How Much Does It Cost to Install a Trailer Brake Controller
What is the answer to my immediate question?
Installing a trailer brake controller usually costs between roughly $150 and $350 for labor when you already have the part, though the total can move above or below that range depending on your vehicle, existing wiring, and local shop rates. The cost is materially different if a prewired factory connection is present: many pickup trucks and larger SUVs have a plug under the dash, which can reduce installation to mostly mounting and programming. Vehicles without any prewiring, or those needing a dedicated power feed from the battery through the firewall, take more time and cost more.
That labor range does not include the controller itself. A basic time-delayed controller and a proportional controller are different products, and the unit price is separate from installation. If a shop quotes a combined price, expect the part cost and labor to be itemized or bundled together.
What changes the installation price
Prewired factory connection: Many trucks have a plug near the driver’s footwell that accepts a vehicle-specific adapter harness. This lowers labor time. No factory wiring: If the vehicle has no brake controller plug, a shop may need to run a power wire from the battery, find a brake signal circuit, and route a ground. This increases labor. Controller type: A proportional controller often needs a secure, level mounting surface and may include initial calibration. A time-delayed unit is typically simpler to mount and adjust. Trim and tow package: Vehicles with a factory tow package may already include the connector and fuse position, while trims without it may need additional wiring or an added circuit. Shop rate: Independent shops and trailer or RV service centers often charge different hourly rates than dealerships.
What the job involves
A typical installation covers finding a stable mounting point under the dash within driver reach, connecting power, ground, brake signal, and trailer brake output circuits, then securing the harness. If the vehicle is prewired, the technician usually plugs in an adapter rather than splicing factory wires. After installation, the controller is set according to the trailer’s brake type and adjusted during a test stop.
A vehicle with adaptive cruise control, electronic stability control, or an integrated trailer brake option may use a different signal source, but the basic wiring task is the same. The relevant condition is whether the factory circuits are already present.
Cost ranges by common scenario
Scenario | Typical installation labor; Prewired truck or SUV with factory plug | About $150–$250; No prewiring, standard car or crossover | About $250–$400 or more; Dealership install on prewired vehicle | Often at the higher end or above independent shops
These are general ranges, not fixed prices. A quote should be based on the specific model year, market, trim, and whether the vehicle has a factory tow package.
Questions to ask before approving the work
Does my vehicle have a factory brake controller plug, or will new wiring be needed? Is the quoted price labor only, or does it include the controller and any adapter harness? Is the controller compatible with my trailer’s brake type, such as electric or electric over hydraulic? Will the shop test the output with a trailer connected, or only verify power at the plug?
The main cost gap is between a prewired vehicle where the job is mostly mounting and setup, and an unwired vehicle where the technician must add the circuit path. Confirming that condition before booking the work will give a more accurate estimate than a generic quote.