P0300 Ford Bronco Sport
Random/Multiple Cylinder Misfire Detected · Powertrain Code · High · Repair: Moderate
What is P0300?
The ECM has detected misfires occurring in multiple or random cylinders. Common causes include worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, or a failing catalytic converter.
When the Ford Bronco Sport triggers code P0300 (random/multiple cylinder misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Ford Bronco Sport.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford Bronco Sport.
Common Causes on Ford Bronco Sport
- Ignition coil pack failure on 1.5L EcoBoost three-cylinder (Escape/Bronco Sport)
- Spark plug fouling from coolant intrusion due to cracked cylinder head on 1.5L EcoBoost (TSB)
- Carbon deposits on intake valves from GDI system on 2.0L EcoBoost
- Low fuel pressure from weak fuel pump on 1.5L EcoBoost under high load
- Turbo inlet pipe seal leak causing unmetered air and lean misfires
Symptoms
- Rough idle with noticeable engine vibration
- Engine shaking or stumbling under load
- Loss of power during acceleration
- Check engine light flashing intermittently
- Poor fuel economy
- Hesitation or stumble on acceleration
Notes for Ford Bronco Sport
The 1.5L EcoBoost three-cylinder has a known coolant intrusion issue that can cause misfires and engine failure.