I''m getting P0440 DTC on an 01 Cav. 2.2. I replaced the part the I was told was not working and 300 miles later the same code pops up. It was a fuel solenoid on the back of the intake that was supposedly not working. Anything else that could be causing the prob.?
Chevrolet cav 2.2Already Tried: replacing part
Hello, and welcome to JA!! the code P0440 indicates a large leak in the evap system. this is normally checked with a smoke tool. most coomon failures is the gas cap loose or leaking, and the evap vent sol stuck open. also seen a few cases of the wiring harness to the vent sol either broken or rub thru somewhere. here is some info on this wiring problem.
The EVAP large leak test applies vacuum to the evaporative emission (EVAP) system and monitors vacuum decay. The powertrain control module (PCM) monitors the fuel tank pressure (FTP) sensor signal to determine the vacuum decay rate. At an appropriate time, the PCM turns the EVAP canister purge valve ON (open) and the EVAP vent valve ON (closed). This allows the engine to draw a vacuum on the EVAP system. At a calibrated time, or vacuum level, the PCM turns the purge valve OFF (closed), sealing the system, and monitors the FTP sensor input in order to determine EVAP system vacuum. If the system is unable to achieve the calibrated vacuum level, or the vacuum level decreases too rapidly, DTC P0440 will set.
: Service Engine Soon (SES) Light Illuminated, DTC P0440 Set (Replace Fuel Tank Evaporative Emissions Control System (EVAP) Vent Solenoid Harness) -
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.
Vent Solenoid Harness
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I just looked under the car and a wire is broke on one of the harnesses. thank you.
good deal, glad you found your problem.
Thanks for using JA!!!