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Super Mechanic
Super Mechanic, Master technician
Category: Chevy
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Experience:  29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
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2002 Chevy Cavalier: OBD code of P0440..Malfunction

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I have a 2002 Chevy Cavalier that just failed an emmissions inspection due to an OBD code of P0440-Evaporative Emission Control System Malfunction. Is there anyway to troubleshoot what is signaling this code without paying an arm and a leg for diagnositcs work?

Hello and welcome to Just, Super mechanic here. About your vehicle.


There has been a service bulletin isued for that code. I have run into this before, also the wires comming out of the connector. That would bethe first thing to check. Here is what the bulletin states.


Emissions - SES Lamp ON/DTC P0440 (EVAP) Set

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 02-06-04-044

Date: August, 2002


Service Engine Soon (SES) Light Illuminated, DTC P0440 Set (Replace Fuel Tank Evaporative Emissions Control System (EVAP) Vent Solenoid Harness)


2000-2002 Chevrolet Cavalier
2000-2002 Pontiac Sunfire



Some customers may comment that the SES light is/was illuminated.

A technician may find DTC P0440 is stored in the PCM.


The EVAP solenoid harness may be misrouted around the rear antilock brake (ABS) wire harness causing a chaff/damage to the EVAP vent solenoid harness, setting DTC P0440.


Follow the service procedure below to diagnose and correct this condition.

1.Install a Tech 2 scan tool and select the appropriate vehicle. Verify that a DTC P0440 is stored in the PCM.


2.Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID # XXXXX).




Locate and inspect the EVAP vent solenoid harness (3) routing. The harness may be routed below the ABS wiring harness (4) at the right rear corner of the fuel tank, causing stress on the EVAP solenoid harness (3).





4.Disconnect the EVAP vent solenoid harness (3) from the EVAP vent solenoid (2) and connector C313 (1). Discard the EVAP vent solenoid harness (3).


5.Connect the new EVAP vent solenoid harness (3), P/N 22687059, to the EVAP vent solenoid (2), route the harness above the rear ABS harness (4) and connect the EVAP vent solenoid harness (3) to connector C313 (1).


6.Lower the vehicle.


7.Clear the DTC's with the Tech 2 scan tool.



If all of the wires are good you will want to check for any leaks in the evap system.

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