What does code P0300 mean on a Infiniti and is it safe to drive?
P0300: Random/Multiple Cylinder Misfire Detected. Here's what it means on your Infiniti, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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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 Infiniti
- 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 Infiniti, 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 Infiniti
Infiniti VQ35/VQ37 P0300 is commonly associated with timing chain stretch on higher-mileage models. Rattling at cold startup combined with P0300 is a strong indicator; ignition coils and spark plugs should still be ruled out first.
Most commonly affected models
G35 2003–2007G37 2008–2013FX35 2003–2008