2006 Hummer H3 Owner's Manual - Page 101

{CAUTION: With all-wheel drive, your vehicle will be free to roll - even if your shift lever is in PARK (P) - if your transfer case is in NEUTRAL. So, be sure the transfer case is in a drive gear, four-wheel high (4H) or four-wheel low (4L) - not in NEUTRAL. 2. Move the shift lever into PARK (P) by pressing the shift lever button and moving the lever as far forward as it will go. 3. Turn the ignition key to LOCK. 4. Remove the key and take it with you. If you can leave your vehicle with the key, your vehicle is in PARK (P). Leaving Your Vehicle With the Engine Running (Automatic Transmission) {CAUTION: It can be dangerous to leave your vehicle with the engine running. Your vehicle could move suddenly if the shift lever is not fully in PARK (P) with the parking brake firmly set. And, if you leave the vehicle with the engine running, it could overheat and even catch fire. You or others could be injured. Do not leave your vehicle with the engine running. If you have to leave your vehicle with the engine running, be sure your vehicle is in PARK (P) and your parking brake is firmly set before you leave it. After you have moved the shift lever into PARK (P), hold the regular brake pedal down. Then, see if you can move the shift lever away from PARK (P) without first pressing the shift lever button. If you can, it means that the shift lever was not fully locked into PARK (P). 2-29