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P0300

Overview

Code

P0300

Code Type

P

Code Class

P0

System

Engine

Severity Level

High

Emissions Related

true

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0300 indicates random or multiple cylinder misfires detected by the ECM

Symptoms

Check Engine Light flashing or illuminated; Engine shaking; Loss of power

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Misfires affect engine power, emissions, and catalytic converter health

Possible Causes

Worn spark plugs; Ignition coil failure; Fuel delivery issues

Diagnostic Steps

1 Confirm misfire data; 2 Inspect ignition components; 3 Check fuel injectors; 4 Perform compression test if needed

Drive Safety Notes

Driving with misfires may damage the catalytic converter Repairs should be performed immediately

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