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
BUICK, CADILLAC, CHEVROLET, GMC, HUMMER, ISUZU, OLDSMOBILE, PONTIAC, SAAB, SATURN
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
BUICK, CADILLAC, CHEVROLET, GMC, HUMMER, ISUZU, OLDSMOBILE, PONTIAC, SAAB, SATURN
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
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
BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC, SATURN
Reported code forms P0300
This Preliminary Information communication provides information to the technician about vehicles that have an intermittent engine misfire and a Service Engine Soon Malfunction Indicator Lamp. Technician may find…
CHEVROLET
Reported code forms P0300
1.6L L91 INTERMITTENT MISFIRE COLD DURING DECELERATION OR STEADY STATE HIGHWAY DRIVING AFTER COLD START WITH DTC'S P0300, P0700, P1781 AND/OR U0401 SET (REPLACE VALVES AND VALVE STEM SEALS) *TT UPDATED 11/02/07 *NJ
CHEVROLET
Reported code forms P0300
SERVICE ENGINE SOON LIGHT AND ROUGH RUNNING WITH DIAGNOSTIC TROUBLE CODES P0700, P1781 AND POSSIBLY A P0300. *TT
Check vehicle applicability
14A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Chevrolet | AVEO | 2018 |
| Chevrolet | AVEO | 2017 |
| Chevrolet | AVEO | 2016 |
| Chevrolet | AVEO | 2015 |
| Chevrolet | AVEO | 2014 |
| Chevrolet | AVEO | 2013 |
| Chevrolet | AVEO | 2012 |
| Chevrolet | AVEO | 2011 |
| Chevrolet | AVEO | 2010 |
| Chevrolet | AVEO | 2009 |
| Chevrolet | AVEO | 2007 |
| Chevrolet | AVEO | 2006 |
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.