2009 GMC Envoy Owner's Manual - Page 176

Reduced Engine Power Light This light comes on when a noticeable reduction in the vehicle's performance occurs. Highbeam On Light This light comes on when the high-beam headlamps are in use. The vehicle can 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 dealer as soon as possible for diagnosis and repair. This light may also come on if there is a problem with the Electronic Throttle Control (ETC) system. If this happens, take the vehicle in for service as soon as possible. See Headlamp High/Low-Beam Changer on page 3-8 for more information. Service Four-Wheel Drive Warning Light This light should come on briefly when you turn on the ignition, as a check to show you it is working. 3-44