P0300 Toyota Camry
Random/Multiple Cylinder Misfire Detected · Powertrain Code · High · Repair: Easy
What is P0300?
The ECM has detected misfires occurring in multiple or random cylinders. Common causes include worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, or a failing catalytic converter.
When the Toyota Camry triggers code P0300 (random/multiple cylinder misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Toyota Camry.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Toyota Camry.
Common Causes on Toyota Camry
- Ignition coil failure on 2.5L Dynamic Force or 2.0L four-cylinder (Camry/Corolla)
- Spark plug wear at extended 120k-mile interval causing widened gap and weak spark
- EGR cooler deposit buildup causing combustion irregularities on 2.5L engine
- Fuel injector tip carbon deposits from direct injection (DI models 2018+)
- Intake manifold runner control valve sticking on port/direct injection combo engines
Symptoms
- Rough idle with noticeable engine vibration
- Engine shaking or stumbling under load
- Loss of power during acceleration
- Check engine light flashing intermittently
- Poor fuel economy
- Hesitation or stumble on acceleration
Notes for Toyota Camry
Toyota dual-injection (D-4S) engines are less prone to carbon buildup than pure GDI designs.