Question about 1997 GMC Jimmy

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I just got a code po440 and I dot no where to start it seems like its harder to start the engine and it seems like I get a gas smell sometimes

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P0440 - Evaporative Emission Control System Malfunction

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.

Symptoms: You likely won't notice any drivability problems.

Causes: A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly

Possible 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/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks

Hope helps.

Posted on May 23, 2011

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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.

Posted on Jun 16, 2011

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If it's the code for a small evap leak, check the gas cap. If replacing use an OEM only cap. Don't reset the CEL. If that solve the problem the CEL will go away after a few quick trips. If that doesn't solve the issue, you have a leak somewhere in the evaporative system. You need a mechanic to do a smoke test to diagnose where the leak is. If it's the code for a large evap leak, do a smoke test

Posted on May 23, 2011

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I just got a code po440 and I dot no where to - 7_1_2011_9_22_02_am.jpg

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Posted on Jul 01, 2011

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Tighten gas cap

Posted on May 23, 2011

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Posted on Jan 02, 2017

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Po441 & po440 engine codes


Here is detailed info:

These codes tell you that there is a vaccuum leak.

Check your gas cap to see if it is tight, if it is, you should probably replace it as that will cause the codes to appear. Here is some more detailed information as well.

DTC P0440 is recorded by the ECM when evaporative emissions leak from the components within the dotted line in Fig. 1, or when the vapor pressure sensor malfunctions.

DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components within the dotted line in Fig. 1, or when there is a malfunction in either the VSV for EVAP, the VSV for pressure switching valve, or in the vapor pressure sensor itself.

Basically, the P0440 code is set when there is a vacuum leak in the system, at cold engine start the VSV is open and pulls the lines into a vacuum. Then the VSV closes and the vacuum should stay roughly at the same spot. If the pressure increases rapidly (aka loses vacuum) then the pressure sensor sees that and sets a DTC and turns on the MIL. From what I gather from P0441, the system doesn't pull into a vacuum.

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