A vehicle includes first and second wheel assemblies, a steering wheel, a driver-actuatable input supported on the steering wheel, and an active stabilizer bar. The stabilizer bar has a first end connected to the first wheel assembly, a second end connected to the second wheel assembly, and a coupler connected between the first and second ends and configured to provide a variable torsion force between the first and second ends. A controller is programmed to, in response to actuation of the driver-actuatable input, command the coupler to modify the torsion force.