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 communications
6Original wording in English
FORD
Reported code forms P0308
This article supersedes TSB 25-2200 to update the parts list to add the new camshaft and tappet service kit and add F-650/F-750. Some of the vehicles listed in the Model statement above may exhibit an upper engine…
FORD
Reported code forms P0308
Some of the vehicles listed in the Model statement above may exhibit an upper engine ticking or tapping noise at idle. Customers may also report experiencing rough engine performance, engine misfire, or a malfunction…
FORD, LINCOLN
Reported code forms P0308
MALFUNCTION INDICATOR LAMP ON, WITH P0300 - P0308 MISFIRE DIAGNOSTIC TROUBLE CODES WITH A 4.6L ENGINE. *TT
FORD, LINCOLN
Reported code forms P0308
SYMPTOMS REGARDING P0300-P0308 MISFIRE DTCS WITH 4.6L ENGINES. *YC
FORD, MERCURY
Reported code forms P0308
CONCERNS OF CHECK ENGINE LIGHT (MIL) W/ CODES P0300 THRU P0308 & ENG RUNES ROUGH/MISSES. *TT
FORD, LINCOLN, MERCURY
Reported code forms P0308
CONCERNS OF CHECK ENGINE LIGHT (MIL) W/CODES P0300 THRU P0308 & ENGINE RUNS ROUGH/MISSES MAY BE DUE TO A SPARK PLUG WIRE BOOT THAT IS NOT FULLY SEATED ON THE SPARK PLUG. *TT
Check vehicle applicability
5A 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.