Reading
No make or model yet. The reading below is the shared meaning, not a note about one car.
The first look at a new code takes a moment. We open public pages and keep only what they say. We do not guess.
That is the reading. Another code?
P0300
Stop if the light is flashingThe engine skipped on more than one cylinder, or the car could not say which cylinder skipped.
A flashing check-engine light means the engine is skipping badly. Slow down and get help. Driving on can damage the part that cleans the exhaust.
Shared powertrain name. A brand-owned code on the same car can mean something else.
A shop will typically identify which cylinders are misfiring and check ignition, fueling, and mechanical compression before replacing parts.