P1399high severityPowertrain
Random Misfire Detected
on 2016 Honda Civic 1.5L I4 Turbo · FWD
What this code means
The ECM detected misfires across multiple cylinders with no single cylinder identified. Equivalent to OBD generic P0300 random misfire.
Symptoms
- Rough idle
- Engine shaking or stumbling
- Loss of power
Common causes
- Worn spark plugs
- Faulty ignition coils
- Vacuum or intake leak
- Fuel delivery problem
Diagnostic steps
- Scan and confirm P1399 with misfire counts
- Inspect spark plugs and coils
- Check for vacuum and intake leaks
- Test fuel pressure and injectors
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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