P0303high severityPowertrain
Cylinder 3 Misfire Detected
on 2003 Cadillac DeVille 4.6L V8 Northstar · FWD
What this code means
Misfire detected in cylinder 3.
Symptoms
- Check Engine Light
- Rough idle
- Vibration
- Loss of power
Common causes
- Worn spark plug #3
- Faulty ignition coil #3
- Faulty injector #3
- Low compression cyl 3
Diagnostic steps
- Swap coil #3
- Inspect spark plug #3
- Test injector #3
- Check compression
Repair notes
Swap coil to diagnose.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1