2002 GMC Envoy Owner's Manual - Page 98

Shifting to 4HI or A4WD Turn the knob to 4HI or A4WD. This can be done at any speed and the indicator light will flash while shifting. It will remain illuminated when the shift is complete. Shifting to 2HI Turn the knob to 2HI. This can be done at any speed. Shifting to 4LO To shift to 4LO, the vehicle's engine must be running and the vehicle must be stopped or moving less than 2 mph (3.2 km/h) with the transmission in NEUTRAL (N). The preferred method for shifting into 4LO is to have your vehicle moving 1 or 2 mph (1.6 to 3.2 km/h). Turn the knob to 4LO. You must wait for the 4LO indicator light to stop flashing and remain illuminated before shifting your transmission into gear. If you knob to 4LO when your vehicle is in gear and/or moving, the 4LO indicator light will flash for 30 seconds and not complete the shift unless your vehicle is moving less than 2 mph (3.2 km/h) and the transmission is in NEUTRAL (N). After 30 seconds, the transfer case will return to the setting last chosen. Shifting Out of 4LO To shift from 4LO to 4HI, A4WD or 2HI your vehicle must be stopped or moving less than 2 mph (3.2 km/h) with the transmission in NEUTRAL (N) and the engine running. The preferred method for shifting out of 4LO is to have your vehicle moving 1 or 2 mph (1.6 to 3.2 km/h). Turn the knob to 4HI, A4WD or 2HI. You must wait for the 4HI, A4WD or 2HI indicator light to stop flashing and remain illuminated before shifting your transmission into gear. If the 4HI, A4WD or 2HI knob is turned when your vehicle is in gear and/or moving, the 4HI, A4WD or 2HI indicator light will flash for 30 seconds but will not complete the shift unless your vehicle is moving less than 2 mph (3.2 km/h) with the transmission in NEUTRAL (N). 2-29