P0363

Universal

Misfire Detected - Fueling Disabled

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
High Severity

The engine controller has detected a misfire and disabled fuel delivery as part of its response. A misfiring cylinder may make the engine run roughly or lose power, and continued misfiring can damage the catalytic converter. This code indicates a detected condition, not which part caused it; the exact fueling strategy depends on the vehicle.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the check-engine light is flashing, the engine is shaking badly, power is significantly reduced, or you notice smoke or a strong fuel smell, stop driving when safe and arrange assistance. Continued driving with a severe misfire can cause further damage. Avoid touching hot or moving engine parts.

Common Symptoms

  • Rough idle or engine shaking may occur when one or more cylinders misfire.
  • Reduced power or hesitation may occur if fuel delivery is disabled to a misfiring cylinder.
  • The check-engine light may be on or flashing; a flashing light can indicate a misfire that risks catalytic-converter damage.
  • Fuel economy may worsen while the engine is misfiring or running on fewer cylinders.
  • There may be no obvious symptoms if the condition is intermittent or not currently active.

Common Causes

  • An ignition fault, such as a problem with a spark plug, ignition coil or related connection, may prevent proper combustion.
  • A fuel-delivery problem, including an injector or its electrical connection, may contribute to a misfire or fueling disablement.
  • An intake air leak or another air-fuel mixture problem may interfere with combustion.
  • Low compression or another internal engine condition may prevent a cylinder from firing properly.
  • Damaged wiring, loose connectors or an engine-control issue may affect ignition, fueling or misfire detection.

Diagnostic Steps

  1. Check whether the check-engine light is flashing and note any shaking, power loss, smoke or fuel smell. Stop driving and seek assistance if symptoms are severe.
  2. With the engine off and cool, look for visibly loose or damaged engine wiring and connectors. Do not disconnect components while the engine is running.
  3. Check the vehicle owner's manual for any relevant maintenance or warning information, and record other warning lights or symptoms.
  4. If a suitable scan tool is available, read and record all stored codes before clearing anything. Related codes can help narrow the diagnosis.
  5. Have a qualified technician test the ignition, fuel delivery and engine mechanical condition if the cause is not clear. Do not replace parts based on P0363 alone.

When to Call a Professional

Use a capable scan tool to review related codes and available misfire data, then confirm which cylinder or cylinders are affected if the vehicle reports that information. Check ignition, fuel delivery, wiring and connectors, and engine mechanical condition as indicated by the test results. Confirm that fueling has been restored and the misfire is resolved after repairs; use model-, year- and engine-specific service information for test procedures.

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Commonly Asked Questions

Does P0363 identify a failed part?

No. It reports a detected misfire with fueling disabled, but does not by itself identify the failed component or root cause.

Does this code tell me which cylinder is misfiring?

Not from this code alone. The scan tool may show additional cylinder-specific information or related codes, depending on the vehicle.

Why might the engine controller disable fuel?

The controller may disable fuel as a response to a detected misfire. The exact strategy depends on the vehicle, and the code alone does not show why the misfire occurred.

Can I keep driving with P0363?

Avoid driving if the engine is shaking badly, power is reduced, or the check-engine light is flashing. A severe ongoing misfire can damage the catalytic converter.

Could P0363 appear without a noticeable symptom?

Yes. An intermittent condition may not be obvious at the time you check the vehicle, but the stored code and any related data still need diagnosis.

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