See also:

Engine Power Messages
ENGINE POWER IS REDUCED This message displays when the vehicle's engine power is reduced. Reduced engine power can affect the vehicle's ability to accelerate. If this message is on, but t ...

Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if ...

Removing the Flat Tire and Installing the Spare Tire
1. Do a safety check before proceeding. See Changing a Flat Tire. 2. Turn the wheel wrench counterclockwise to loosen all the wheel nuts, but do no remove them yet. 3. Turn the jack handle cou ...