P0302 P0302 OBD-II: Misfire Detected in Cylinder 2

P0302 Severity Moderate

What P0302 means for you

The misfire can lead to performance issues and potential damage if not addressed promptly.

Symptoms

Flashing Check Engine Light
Engine running roughly
Hesitation or jerking during acceleration
In most situations, drivers may not notice significant issues
Some drivers may experience performance problems like stalling at stop signs or rough idling
Misfires or reduced power, particularly when accelerating
Decreased fuel efficiency

Common causes

The engine control module (PCM) identifies that cylinder two is not adequately contributing to engine performance
This detection triggers the P0302 code

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What this code means

The P0302 code indicates that the engine control module has recognized a misfire in cylinder two, which can disrupt the engine's normal operation. This misfire is characterized by a noticeable change in RPM, as the PCM monitors the rotational speed of the crankshaft. If the RPM variance exceeds a certain threshold, the PCM sets this code and activates the Check Engine Light.

How a workshop diagnoses it

1. Use a scan tool to retrieve the P0302 code and any related codes. 2. Check the freeze frame data to understand the conditions under which the code was set. 3. Perform a test drive to replicate the code setting conditions while monitoring engine load, throttle position, RPM, and vehicle speed. 4. If available, examine the misfire counter for cylinder two on the scan tool. 5. If no misfire counter is present, consider switching components like spark plugs or ignition coils to identify the misfire's source.