Misfire Detected - Fueling Disabled
P0363 indicates that the powertrain control module (PCM) has detected a misfire severe enough to disable fuel injection to the affected cylinder(s) to prevent catalytic converter damage. This typically occurs when misfire counts exceed a threshold, often due to ignition, fuel, or mechanical issues. The PCM cuts fuel to protect the catalytic converter from unburned fuel, which can cause overheating and failure.
01. Most Common Causes
- Faulty spark plugs or ignition coils
- Fuel injector issues (clogged, leaking, or electrical)
- Low fuel pressure or fuel pump failure
- Vacuum leaks or intake manifold gasket leaks
- Internal engine mechanical problems (low compression, valve issues)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire, rough idle, or hesitation
- Reduced engine power and poor acceleration
- Possible fuel smell from exhaust
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes (e.g., P0300-P0306) to identify misfiring cylinder(s).
Step 2: Inspect spark plugs and ignition coils for wear or damage; replace as needed.
Step 3: Check fuel pressure and injector operation; clean or replace injectors if necessary.
Step 4: Perform a compression test to rule out mechanical issues like low compression or valve problems.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with P0363 can cause catalytic converter damage due to unburned fuel. It's best to have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Costs vary: spark plugs/coils ($50-$150), fuel injectors ($100-$400), or more for internal engine repairs. Diagnostic fees are typically $100-$150.