What does code P0300 mean and is it safe to drive?
P0300: Random/Multiple Cylinder Misfire Detected. Here’s what it means, what usually causes it, what repairs typically cost, and how urgent it is to keep driving.
PowertrainDrive with caution
Repair cost
$150–$1200
System
Powertrain
Urgency
high
What this code means
The PCM has detected misfires across multiple cylinders. This can cause damage to the catalytic converter if driven for long.
Common causes
- Worn spark plugs or ignition coils
- Clogged or bad fuel injectors
- Low compression
- Vacuum leak, bad MAF, or fuel delivery issue
Symptoms
- Check Engine Light (often flashing under load)
- Rough idle, shaking, loss of power
- Possible smell of unburned fuel
Typical fixes
- Replace spark plugs and coils as needed
- Clean or replace fuel injectors
- Fix vacuum/fuel issues
- Compression test if no obvious cause
Repair cost range
Repairs for P0300 often fall between $150 and $1200, depending on the cause and your vehicle.