Can Brake Controller of 2018 GMC Sierra 3500 be Bypassed with Aftermarket One

Question:

I would like to know if I can add a after market brake controller to my 2018 GMC 3500HD that already has the factory brake controller. Is this possible? If so, just plug and play? Or, computer the factory controller?

asked by: Jeff L

Expert Reply:

In order to bypass your factory installed controller in your 2018 GMC Sierra 3500 and install an aftermarket brake controller like the Prodigy P2 Trailer Brake Controller, # 90885, with Plug-In Wiring Adapter, # 3016, you will have to make a couple of cuts and connections.

You will then take a length of wire, # 10-1-1, and connect it to the blue wire you removed from the connector.

Route the blue wire through the firewall, under the truck, and to the trailer connector. Avoid hot or moving parts like suspension and exhaust.

At the trailer connector, remove the wire in the 7 oclock position (looking at the back of the connector where the wires attach). Tape it up and stow it out of the way. Then attach the wire you ran to the 7 oclock position. This will bypass the factory controller without causing any dash lights/error messages to appear.

The 10-1-1 wire is sold in lengths of 1 foot. So if you needed 20 feet you would put 20 in the quantity box.