Chevy Tahoe

What is Code po440?

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2010-11-16 14:11:51
2010-11-16 14:11:51

The code should be for a loose gas cap or a bad seal on the gas cap. I got the code one time for not replacing the gas cap after filling up at the gas station.

Also, keep in mind, that code P0440 wont fire until the gas tank is at least 15% empty. So if you fill it up, it will clear the code. When your tank is at 85% full, it will come back on again.

Sometimes the code fires due to a loose gas cap; other times there is a vacuum leak in the EVAP system or a malfunctioning charcoal canister, solenoid , etc in the system.

This is not a critical repair. Your vehicle should drive fine. But you should have it checked for leaks, etc.

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EVAP Emission control System Malfunction

P0440 = EVAP Emission Control System Malfunction.

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yes if it is obd2 96 is obd II. If it is running with a loose gas cap, it will set a large evaporative leak code- po440 I believe.

po440 = evap emissions control system malfunction po134 = 02 sensor ckt no activity ( bank 1 sensor 1 ) So saying that have you done anything to the car , tune up, accident, etc. po440 could be a vacuum hose broken or more serious. po134 is saying one of the o2 sensors is dead, could be bad , disconnected , fraid wire etc.

I found that the check engine light came on and with a code reader I read a PO440 which says "emissions controls system malfunction". I cleared the code and found that when I tried to get it inspected they said other things were not ready...ie-oxgen sensor, catalytic converter and emissions. They also said that you will have to drive for 100 or so miles to let the ECM register readings again. I kept clearing PO440 code but within 70-80 miles it would return. Same error code PO440. I was told by a mechanic that the evaporator cannister and valve was bad and it will have to be replaced. The labor alone would be over 700.00, the tank would have to be reomved and this was a very laborious job. I decided to go another route. I know I needed to get to the top of the tank. I began removing the carpet from the back of the firebird just in front of the trunk. I used a hacksaw and drill to get at the top left of the gas tank. I used a drill and moved very slowly, not to create any sparks, this was used to make sure I wasn't near any fuel lines. I then used a fine bladed hacksaw and cut into this area until I exposed the cannister. You will have to bend away the sheet metal, be careful the tin is very sharp. Once you have the cannister exposed, you will have to remove the electrical connector and the main hose clamp. Then pry off the hose and remove and replace the cannister. The cannister with electronic valve was 30.00 at GM dealer. I then cleared the code and drove for around 70-80 miles and then took it to be inspected.....it passed this time. By the way, the car was also running much smoother, idling better etc. There is another valve in front by the motor sitting on top of the intake, which I had already replaced earlier. It is easier to get to and it is just the electronic valve. This initially didn't solve the problem, which led me to believe it was the other one on top of the tank. This all ended up costing me 121.00 labor and a few cuts. 30.00 for cannister, 30.00 for the other purge control valve and a 4X4 door on my gas tank which I repaired with a piece of cardboard and duc tape. this was covered up by the carpet once all was finished.

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This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. 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.

PO440 means the computer has detected a leak in the evaporative emissions control system.Code P0440 could mean one or more of the following has happened:The gas cap is not installed or working properlyThe purge solenoid has failedThe canister is plugged and not working properlyPossible Solutions With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.Inspect the EVAP system for cuts/holes in tubes/hosesInspect for damaged or disconnected hoses around the Evap purge solenoidCheck and/or replace the sensorCheck and/or replace the purge valveHave a professional use a smoke machine to detect leaks

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