P0363: Misfire Detected - Fueling Disabled
Severe misfire detected — the PCM has disabled fuel injection on the affected cylinder(s) to protect the catalyst from raw fuel. Common protective response on heavy or sustained misfire conditions.
What P0363 means
P0363 is a generic OBD-II powertrain code in the misfire & ignition group. In plain English: the engine computer counted combustion events that didn’t fire properly.
- Check engine light
- Usually on
- Emissions-related
- Yes — can fail inspection
- Limp mode possible
- Yes
- Drive cycle to clear
- Not required
Get it fixed
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Symptoms
- Check engine light on or flashing
- Rough idle and uneven running
- Power loss, hesitation under acceleration
- Increased fuel consumption
- Possible smell of unburned fuel from exhaust
Common causes
- 01Severe misfire — read companion P030x codesMost likely
Can I drive with P0363?
Only gently, and not if the light is flashing.
A flashing check engine light means an active misfire that is dumping unburned fuel into the exhaust. Stop driving and have it towed or repaired; continuing can melt the catalytic converter.
Why we rate it urgent
- Misfires can overheat and ruin the catalytic converter
- Can put the vehicle in limp mode (reduced power)
- Turns on the check engine light
- Emissions-related: will usually fail an OBD inspection
Severity is our rule-based rating from the code’s flags in OBDex and the system it affects, not an inspection of your car. If the check engine light is flashing, or you notice overheating, low oil pressure, or brake or steering problems, stop driving and get help.
How to diagnose P0363
- 1
Confirm the code and save freeze-frame data
Read the codes with an OBD-II scan tool and note every code, not just P0363. Save the freeze-frame data (speed, load, temperature when the fault set) before clearing anything; it tells you when the fault happens.
- 2
Fix other faults first
If other codes are stored, start with power-supply, sensor-circuit and communication codes. They can cause this code as a side effect.
- 3
Find the misfiring cylinder
Use the scan tool's misfire counters to see which cylinders misfire. Swap the ignition coil (or plug) from a misfiring cylinder to another one: if the misfire follows the part, you found it. Check for vacuum leaks and fuel trim if all cylinders misfire.
- 4
Test the likely causes in order
Start with the most likely cause and work down: Severe misfire — read companion P030x codes. Test before replacing parts.
- 5
Check for recalls and service bulletins
Look up recalls for your exact vehicle with its VIN, and ask a dealer about technical service bulletins (TSBs). Manufacturers sometimes issue software updates or extended warranties for known faults.
- 6
Clear the code and verify the repair
After the repair, clear the code and drive the car under the conditions in the freeze-frame data to confirm it does not return.
P0363 repair cost estimate
Estimate, not a quote. Labor times are typical ranges for this code from OBDex, and $125/hr is an assumed rate. Shop rates and labor times vary by vehicle and region. Diagnosis time may be billed separately.
- DIY difficulty
- Hard
- Good DIY job?
- Usually a shop job
Involved testing or major parts. Most owners use a shop.
Parts and systems involved
- Fuel injector
- Ignition coil
- Powertrain control module
P0363 FAQ
What does P0363 mean?
P0363 means “Misfire Detected - Fueling Disabled”. Severe misfire detected — the PCM has disabled fuel injection on the affected cylinder(s) to protect the catalyst from raw fuel. Common protective response on heavy or sustained misfire conditions.
Is P0363 serious? Can I keep driving?
We rate P0363 as urgent severity. Only gently, and not if the light is flashing. A flashing check engine light means an active misfire that is dumping unburned fuel into the exhaust. Stop driving and have it towed or repaired; continuing can melt the catalytic converter.
What causes P0363?
The most common causes, from most to least likely: Severe misfire — read companion P030x codes. Test before replacing parts, because several causes can set the same code.
How much does it cost to fix P0363?
Typical labor is about $125–$750 at an assumed $125/hour shop rate, plus parts. That is an estimate, not a quote: labor times and rates vary by vehicle and region, and diagnosis may be billed separately.
Can I fix P0363 myself?
DIY difficulty is hard. Most owners leave this to a shop because it needs involved testing or specialist tools. Always confirm the cause before buying parts.
Will P0363 clear itself?
If the fault was intermittent, the warning may go off once the computer stops seeing it, but the code stays in memory. Fix the cause; clearing the code alone doesn’t repair anything.