P0496 code meaning
EVAP System High Purge Flow
Powertrain system Generic code P04xx codes Check engine light
What P0496 means
The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. P0496 means vapour flows into the intake although the module is not purging – usually a purge valve that leaks or sticks open. GM and Saab seal the system after a cold start with the engine running; if tank vacuum exceeds 2491 Pa for 5 s, the code sets (fuel 10–90 %, MIL after two trips). Ford, which replaced its old code P1450 with P0496, also sets it for excessive vacuum during the leak test, for example with a vent valve stuck closed. Hard starting right after refuelling is typical.
P0496 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0496
- Check engine light on
- Hard or long starting right after refuelling
- Rough idle, rich fuel trim
- Hissing vacuum when opening the fuel cap
Common causes of P0496
- Most likelyPurge valve leaking or stuck open (charcoal dust in the seat)
- PossibleVent valve stuck closed or vent filter or line blocked
- Less likelyVapour line kinked or blocked
- Less likelyTank pressure sensor reading wrong
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP purge valveEVAP vent valveFuel tank pressure sensorEngine control module
What each part of P0496 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 96 | The exact fault in that area. |
What to do next
- Note P0496 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0496
What does P0496 mean?
P0496 means "EVAP System High Purge Flow". The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. It is a generic code, so it means the same on every make.
Is it safe to drive with P0496?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0496 fail an emissions test?
Yes, it can. P0496 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0496 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0496 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.