1998 GMC Suburban Owner's Manual - Page 105

Leaving Your Vehicle With the Engine Running It canbe dangerous to leave your vehicle with the engine running. Your vehicle could move suddenly if the shift lever is not fullyPARK (P) in with the parking brake firmly If you have set. four-wheel drive and your transfer case is in NEUTRAL (N), your vehicle will be free to roll, even if your shift lever in PARK (P). So be sure is the transfer case is in a drive gear in not NEUTRAL (N). And, if you leave the vehicle with the engine running, it could overheat and even catch fire.You or otherscould be injured. Don't leave your vehicle with the engine running unless you have to. If you have to leave your vehicle with the engine running, be sure your vehicle is i n PARK (P) and the parking brake is firmly set before you leave it. After you move the shift lever into PARK (P), hold the regular brake pedal down. Then, seeif you can move the shift lever away from PARK (P) without first pulling it toward you. If you can, it means that the shift lever wasn't f ~ ~ l locked into PARK (P). ly Torque Lock If you are parking on a hill and yo11don't shift your transmission into PARK (P) properly, the weight of the vehicle may put too much force on the parking pawl in the transmission. You may find it difficult to pull the shift lever out of PARK (P). This is called "torque lock." To prevent torque lock, set the parking brake and then shift into PARK (P) properly before you leave the driver's seat. To find out how, see "Shifting Into PARK (P)" in the Index. When you are ready to drive, move the shift lever out of PARK (P) h