Part of the generic P0303 overview — this page covers the Jeep meaning specifically.
OBD-II Diagnostic Trouble Code
P0303
Misfire No.3 cylinder
P
Powertrain
engine / trans
engine / trans
0
Generic
SAE standard
SAE standard
3
Ignition / misfire
03
Misfire No.3 cylinder
Severity · general guide
High
Misfire — address promptly
Code type
Jeep
System
Powertrain
Model
Grand Cherokee
Years
2011