Meaning
What P0302 usually means
P0302 points to cylinder 2 as the main source of the misfire pattern. It is usually diagnosed the same way as other single-cylinder misfire faults: confirm ignition first, then fuel and mechanical health.
DTC code page
P0302: Cylinder 2 Misfire Detected
Quick answer: The ECU detected misfire events concentrated in cylinder 2.
Drivers also search this fault as cylinder 2 misfire, misfire cylinder 2, number 2 cylinder misfire.
Severity: high Family: powertrain Related paths: 6
Fast triage
Start here before chasing parts
- Scan first: save freeze-frame and pending codes before clearing anything.
- Confirm the complaint: compare the stored code with current drivability symptoms.
- Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
- Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks
What to check first
- Check cylinder 2 ignition components first because they are usually fastest to verify.
- Inspect wiring and connector retention if recent engine work has been done.
Driving risk
Can you keep driving?
Treat P0302 like any active misfire: short-term only if mild, not if the engine is flashing the MIL or bucking under load.
High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Symptoms
Common symptoms
- Engine Misfire
- Check Engine Light Flashing
- rough running
- shake at idle
- hesitation
Likely causes
Common causes behind this code
- Plug or coil fault on cylinder 2
- Injector imbalance or restricted fuel delivery
- Mechanical issue such as low compression
- Wiring fault affecting cylinder 2 ignition or injection
Cause phrases often tied to this code: spark plug, ignition coil, injector imbalance, low compression, wiring fault.
Diagnostic order
Suggested workflow
- Check cylinder 2 ignition components first because they are usually quickest to verify.
- Review live misfire counters if your scan tool supports them.
- Test injector operation and confirm compression if the ignition side looks normal.
Avoid guesswork
Common mistakes
- Jumping to injector replacement before a quick coil or plug swap test.
- Ignoring harness damage around the coil or injector connector.
Repair path
Practical fix guidance
- Replace or repair the proven failed part, then verify that cylinder 2 misfire counts stay at zero under load.
- If compression is low, move the repair plan toward mechanical diagnosis instead of continuing parts-swapping.
Vehicle context
Affected brands in this MVP
Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.
Aliases and common searches
English phrases tied to P0302
Useful when the driver knows the wording but not the exact DTC yet.
- cylinder 2 misfire
- misfire cylinder 2
- number 2 cylinder misfire
Related search intent
Queries this page can answer naturally
- P0302 code meaning
- what does P0302 mean
- cylinder 2 not firing
FAQ
Quick questions about P0302
Can a vacuum leak cause P0302?
Sometimes indirectly, but single-cylinder misfire more often points to that cylinder's ignition, fuel, or compression.
Connected paths
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