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
KIA
Reported code forms P0300
TSB - SERVICE ACTION: SPARK PLUG REPLACEMENT (SA342) - This bulletin provides the procedure to replace the spark plugs on some 2018MY Forte (YDm), produced from November 21, 2017 through April 12, 2018, and 2018MY Rio…
KIA
Reported code forms P0300
KIA: COMBINED TSB/SERVICE ACTION ECM UPGRADE FOR MULTIPLE DTC'S LISTED-P0300, P0128, P0140, P0451, P0461. PROVIDES THE PROCEDURE TO UPGRADE THE ENGINE CONTROL MODULE (ECM) OF SOME VEHICLES (MAP SENSORS ONLY) WHICH MAY…
KIA
Reported code forms P0300
KIA: ECM UPGRADE-MIL ON WITH DTC P0300, P0128, P0140, P0442 & P0461. VEHICLES MAY EXPERIENCE A ROUGH IDLE DURING INITIAL COLD START UP PERIOD AND/OR ILLUMINATE THE MIL. *PE UPDATED 10/29/10. *PE
KIA
Reported code forms P0300
KIA: ECM UPGRADE FOR MULTIPLE DTC'S LISTED, P0300, P0128, P0140, P0442, P0451, P0461 (SA032). PROVIDES PROCEDURE TO UPGRADE THE ENGINE CONTROL MODULE (ECM) OF SOME 1.6L VEHICLES PRODUCED 7/17/08-7/11/09 (MAP SENSOR…
KIA
Reported code forms P0300
POWERTRAIN CONTROL MODULE (PCM) REPROGRAM - ROUGH IDLE DURING INITIAL COLD START/DTC P0300. *KB
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.