer that has brakes the controller does not even recognize that it is hooked to a trailer therefore trailer brakes will not work automatically or manually. When I have a helper apply manual brake on controller I don’t get a signal to 7 blade receptical with a test light either. If you can help that would be great thanks

asked by: Troy B

0

Expert Reply:

There are a couple connections that need to be made to activate your factory brake controller. You will need to attach a couple wires under the hood to give power to your controller. If these are connected then you will want to check the engine bay fuse block for fuse #1 in the micro J-case fuses which is the trailer brake fuse.

expert reply by: Jason S

0

Answer 1

Some factory trailer brake controllers are not compatible with trailers that use an electric-over-hydraulic actuator such as #HBA-10. Aftermarket controllers like the excellent Tekonsha Prodigy P3 #90195 include a setting to allow for proper…

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Answer 2

To determine why you do not have any power on the blue brake output wire, I recommend starting at your brake controller. First, make sure the brake controller is on and receiving power. Most brake controllers have 4 wires, blue (brake output to…

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Answer 3

According to the owner's manual for a 2015 GMC Sierra, the "Service Trailer Brake System" error message can appear on models equipped with the factory integrated trailer brake controller (ITBC) and represents a problem in the trailer…

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Answer 4

Pushing the pin back into the breakaway switch should allow the brakes of the trailer to release. You may have to back the trailer up slightly to get the brakes to release. If you have tried that and are still having problems you may need to replace…

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Answer 5

Like you said, many factory integrated brake controllers will not work well with electric over hydraulic trailer braking systems. Some of the newer versions of these controllers now have an electric over hydraulic mode. Check to see if any of your…

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Answer 6

If you're speaking of the OEM brake controller, then the ITBC on the 2021 GMC Sierra is compatible with electric over hydraulic braking systems such as the Dexter brake actuator used on your Keystone Montana Legacy. If your truck has the OEM…

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Answer 7

In the Engine compartment on the driver's side, there is a fuse block. In the #1 location there is a micro J-case fuse for the Trailer Brake. There is not a relay for this on your 2015 GMC Sierra 3500. Your owners manual does have a relay on the…

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Answer 8

It is possible that the 12 volt circuit is not present on your 2009 Chevy Silverado or GMC Sierra. For some reason GM did not always complete the tow package wiring. If the proper wires are not already present on your truck then you can manually run…

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Answer 9

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 10

If you are referring to two white wires from the brake magnet that are coming from the rear of each electric brake assembly, then it would not matter which wire is connected to ground and which wire is used for the brake feed. The magnet that…

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Answer 11

Trailer wiring generally uses 16 gauge wire, part #16-1-1. However, with a long trailer like yours you may want to go with a larger like 14 gauge #DW07550-1 or even 12 gauge #12-1-1. Each size is sold by the foot. You will need to have the lights at…

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Answer 12

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Troubleshooting 2015 GMC 2500 Factory Brake Controller With No Signal at 7-Way Connection

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