The simplest electronically controlled suspension systems merely maintain a level ride height, counteracting the tendency of the weight of passengers and luggage to lower the rear end. Systems with four-wheel height adjustment lower the automobile's ride height to reduce aerodynamic drag and improve fuel economy at highway speeds. In off-road vehicles, these systems can raise the vehicle to increase ground clearance over rough terrain.

Other systems are adjustable and allow the driver to switch manually between a soft-ride mode and a firm-handling mode. Some systems also offer intermediate choices. The most advanced systems automatically switch back and forth between soft and firm modes in milliseconds, depending on the condition of the road. These systems also work to keep ride height constant and to minimize roll. Consequently, the automobile has a better combination of ride and handling characteristics under various conditions than do cars with conventional suspension systems.

Electronically controlled suspension systems cost considerably more than conventional suspension systems. They are typically found only on relatively expensive luxury-class automobiles, high-performance sports cars, racing cars, and more expensive sport utility vehicles.

The latest innovation in the world of suspension systems is the active suspension. The system incorporates a microprocessor to vary the orifice size of the restrictor valve in a hydraulic suspension or shock absorber. This changes the effective spring rate. Control inputs may be vehicle speed, load, acceleration, lateral force, or a driver preference.