What does code P0300 mean on a Dodge and is it safe to drive?
P0300: Random/Multiple Cylinder Misfire Detected. Here's what it means on your Dodge, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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 for your Dodge
- 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
For a Dodge, repairs for P0300 often fall between $150 and $1200, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Dodge
Dodge P0300 on 5.7L and 6.4L Hemi engines with MDS is a known issue—the MDS (Multi-Displacement System) lifter solenoids fail and leave cylinders in deactivated mode, causing P0300. This is diagnosable by checking which cylinders show misfire data with a scan tool. On Dart 1.4T MultiAir, the MultiAir electrohydraulic actuator (oil control valve) can cause P0300 when the OCV for a specific cylinder fails—a MultiAir-specific code often accompanies P0300. On Durango 3.6L Pentastar, coil-on-plug boot seal failure (same as Jeep) is the common cause.
Most commonly affected models