You wouldn't think a gas cap would be that important, but it is. When it's loose or cracked, fuel vapors leak out and can throw the whole fuel system off. This causes a reduction in gas mileage and increases emissions.
What causes it: If you get an error pointing to the gas cap it means fuel vapors are leaking out of your cap. This means the cap is either cracked or just wasn't tightened well enough.
What you should do: If your car isn't feeling jerky or strange when the check engine light comes on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.
SOURCE: 95 chrysler starts, runs for 5 seconds and shut off. Gauges don't work
As far as the running and shutting down you might try checking the EGR valve. however, this sounds like an electrical issue... a really weird one. You'll probably have to take it to a local shop that does well with electrical problems.
SOURCE: Check engine light comes on, car sputters, loses power
you need to change you crank shaft positioning censor
SOURCE: engine code 0456 ( evaportive emission control
It's a leak in your evap system. Causes: *Loose or missing fuel cap. *Evap canister broke, hose cracked or not connected. *Purge or vent solenoid defective *Vacuum leak at engine good luck
SOURCE: We bought a 2004 Chrysler Pacifica, it has 65,000
i had the same problem when i bought a 2004 pacifica with 44k for about the first year. the car never stalled or broke down, the problem eventually went away.
Evaporative Emission Control System Leak Detected (no purge flow
or large leak)
What does that mean?
This indicates a fuel vapor leak or lack of purge flow in the EVAP control
system. It means a large leak has been detected. The (EVAP) emission control
system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel
vapors are routed by hoses to a charcoal canister for storage. Later, when the
engine is running a purge control valve opens allowing intake vacuum to siphon
the fuel vapors into the engine.
Symptoms
You likely won't notice any drivability problems.
Causes
A code p0455 most likely means one or more of the following has happened:
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