P0300: Random/Multiple Cylinder Misfire Detected
243 vehicles · 30 makes
P0300 is an OBD-II diagnostic trouble code meaning “Random/Multiple Cylinder Misfire Detected.” The engine control module has detected misfires occurring randomly across multiple cylinders. This is the most common OBD-II code and can have many causes. A flashing check engine light with P0300 means active misfires that can damage the catalytic converter. This code appears across 243 vehicle models from 30 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0300, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (243)
FAQ
What does P0300 mean?
P0300 stands for "Random/Multiple Cylinder Misfire Detected." The engine control module has detected misfires occurring randomly across multiple cylinders. This is the most common OBD-II code and can have many causes. A flashing check engine light with P0300 means active misfires that can damage the catalytic converter.
What are the most common causes of P0300?
The most common causes of P0300 are: Worn spark plugs or ignition coils, Vacuum leak, Low fuel pressure, Clogged fuel injectors, EGR valve malfunction, Low compression, Timing chain stretch. The specific cause varies by vehicle.
How much does it cost to fix P0300?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0300?
Au7o has documented P0300 across 243 vehicle models from 30 manufacturers: Acura, Audi, BMW, Cadillac, Chevrolet, Chrysler, Citroën, Dodge, Ford, GMC, Honda, Hyundai, Infiniti, Jaguar, Jeep, Kia, Land Rover, Lexus, MINI, Mazda, Mercedes-Benz, Nissan, Peugeot, Porsche, RAM, Renault, Subaru, Toyota, Volkswagen, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.