P0300 Code: Meaning, Symptoms, Causes & Fixes
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Causes ranked by likelihood
| Cause | Likelihood | DIY difficulty |
|---|---|---|
| Worn spark plugs — First thing to check on any misfire. Plugs over 60k–100k miles are due. | Most likely | 2/5 |
| Failing ignition coils — Often one or two coils fail at a time. Swap to confirm. | Possible | 2/5 |
| Vacuum leak — Lean misfire across cylinders. | Possible | 2/5 |
| Low fuel pressure — Weak pump or clogged filter starves all cylinders. | Less likely | 2/5 |
| Bad fuel injectors — Carbon-clogged injectors cause widespread misfire. | Less likely | 2/5 |
Symptoms of P0300
- Engine shaking
- Loss of power
- Flashing check engine light
- Bad fuel economy
How to diagnose P0300
- Confirm the code. Read P0300 with an OBD-II scanner and note the freeze-frame data (speed, temperature, load) recorded when it set.
- Check for companion codes. Look for other stored or pending codes such as P0301, P0302, P0303, P0304, P0171 — they often point to one shared root cause.
- Check: Vacuum leak. Lean misfire across cylinders.
- Check: Worn spark plugs. First thing to check on any misfire. Plugs over 60k–100k miles are due.
- Check: Failing ignition coils. Often one or two coils fail at a time. Swap to confirm.
- Check: Bad fuel injectors. Carbon-clogged injectors cause widespread misfire.
- Check: Low fuel pressure. Weak pump or clogged filter starves all cylinders.
- Clear and verify. After the repair, clear the code and complete a full drive cycle to confirm P0300 does not return.
Can I drive with P0300?
Avoid driving — sustained misfires dump raw fuel into the catalytic converter and can destroy it within a few hundred miles.
Related codes
Related symptoms
P0300 by vehicle
- P0300 on the Ford F-150
- P0300 on the Ford Escape
- P0300 on the Ford Explorer
- P0300 on the Ford Focus
- P0300 on the Ford Mustang
- P0300 on the Chevrolet Silverado
- P0300 on the Chevrolet Equinox
- P0300 on the Chevrolet Malibu
- P0300 on the Chevrolet Tahoe
- P0300 on the Chevrolet Traverse
- P0300 on the Chevrolet Cruze
- P0300 on the Toyota Camry
- P0300 on the Toyota Corolla
- P0300 on the Toyota RAV4
- P0300 on the Toyota Highlander
- P0300 on the Toyota Tacoma
- P0300 on the Toyota Prius
- P0300 on the Honda Civic
- P0300 on the Honda Accord
- P0300 on the Honda CR-V
- P0300 on the Honda Pilot
- P0300 on the Honda Odyssey
- P0300 on the Nissan Altima
- P0300 on the Nissan Rogue
- P0300 on the Nissan Sentra
- P0300 on the Jeep Grand Cherokee
- P0300 on the Jeep Wrangler
- P0300 on the Jeep Cherokee
- P0300 on the Hyundai Elantra
- P0300 on the Hyundai Sonata
- P0300 on the Hyundai Santa Fe
- P0300 on the Hyundai Tucson
- P0300 on the Kia Forte
- P0300 on the Kia Sorento
- P0300 on the Kia Sportage
- P0300 on the Kia Telluride
- P0300 on the Kia Optima
- P0300 on the Subaru Outback
- P0300 on the Subaru Forester
- P0300 on the GMC Sierra
- P0300 on the GMC Acadia
- P0300 on the Ram 1500
- P0300 on the Dodge Charger
- P0300 on the Volkswagen Jetta
- P0300 on the Mazda CX-5
- P0300 on the BMW 3 Series
- P0300 on the BMW X5
- P0300 on the Mercedes-Benz C-Class
Frequently asked questions
What does P0300 mean?
P0300 means random/multiple cylinder misfire detected. P0300 means your engine is misfiring on multiple cylinders without a clear pattern. Common causes are worn spark plugs, failing ignition coils, low fuel pressure, or vacuum leaks.
Can I drive with code P0300?
Avoid driving — sustained misfires dump raw fuel into the catalytic converter and can destroy it within a few hundred miles.
What is the most common cause of P0300?
Worn spark plugs — First thing to check on any misfire. Plugs over 60k–100k miles are due.
What are the symptoms of P0300?
Engine shaking, Loss of power, Flashing check engine light, Bad fuel economy.
How much does it cost to fix P0300?
A typical shop repair range is $50–$1,200, depending on which cause it turns out to be. Cheaper causes such as bad fuel injectors should be ruled out first.