What does code P0300 mean on a Acura and is it safe to drive?
P0300: Random/Multiple Cylinder Misfire Detected. Here's what it means on your Acura, 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 Acura
- 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 Acura, 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 Acura
Acura P0300 on J35/J37 V6 engines is most often caused by a melted ignition coil harness connector—the coil connectors on the rear bank (cylinders 4–6) are near the firewall and corrode or melt from heat cycling. Inspect all six connectors for cracked or melted plastic before replacing coils. On RDX 2.3T K23A1, P0300 under boost is usually a boost leak from the intercooler hose couplers. On MDX with SH-AWD, ensure the rear differential oil cooler isn't contributing excess heat to the transmission tunnel area near the coil connectors.
Most commonly affected models