P0300 Possible Causes
- Faulty spark plug (s)
- Faulty ignition coil (s)
- Clogged or faulty fuel injector (s)
- Intake air leak
- Fuel injectors harness is open or shorted
- Fuel Injectors circuit poor electrical connection
- Ignition coils harness is open or shorted
- Ignition coils circuit poor electrical connection
- Insufficient cylinders compression
- Incorrect fuel pressure
How is the P0300 code repair?
Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.Tech Notes
The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes".User Submitted Video
What is the cost to diagnose the P0300 code
Labor: 1.0
The cost to diagnose the P0300 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0300 Meaning
The Engine Control Module (ECM) uses information from the crankshaft position sensor and the camshaft position sensor to determine when an engine cylinder misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM can detect individual cylinder misfire events.Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present. The Diagnostic Trouble Codes (DTC) P0301 through P0306 (or P0301 through P0308) correspond to cylinders 1 through 6 (or 1 through 8). When the ECM detects that one or more specific cylinders are misfiring, the DTC for the respective misfiring cylinder will set, and up to 2 of the corresponding fuel injectors are disabled for a minimum of 30 s. The ECM will then re-enable the fuel injector and, after approximately 200 engine revolutions, will determine if the misfire is still present. If the misfire is still present, the ECM will disable the fuel injector again repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM. In Spark Ignition Direct Injection (SIDI) system applications, if a fuel injector fault DTC is set during a misfire event, the ECM will not re-enable the injector.
More Information
Need more information on how to fix the P0300 code?Get Access to Factory Service Manuals
Information for specific makes
- P0300 ACURA Random Cylinder Misfire Detected
- P0300 AUDI Random Cylinder Misfire Detected
- P0300 BMW Combustion Misfires Several Cylinders
- P0300 BUICK Cylinder Misfire Detected Random Cylinders ▶
- P0300 CADILLAC Cylinder Misfire Detected Random Cylinders ▶
- P0300 CHEVROLET Cylinder Misfire Detected Random Cylinders ▶
- P0300 CHRYSLER Cylinder Misfire Fault Detected Random Cylinders
- P0300 DODGE Cylinder Misfire Fault Detected Random Cylinders ▶
- P0300 FORD Random Misfire Detected ▶
- P0300 GMC Cylinder Misfire Detected Random Cylinders ▶
- P0300 HONDA Random Cylinder Misfire Detected
- P0300 HUMMER Cylinder Misfire Detected Random Cylinders ▶
- P0300 HYUNDAI Random/Multiple Cylinder Misfire Detected ▶
- P0300 INFINITI Cylinder Misfire Detected Random Cylinders
- P0300 JEEP Cylinder Misfire Fault Detected Random Cylinders
- P0300 KIA Random/Multiple Cylinder Misfire Detected
- P0300 LEXUS Random Cylinder Misfire Condition
- P0300 LINCOLN Random Misfire Detected
- P0300 MAZDA Random Cylinder Misfire Detected
- P0300 MERCEDES-BENZ Cylinder Misfire Detected Random Cylinders
- P0300 MERCURY Random Misfire Detected
- P0300 MINI Combustion Misfires Several Cylinders
- P0300 MITSUBISHI Cylinder Misfire Detected Random Cylinders
- P0300 NISSAN Cylinder Misfire Detected Random Cylinders ▶
- P0300 OLDSMOBILE Cylinder Misfire Detected Random Cylinders ▶
- P0300 PONTIAC Cylinder Misfire Detected Random Cylinders
- P0300 RAM Cylinder Misfire Fault Detected Random Cylinders ▶
- P0300 SATURN Cylinder Misfire Detected Random Cylinders
- P0300 SCION Random Cylinder Misfire Condition
- P0300 SUBARU Random Cylinder Misfire Detected
- P0300 SUZUKI Cylinder Misfire Detected Random Cylinders
- P0300 TOYOTA Random Cylinder Misfire Condition ▶
- P0300 VOLKSWAGEN Random Cylinder Misfire Detected