Yes, traction control can cause reduced engine power. When the traction control system detects a loss of traction in one or more of the wheels, it can reduce engine power to prevent the wheels from spinning and regain traction. This can result in a "reduced engine power" message being displayed on the dashboard. However, it's important to note that there can be other causes of reduced engine power as well, such as a malfunctioning electronic throttle control system or a clogged air filter.