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
21Original wording in English
CADILLAC, CHEVROLET, GMC
Reported code forms P0300
This Preliminary information communicates A vehicle may have a concern of DTC P050D setting along with a P0300 after a cold start up. White smoke and/or coolant odor may come from exhaust for an extended period of time…
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
CADILLAC, CHEVROLET, GMC
Reported code forms P0300
This Preliminary Information communication provides information to the technician about vehicles that may have a Service Engine Soon Malfunction Indicator Lamp on and Diagnostic Trouble Code P0300 - P0308 may set.…
BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC, SAAB
Reported code forms P0300
This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on, engine misfire, and/or engine noise. Technician may find…
CHEVROLET, GMC
Reported code forms P0300
This Preliminary information communicates to the dealer technicians that DTC P0300 with engine misfires on paired cylinders may be caused by an internal ECM fault.
BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC, SAAB
Reported code forms P0300
This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on, engine misfire, and/or engine noise. Technician may find…
Check vehicle applicability
19A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| GMC | SIERRA | 2017 |
| GMC | SIERRA | 2013 |
| GMC | SIERRA | 2012 |
| GMC | SIERRA | 2011 |
| GMC | SIERRA | 2010 |
| GMC | SIERRA | 2009 |
| GMC | SIERRA | 2008 |
| GMC | SIERRA | 2007 |
| GMC | SIERRA | 2006 |
| GMC | SIERRA | 2005 |
| GMC | SIERRA | 2004 |
| GMC | SIERRA | 2003 |
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.