Meaning
What P0300 Means
P0300 means the engine computer detected random or multiple-cylinder misfires.
OBD code guide
P0300 Code Meaning & Repair Cost
P0300 means the engine computer detected random or multiple-cylinder misfires.
Meaning Common causes Repair costs
Can I drive?
Driving Guidance
Use this as planning guidance. If the car misfires, stalls, overheats, or the light flashes, get help quickly.
Causes and symptoms
Common Causes and Symptoms
Codes are clues, not final diagnosis.
Spark plug wear
A mechanic should confirm this before replacing parts.
Ignition coil failure
A mechanic should confirm this before replacing parts.
Vacuum leak
A mechanic should confirm this before replacing parts.
Fuel delivery issue
A mechanic should confirm this before replacing parts.
Rough idle
A mechanic should confirm this before replacing parts.
Engine shaking
A mechanic should confirm this before replacing parts.
Related repairs
Estimated Repair Costs
Open related repair pages to compare parts and labor before approving work.
FAQ
P0300 questions
P0300 means the engine computer detected random or multiple-cylinder misfires.
The broad planning range is $120-$1,100, depending on the confirmed part and labor time.
If the vehicle runs poorly, overheats, misfires, or the check engine light flashes, avoid driving and get inspection quickly.
Yes. Clearing a code does not repair the root cause. If the fault remains, the code usually returns.
Compare diagnostic fee, parts brand, labor hours, warranty, and whether related causes were inspected.