Traction Control

When LaCrosse's powertrain control module (PCM) computer detects excessive front-wheel spin, it makes a series of adjustments to help the spinning tire regain traction. First, it applies brakes to the wheel. Then it reduces power by retarding the spark to all engine cylinders. Next, if necessary, the PCM cuts off fuel to up to three cylinders. Finally, the PCM can elect to slow rotation of the drive wheels by shifting the transmission out of first and into second gear. When traction is restored through any of these intervention measures, the PCM returns full control to the driver.