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2019-2023 Sierra/Silverado: Trailer Brake Controller Install

Time: 30min - 1hr (mounting preference)

Difficulty: easy-moderate

Cost: $150-250

Unfortunately, you cannot add an OEM trailer brake controller to your GM product if it didn't come equipped from the factory. GM did, however, provide connector access into the main harness for aftermarket controller installation.

Watch the video below to see the trailer brake controller installation on a 2020 GMC Sierra 1500 Pickup. Connector location, splicing, and mounting shown. The process is the same for Silverado, Tahoe, Yukon, and Suburban. 2019, 2020, 2021, 2022, 2023.

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Drill Bit Set

Cobalt steel drill bit set

Heat Shrink

Heat shrink assortment

Soldering Hands

Soldering helping hands

Wire Loom

1/4" wire loom cable sleeve

Brake Controller Adapter

Tekonsha to GM brake controller adapter

Tekonsha P3 Brake Controller

Proportional trailer brake controller

Torch Tip

Trigger start torch tip


0.6mm lead rosin core solder wire

Soldering Iron

Weller Digital Soldering Station

1-1/4" Square Tubing

1-1/4" x 12" Square Tubing

Tekonsha Prodigy iD

Smart trailer brake controller

Zip Ties

8" Heavy Duty Zip Ties

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