P0306
Cylinder 6 Misfire Detected
2003-2003 Jeep Wrangler 2.4L I4
High SeverityPowertrainGeneric (SAE)
The 2003 Jeep Wrangler is equipped with a 2.4L inline-4 engine. Below you'll find detailed p0306 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Misfire detected in cylinder 6.
Symptoms
- Check Engine Light
- Rough idle
- Loss of power
Common Causes
- Worn spark plug #6
- Faulty ignition coil #6
- Faulty injector #6
- Low compression cyl 6
Diagnostic Steps
- Swap coil #6
- Inspect plug #6
- Test injector #6
- Check compression
Repair Notes
Swap coil to diagnose.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0306 on Other Vehicles
Common Questions
What does code P0306 mean on a 2003-2003 Jeep Wrangler?
P0306 stands for "Cylinder 6 Misfire Detected". Misfire detected in cylinder 6.
What are the symptoms of P0306 on a Jeep Wrangler?
Common symptoms of P0306 include: Check Engine Light, Rough idle, Loss of power.
What causes P0306 on a 2003-2003 Jeep Wrangler?
Common causes of P0306 include: Worn spark plug #6, Faulty ignition coil #6, Faulty injector #6, Low compression cyl 6.
Last updated: March 2026