Drive DTCP0300 – Random misfire on more than one cylinder
Random/multiple cylinder misfire detected
Ignition and misfires · generic OBD-II code
Drive it only if you have to, gently and not far. Get it fixed right away.
Check this first
If the check engine light is flashing, stop driving – raw fuel is going into the catalytic converter.
What usually fixes it
In the order a good shop checks them. Typical total: $140–$925 at $130 an hour.
Spark plugs
Worn plugs misfire under load first; they're the usual cause past 60,000 miles.
Ignition coils
A weak coil drops out when it gets hot.
Vacuum leak
A big leak upsets several cylinders at once.
Fuel delivery
Low pressure or dirty injectors starve every cylinder a little.
What the vehicle can tell you itself
A stored code is a headline, not the story. The vehicle also holds the conditions when it happened, how close the part is to the limit it fails at, what the fuel trims are doing, and whether the fault is still happening right now. Drive DTC reads all of it with a USB adapter and a Windows PC – and it can't change a single setting on the vehicle.
See what your vehicle says about P0300
Codes in plain English, what usually causes them, what the repair costs, and whether it's safe to drive.