P0496: Evaporative Emission System High Purge Flow
The purge valve is letting vapor flow when it shouldn't, usually because it's stuck open.
Green, yellow, red: three ways P0496 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Light on, drives normally.
Schedule a repair
Hard starts or stumbling after fueling. Replace the purge valve soon.
Stop and get help
Stalling at idle or in traffic. Don't drive until fixed.
Symptoms you might notice
- Rough idle
- Hard start after fueling
- Possible stall
Common causes, cheapest first
- Purge valve stuck open (most common)
- Wiring keeping the valve on
What you can check before calling
- Notice stumbles after filling up
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: Check engine light after getting gas? Gas caps and EVAP codes.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
More evap (fuel vapor) codes
- P0440
Evaporative Emission System Malfunction - P0442
Evaporative Emission System Leak Detected (Small Leak) - P0446
Evaporative Emission System Vent Control Circuit Malfunction - P0449
Evaporative Emission System Vent Valve/Solenoid Circuit Malfunction - P0455
Evaporative Emission System Leak Detected (Large Leak) - P0456
Evaporative Emission System Leak Detected (Very Small Leak)
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0496 mean?
P0496 means "Evaporative Emission System High Purge Flow". The purge valve is letting vapor flow when it shouldn't, usually because it's stuck open.
Can I drive with code P0496?
It depends on what the vehicle is doing. Green: Light on, drives normally. Yellow: Hard starts or stumbling after fueling. Replace the purge valve soon. Red: Stalling at idle or in traffic. Don't drive until fixed.
What causes P0496?
The most common causes are: purge valve stuck open (most common); wiring keeping the valve on.
Is P0496 a serious code?
It can be. Stalling at idle or in traffic. Don't drive until fixed.
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