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
5Original wording in English
BUICK, CADILLAC, CHEVROLET, GMC, HUMMER, ISUZU, OLDSMOBILE, PONTIAC, SAAB, SATURN, SUZUKI
Reported code forms P0300
This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
ISUZU
Reported code forms P0300
VARIOUS DRIVEABILITY SYMPTOMS DUE TO CLOGGED FUEL INJECTORS, MIL DTC'S P0171, P0172, P0174, P0300, P1174, AND P1175. *KB UPDATED 08-03-07. *KB
ISUZU
Reported code forms P0300
4.2L LL8 ENGINE - FLASHING AND/OR MIL LIGHT, ROUGH IDLE, MISFIRES DTC'S P0300, P0301, P0302, P0303, P0304, P0305, P0306. *KB
ISUZU
Reported code forms P0300
MALFUNCTION INDICATOR LAMP (MIL) ON/DIAGNOSTIC TROUBLE CODE(S) (DTC) P0300, P0171 AND P0174, MISFIRE DUE TO FUEL INJECTOR CONNECTORS CROSSED/SWAPPED/INCORRECTLY INSTALLED. *TT
ISUZU
Reported code forms P0300
SERVICE ENGINE SOON/CHECK ENGINE LIGHT ILLUMINATED, MISFIRE OR ROUGHNESS, DIAGNOSTIC TROUBLE CODE P0300 SET. *TT
Check vehicle applicability
7A 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.