Skip the auto shop - Our mechanics make house calls

Q: P0443

asked by on

I have p0443 code just change purge valve selenoid my question is what else can triger that code

My car has 1980530 miles.
My car has an automatic transmission.

Hi there. A P0443 code will set when the evaporative emission system performs a self test and activates the purge valve to use engine vacuum to pull a vacuum on the tank for leak testing. When the engine computer does not see the fuel tank pressure lower, it sets the P0443 code. This can be a purge valve, as you have replaced, or it could be a wiring issue or a system leak. A sure sign that the valve is getting a signal is to listen and feel the valve during operation; it will cycle on and off and sound like a clicking sound. A leak to the tank will prevent a vacuum from being achieved. A leak can be anywhere from the vacuum hose at the intake to the purge valve to the fuel tank or a failing gas cap could be allowing fresh air into the tank through the filler neck. Note that small rodents have been known to chew into the hoses of the evaporative emission system creating leaks. YourMechanic has several available technicians to assist you with a check engine light inspection and provide an estimate and direction of repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Emergency brake locked up

This is a common problem for your vehicle. The emergency brakes in your vehicle are built into the rear calipers. Over time, corrosion will bind up the mechanism inside the caliper and will not allow the brake to release. The...

Q: Main relay, EMS1 fuses, and EMS2 fuses are missing. Do I need these parts?

Hi there. The codes are coming up for the camshaft position sensor, Oxygen sensor, EGR valve, and evaporative system not working. The fuses for EMS1 and EMS2 and the main relay vary depending on what Aveo model you have. If...

Q: Can I change gear ratio of my rearend if I also change the front

When it comes to a four wheel drive vehicle, it doesn't really matter what gears you use, as long as they match on the front and rear. So, if you wanted to switch to a 355 gear, that would be...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...