What does this code mean?
P0300 indicates random or multiple-cylinder misfire. P0301–P0308 identify the numbered cylinder. Ignition, fuel delivery, compression, air leaks or mechanical timing can cause misfire. Use misfire counters, freeze-frame data and appropriate tests to narrow the cause. A flashing malfunction light can signal a misfire that may damage the catalyst.
Sources and interpretation [1]
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0306Cylinder 6 MisfireP0306-00Cylinder 6 Misfire.** NOTE: **The aboveManufacturer communications
10Original wording in English
DODGE
Reported code forms P0306-00
Flash: Ignition System Control Module (ISCM) Updates PCR9A Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic…
DODGE, JEEP
Reported code forms P0306
6.4L Fuel Injector High Flow Misfire This bulletin involves inspecting the Julian date on the fuel rails, fuel injectorsand possibly replacing fuel injectors. Customers may experience a Malfunction Indicator Lamp (MIL)…
CHRYSLER, DODGE
Reported code forms P0306
Flash: Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. A small number of customers may experience one or more of…
CHRYSLER, DODGE
Reported code forms P0306
Flash: Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. A small number of customers may experience one or more of…
CHRYSLER, DODGE, JEEP
Reported code forms P0306
MIL Illumination: P0300, P0302, P0304 or P0306 (X56 Warranty Extension) This bulletin involves checking for excessive cylinder leakage and replacing the cylinder head if necessary. Customers may experience a Malfunction…
CHRYSLER, DODGE, JEEP
Reported code forms P0306
MIL Illumination: P0300, P0302, P0304 or P0306 (X56 Warranty Extension) This bulletin involves checking for excessive cylinder leakage and replacing the cylinder head if necessary. Customers may experience a Malfunction…
Check vehicle applicability
6A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Sources and interpretation
These explanations are editorial summaries of the linked manufacturer material. PDF page numbers count from the first file page. Original publications are in English; translations are reference aids. A cited edition is not a claim that it is the manufacturer's latest instruction.
- 01 13 14 / 2033805 · Engine, Misfire Diagnostic Aid ↗
Volkswagen Group of America · PDF page(s) 1, 2 ·
- 2024–2025 MY OBD System Operation Summary for Gasoline Engines ↗
Ford Motor Company · PDF page(s) 9, 10 ·
Source check date · 2026-10-27
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.