2005 GMC Envoy Owner's Manual - Page 182

Cruise Control Light The cruise light appears whenever you set your cruise control. 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. Highbeam On Light This light will come on when the high-beam headlamps are in use. Reduced Engine Power Light This light is displayed when a noticeable reduction in the vehicle's performance may occur. See Headlamp High/Low-Beam Changer on page 3-8. 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 dealer as soon as possible for diagnosis and repair. 3-46