* Specific tire size: Your Jeep's tires are identified by a code like P245/70R16 or something similar, found on the sidewall of your tire. Different size tires require different pressures.
* Load: How much weight is in your vehicle? A heavier load requires higher pressure.
* Tire condition: Older or damaged tires may require slightly different pressures.
Where to find the correct information:
1. The sticker on your driver's side doorjamb: This sticker lists the recommended tire pressure for your specific vehicle configuration. This is the most important source of information. It will specify the pressure for both front and rear tires.
2. The sidewall of your tires: The maximum pressure for your tires is printed on the sidewall. Never exceed this maximum. The sticker on your doorjamb will usually recommend a pressure *below* this maximum.
3. Your owner's manual: The owner's manual will also provide guidance on tire pressures, though the doorjamb sticker is usually the most up-to-date.
In short: Do not guess. Check the sticker on your driver's side doorjamb. That's the best and most reliable source for your 2003 Jeep Grand Cherokee's proper tire pressure.
