What causes P0300 on a Ford Ranger?

Common causes of P0300 on Ford Ranger: Ignition coil failure on 2.3L EcoBoost causing single or multiple cylinder misfires; Carbon buildup on intake valves due to direct injection on 2.3L EcoBoost; Spark plug gap erosion from towing or heavy load use on 2.3L turbo; Vacuum leak at PCV hose or intake manifold gasket; Fuel injector spray pattern degradation from deposit buildup.

P0300

P0300 Ford Ranger

Q: How much does it cost to fix P0300 on a Ford Ranger?

Fixes for P0300 on Ford Ranger include: Replace all 4 ignition coils and spark plugs with Motorcraft OE specifications, Perform walnut shell blasting to clean carbon from intake valves, Replace spark plugs with Motorcraft SP-580 at proper 0.028" gap for turbo application, Replace PCV hose and inspect intake manifold gasket for leaks using smoke test, Clean or replace fuel injectors and add BG 44K or equivalent fuel system cleaner.

Random/Multiple Cylinder Misfire Detected · Powertrain Code · High · Repair: Easy

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 Ranger 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 Ranger.

This repair is rated easy, meaning basic tools, no lift needed.

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 Ranger.

Common Causes on Ford Ranger

Ignition coil failure on 2.3L EcoBoost causing single or multiple cylinder misfires
Carbon buildup on intake valves due to direct injection on 2.3L EcoBoost
Spark plug gap erosion from towing or heavy load use on 2.3L turbo
Vacuum leak at PCV hose or intake manifold gasket
Fuel injector spray pattern degradation from deposit buildup

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

Recommended Fixes

Replace all 4 ignition coils and spark plugs with Motorcraft OE specifications

Perform walnut shell blasting to clean carbon from intake valves

Replace spark plugs with Motorcraft SP-580 at proper 0.028" gap for turbo application

Replace PCV hose and inspect intake manifold gasket for leaks using smoke test

Clean or replace fuel injectors and add BG 44K or equivalent fuel system cleaner

Notes for Ford Ranger

The 2.3L EcoBoost in the Ranger shares its engine architecture with the Mustang EcoBoost.

P0300 Ford Ranger

What is P0300?

Common Causes on Ford Ranger

Symptoms

Notes for Ford Ranger

Check Ford Ranger Specs