Hybspec

P0300B

Wysoki

Random misfire — BMW diagnostics (N20/N54/N55/B48)

OBD-II (EN): Random Misfire Detected (BMW N20/N54/N55/B48)

Code P0300B — Random misfire — BMW diagnostics (N20/N54/N55/B48). Symptoms: jerking. Possible cause: faulty ignition coils (common N54 defect — coils after 60-80k km). Professional diagnosis recommended.

Symptoms

Jerking, vibrations, flashing check engine light

Possible causes

Faulty ignition coils (common N54 defect — coils after 60-80k km), worn or dirty high-pressure injector (N54/N63), faulty high-pressure fuel pump HPFP (N54)

Affected systems

Silnik spalinowyUkład zapłonowy

Related codes

Universal version

This code has a universal OBD-II form:

P0300Wykryto losowe zapłony w wielu cylindrach

Code P0300B appears in these brands

Go to messages and symptoms for your brand — there we analyze this code together with other typical alerts.

Does code P0300B require professional diagnostics?

The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.