The 2003 GMC Envoy is a sport utility vehicle (SUV) manufactured by General Motors. The Envoy is equipped with both two-wheel and four-wheel drive capabilities, which you can switch back and forth into at your discretion. When your automobile is in four-wheel drive, the driving power of the engine is equally divided among all four wheels, which gives you more traction. The Envoy has four different driving settings that you can choose from, all of which are selected by turning a dial.
Sit in your driver's seat and locate the automatic transfer case (ATC). The ATC is located to the right of your steering wheel on the instrument panel, which is the portion of your dashboard that contains the vehicle's warning lights, speedometer and temperature gauge.
Locate the transfer case knob. The knob is circular and is situated on top of the ATC.
Turn the knob until the white tip of the handle is pointing to your desired driving setting. Switching between two-wheel and four-wheel drive settings can be done while driving your '03 Envoy at any speed, but be sure to exercise caution and maintain control of your vehicle at a speed that is comfortable for you. Each individual setting should only be selected when the driving conditions are appropriate for its respective benefits. There are four settings: 2HI (two-wheel high), A4WD (automatic four-wheel drive), 4HI (four-wheel drive high) and 4LO (four-wheel drive low). The default factory setting for your Envoy is 2HI, which is the appropriate setting for driving on most road and highways surfaces and offers the best fuel economy. Selecting the A4WD setting is the best choice when road conditions become unpredictable and quickly varies between wet, dry, smooth and rough terrain. While driving in A4WD, your Envoy will engage your front axle, but send the vehicle's power to the rear wheel. A high-tech computer system will detect any loss of traction and automatically engage in four-wheel drive, when necessary. Select the 4HI setting when you need extra traction on snowy and icy roads or in most off-road situations. Select the 4LO setting when you are driving off-road, stuck in deep mud or driving on steep hills. The 4LO setting sends maximum power to all four wheels, which gives you the most traction and it also engages your front axle, delivering more torque to your vehicle.
