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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 43 (2.0L - DTCS P02F1 To P0369) >> DTC Troubleshooting >> P0303 Cylinder 3 Misfire >> Possible Causes

Possible Causes

WARNING: This page is about a different variant/trim than selected.
Possible Causes
ENGINE OIL LEVEL LOW/AERATED OR CONTAMINATED
INCORRECT ENGINE OIL FILTER
ENGINE VACUUM LEAK
FAULTY FUEL INJECTOR
FAULTY IGNITION COIL OR SPARK PLUG
CRANKSHAFT POSITION SENSOR (CKP) OR TONE WHEEL ISSUES
EXCESSIVE CARBON BUILD-UP IN CYLINDER HEAD OR COMBUSTION CHAMBER
COOLANT LEAKING INTO A CYLINDER
FAULTY CYLINDER HEAD GASKET
ENGINE MECHANICAL/LOW COMPRESSION
WORN CAMSHAFT LOBES, SPRINGS OR ROCKER ARMS
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .