What is happening is that the evaporative emission system is sensing a large leak.
Chevy impala gas cap problems.
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An improperly sealing fuel cap may cause an evap system leak which will set off the check engine light when the the computer detects the leak.
Learn about this problem why it occurs and how to fix it.
The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap.
Many drivers of impalas from every model year reported an illuminated check engine light due to a loose fitting gas cap.
Here are the most common things that are done to diagnose the code.
Then tighten the gas cap with your hand until you hear the cap click in place.
There is no sensor for a loose gas cap.
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Chevrolet impala check engine light due to gas cap issue 303 reports.
The mechanic will inspect the gas cap to make sure that it can handle pressure.
Solved the rough running engine and check engine light went off after a couple of days.
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Learn about this problem why it occurs and how to fix it.
If it does not click in place or is loose after clicking into place the cap needs to be replaced.
On a 2006 chevy impala it tells you to tighten the gas cap.
The computer sees this as the most probable cause is a loose gas cap depending on several factors it looks at.
Chevrolet malibu check engine light due to gas cap issue 248 reports.
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Gas cap problems a car s check engine light can come on for multiple reasons some more severe than others.
A mechanic has a wide range of instruments at his or her disposal to diagnose what would be causing the p0449 in your chevy impala.
Happened again and replaced the gas cap and no more problems.