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P0301

Overview

Code

P0301

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 P0301 indicates a misfire detected in cylinder 1

Symptoms

Rough running engine; 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

Cylinder-specific misfires affect engine balance and emissions

Possible Causes

Faulty spark plug; Ignition coil failure; Fuel injector issues

Diagnostic Steps

1 Confirm cylinder 1 misfire; 2 Inspect spark plug and coil; 3 Check injector operation

Drive Safety Notes

Continued driving may damage the catalytic converter

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