Jeep WRANGLER 2020 Owner's Manual page 344

342 SERVICING AND MAINTENANCE
ABCD = Code used by the tire manufacturer (one to four digits)
03 = Number representing the week in which the tire was manufactured (two digits)
03 means the 3rd week

01 = Number representing the year in which the tire was manufactured (two digits)
01 means the year 2001

Prior to July 2000, tire manufacturers were only required to have one number to represent the year in which the tire was manufactured. Example:

031 could represent the 3rd week of 1981 or 1991
Tire Terminology And Definitions
Term
B-Pillar
Cold Tire Inflation Pressure
Maximum Inflation Pressure
Recommended Cold Tire Inflation Pressure
Tire Placard
EXAMPLE:
The vehicle B-Pillar is the structural member of the body located behind the front door.
Cold tire inflation pressure is defined as the tire pressure after the vehicle has not been
driven for at least three hours, or driven less than 1 mile (1.6 km) after sitting for a
minimum of three hours. Inflation pressure is measured in units of PSI (pounds per
square inch) or kPa (kilopascals).
The maximum inflation pressure is the maximum permissible cold tire inflation pressure
for this tire. The maximum inflation pressure is molded into the sidewall.
Vehicle manufacturer's recommended cold tire inflation pressure as shown on the tire
placard.
A label permanently attached to the vehicle describing the vehicle's loading capacity,
the original equipment tire sizes and the recommended cold tire inflation pressures.
Definition