This light will come on briefly when you start the engine.

This light , along with the service engine soon light, will be displayed when a noticeable reduction in the vehicle's performance may occur. Stop the vehicle and turn off the ignition. Wait for 10 seconds and restart your vehicle. This may correct the condition.

The vehicle may be driven at a reduced speed when the reduced engine power light is on, but acceleration and speed may be reduced. The performance may be reduced until the next time you drive your vehicle. If this light stays on, see your GM dealer as soon as possible for diagnosis and repair.